Re: A call to chair sessions at SHARE
S Having had a (several) play with the scheduler toy, the only thing I can confidently say is I'm not much better placed to help. I have no time slots without a conflict of some sort. I (currently) have no slots in the Linux/VM stream where I will definitely be attending, despite there being several I badly want to. z/OS performance is where I make my income - z/VM is a side interest; and unfortunately not a very large one here in Aus Would like to help, but can't. Shane ... On Sat, Jun 15th, 2013 at 8:47 AM, I wrote: Ugh - now I remember why the various streams have so much trouble getting volunteers for chairs. It's not just that we are a bunch of lazy bums - it's a *real* problem trying to work out which sessions one can actually attend. And things might move - or I might change my mind ... ... If I ever work out what I'm going to in this stream, I'll be in touch. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: CPUPLUGD or VMRM-CMM or CMMA
I was never much enamoured with the original cpuplugd - and my customer response to testing it was less than enthusiastic. This, however, looks more interesting. Now to see if I can convince the customer to retest using it (R/H 6.4). Shane ... On Fri, Jun 28th, 2013 at 1:12 AM, Bruce Hayden wrote: A whitepaper was published about a year ago about the updates to cpuplugd. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: A call to chair sessions at SHARE
On Sat, Jun 15th, 2013 at 7:52 AM, Jagos, Brian V wrote: Hi All, It is that time of year again this is a call to chair SHARE session. Hadn't realised the schedule was out. Ugh - now I remember why the various streams have so much trouble getting volunteers for chairs. It's not just that we are a bunch of lazy bums - it'd a *real* problem trying to work out which sessions one can actually attend. And things might move - or I might change my mind ... I know it's harder for the organisers than it is for us, but it's still not easy. If I ever work out what I'm going to in this stream, I'll be in touch. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Z9 to Z114, Z/VM5.4 to Z/VM6.2 and moving Z/OS to a guest?
And just for completeness, I have a customer happily running 5.4 on a z114. I would go for 6.2 on the new box, but you'd have to think IBM would cane you something awful with licensing for running z/OS as guests. Needs must I suppose ... Shane ... On Tue, May 28th, 2013 at 8:09 PM, Feller, Paul wrote: I can answer #3. Yes z/VM 5.4 will run on a z114. We are running it on a z196 (big brother to z114), but we had to apply maintenance to z/VM 5.4. ... Hi list Looking for the way forward. Have a Z9 with 1 CP and 5 IFL's. Have 4 X Z/VM 5.4 LPARS with various versions of SUSE Linux running as guests and a Z/OS Prod and Test Lpar. Are installing a Z114 in a few weeks time and would like to upgrade to Z/VM 6.2 also Questions. 1) Is it easier to move the Z/VM 5.4 Lpars over with the Suse Guest's and then upgrade to Z/VM 6.2? Or should I install Z/VM 6.2 and then move the guests (Will keep all of the device address's the same on the new machine.) 2) According to IBM Z/OS 1.7 will not run natively in an LPAR on the Z114. We need to run it under Z/VM as a guest. Has anyone run into this problem? - Though I would create a separate Lpar with Z/VM and 2 X Z/OS guests (Prod an Test) 3) Does Z/VM 5.4 run on a Z114? -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Anyone have any good Debian media for a z9
I'm sure this will induce Philipp Kern to rise to the task. However a quick search on this list will also get you Fedora - that might suffice for educational purposes. Especially if you are RHEL inclined. CentOS used to do a s390x build, but I haven't seen that in years. Shane ... On Fri, May 24th, 2013 at 9:52 AM, Cameron Seay wrote: We are trying to install Debian for z on a z9 and are running into issues with the installation. Our media is coming from the Debian site. Does anyone have any media they have uses successfully or any tips. Red Hat will only give us a 180 eval copy for educational purposes and we want to use something else that we can use unfettered. Help! Long live REALLY open source software -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Big Dumps
On Fri, May 10th, 2013 at 2:32 AM, David Boyes wrote: You're probably not going to budge them on that. With luck maybe Filipe can bring some more clout to the table ;-) Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: oracle java
On Thu, Mar 21st, 2013 at 4:02 AM, Ben Duncan wrote: *SNARK* .. Gave up Java for Python. lol - I went the other way. No real loss in my case as my Python was rudimentary, and I wanted to write an app for my phone Now everyone tells me I should be on HTML5 d'oh. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Speed of BASH script vs. Python vs. Perl vs. compiled
On Thu, Jan 31st, 2013 at 12:44 AM, John McKown wrote: Thanks to all for the input! I _tried_ to run the script over night. I added an echo to tell me which input file I was working on. I came in this morning. It had been running from 14:00 to 06:30 (16 1/2 hours) and was still on the first input file. That ain't gonna cut it. Time to rethink. Using a Perl hash to contain an open file handle seems logical. As does buffering multiple records per output file to do a single I/O to write them. But I may be forced into using C or C++ for speed. Too bad I'm not a very good C programmer. Interesting timing. I was about to suggest you utilize your perl skills. Having originally ignored it, I now use awk extensively for text parsing/reduction. But for *BIG* jobs, perl is it. But all that input I/O is going to be death whatever you choose. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Your postings on Linux-390
I've had no trouble reading your mails from a (linux) mail client or a web interface to my ISP mail q. Using a web interface to linux-390, your messages disappear, leaving just attachments. Shane ... On Tue, Jan 29th, 2013 at 2:59 AM, Richard Troth wrote: friends -- Sincere apologies for blank messages and other strangeness and all this recent noise. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Convert partition table to GPT?
On Thu, Jan 10th, 2013 at 10:59 AM, Rick Troth wrote: GPT is s conspiracy of the partition police and the UEFI underworld. A little paranoia is good for the soul ... :-) Partition tables are needed ... sometimes ... not always. (One case where they are needed is when GRUB and UEFI gang up against the rest of us.) Hmm - maybe a little harsh on grub. We all have to tolerate the unreasonable demands of monopolistic multinational conglomerates. Probably every day for most of the people on this list. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: A call to chair
On Fri, Dec 21st, 2012 at 12:40 PM, Jagos, Brian V wrote: Yes SHARE is right around the corner and it is time for a call for CHAIRS. I am constantly baffled that the various streams appear to have so much trouble getting people to help on this. I can vouch that it ain't a tough gig, and you are guaranteed to get a spot near the front ;-) So if you're going, think about it. And no Brian, I won't be there ... sorry. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Still can't install on z196.
There is a thread on another list re why I love my z vendors. Clear evidence here. Excellent, pure and simple. Shane ... On Tue, Dec 4th, 2012 at 6:34 PM, Dan Horák wrote: yes, I've checked the sources for dracut (the tool that downloads the image after setting the needed devices online) and there is no way to set a proxy server. Please open a bug at https://bugzilla.redhat.com (product Fedora, compoment dracut) asking for this capability and let me know the bug number. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: VNC for RHEL 6
Mark Post (from Suse) spake thus: RHEL ships with tigervnc (the client) and tigervnc-server. Is there some problem with those? Who says they don't keep an eye on their contemporaries ... :0) Keep up the good work, one and all. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: xcat?
Might explain the quality of the doco - kudos as appropriate. Shane ... On Sat, Sep 1st, 2012 at 10:07 PM, Thang Pham wrote: As of July 13, 2012, a service contract for xCAT on z/VM is available for purchase from IBM. More info is available on http://www.vm.ibm.com/sysman/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: console-kit-daemon errors on SLES 11
As per the document one can modify the the syslog-ng.conf file to supress the messages. React to the symptom (and hide the evidence) rather than fix the actual problem. Has happened before, will do again. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: xcat?
On Sat, Sep 1st, 2012 at 1:17 AM, Lee Stewart wrote:
Is anyone using xcat (http://xcat.sourceforge.net/) in production? Any
comments on it?
Nope, but thanks for asking the question. Looks interesting.
My only comment would be that the z{VM,Linux} doco looks extremely well done.
Shane ...
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Re: Too true to be funny - 51% of the surveyed Americans think that stormy weather can interfere with the functionality of the cloud.
And ... ?. http://gigaom.com/cloud/some-of-amazon-web-services-are-down-again/ Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Collectl - open-source Linux performance monitor
From a non-z perspective it is excellent. It's all (??? - the bits I've looked at anyway) perl, has a daemon mode that creates a detailed history, and is fine-grained in the data. Mark, the developer, is very receptive to suggestions. Must see if I can get it on a (z) customer site somewhere. Shane ... On Sat, Aug 18th, 2012 at 6:15 AM, Morris, Kevin J. (RET-DAY) wrote: Has anyone on this list experimented with Collectl and its accompanying utilities? http://collectl.sourceforge.net/ http://collectl-utils.sourceforge.net/ For those without access to Velocity Software, this may be the next best thing... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: z/Linux and z/OS
Seems this is a common refrain in this neck of the woods. Lots of blue-sky stories, then little or no engagement. There are (significant) successes, of which there are a few people subscribed here, but there are also a number that are (deliberately) unpublicised. Very unfortunate. zLinux in Aus appears to the watching masses to be the promising child that just never lived up to expectations. Shane ... (Tony, can you change your reply to pls) On Wed, Aug 1st, 2012 at 8:48 AM, Tony Saul wrote: I'm probably just jealous and frustrated when I see success stories as I have been bashing my head against a brick wall for so long. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Hipersockets over Guest LAN to MVS
On Tue, Jul 17th, 2012 at 6:37 AM, Alan Altmark wrote: ... TCPIP is connected to two HiperSocket networks: one real (to MVS) and one virtual (to Linux). Now, hold it right there fella. I want the order number for one of those *real* hipersockets. (haven't we been here before ... ;-) Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: MIPS increase after SLES11 SP1 patches
It should be noted top accepts a parm to adjust the report frequency - all the way down to fractions of a second. *All* sampling based monitors have their weaknesses - especially those that run in userspace. However, for those of us that developed our performance tuning/debugging skills in a traditional one-make proprietary environment the tools/metrics available in Linux are generally seen to be somewhat lacking. I am in the process of preparing a presentation on such for submission for the next LCA - whether it fits the theme the organisers decide upon, let alone gets accepted at all remains to be seen. Shane ... On Thu, May 3rd, 2012 at 2:48 PM, Srivastava, Sagarwrote: ... Standard Linux commands like top could not show the process since it ran for 10 seconds per minute only. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Kernel ring buffer date stams missing
Be careful what you ask for. This is _not_ a true (time-of-day) timestamp. At least it wasn't last I looked. Think kernel active time since boot - useful for relative (timed) occurrences for kernel events. It would be reasonably trivial to adjust it to a ToD stamp, but it's going to have some holes in it. Shane ... On Sat, Apr 21st, 2012 at 6:28 PM, R P Herrold wrote: Not just a hint -- the Red Hat kernel configuration appears not to enable it -- but it may be trivially turned on: # echo 1 /sys/module/printk/parameters/printk_time -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: pid swap space used
On Fri, Apr 13th, 2012 at 3:41 PM, Mark Post wrote: /proc/*/smaps exists in SLES10, but there's no Swap: fields in them. Arrgggh. That'll certainly get a bunch of zeroes out of that script. Note to self, _never_ presume nuthin ... Thanks Mark. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: pid swap space used
No, by lazy in this context I meant that freed memory (pages) are not immediately moved to the free list. This even extends to task termination. If memory pressure ramps up sufficiently, kswapd will get kicked to balance out the trees. Could take a while - like forever. In addition to what Rob mentioned, there is de-dup and compressed swap cache out in the wild already. How does the mug end user figure out what's what ?. Shane ... On Thu, Apr 12th, 2012 at 5:56 PM, Rob van der Heij rvdh...@gmail.com wrote: ... (assume Shane hints at that with lazy). -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: pid swap space used
On Thu, Apr 12th, 2012 at 8:37 PM, Rob van der Heij wrote: With 22 processes having this mapped, I would count it as 22 times 8 kB while it really is just 8 kB on swap? And how come part of this is private when it's read-only? Note the last sentence of my previous post. That applies (particularly) to myself. The memory metrics are interesting in a number of ways. For shared libraries the memory (swap in this case) appears to replicated, but not additive. This was a burr in the saddle for so many people they eventually invented PSS to try and apportion responsibility for RSS - that's your ratio based on reference count (I think). Don't try to apply logic to it. As for the private- it's *all private. That's what the p permission flag is - indicates cow. My question would be what has changed to force an anonymous allocation ?. And who was responsible, given that your referenced allocation is zero ?. Hopefully one of the bright folks in the German labs will come to our aid whilst I sleep ... ;-) Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: pid swap space used
- obvious first step would be to check the entire system, rather than a
subset you obviously think is the cause.
- smaps should be believed.
- Linux uses lazy (memory) allocation. This includes de-allocation. And swap.
Hence the various tools that simply read meminfo should be treated with
(extreme) care if you are basing decisions on it.
- the definitive way to check is swapoff/swapon. Bit drastic maybe, but the
swapoff will simply fail if there is insufficient memory available. Works
o.k. on test environments ...
Shane ...
On Thu, Apr 12th, 2012 at 12:09 PM, PHILIP TULLY wrote:
I have a couple servers which show 100% swap space used but when I look
I can't find which pids are have pages in swap.
free -m
total used free sharedbuffers
cached
Mem: 12061 11410650 0152
6425
-/+ buffers/cache: 4832 7228
Swap: 1129 1128 1
I was using the following to show how much swap space was being used it
is either not working or there is nothing allocated to swap.
for pid in `ps -ef|grep ora| awk '{print $2}'`; do echo -n Pid: $pid
; cat /proc/$pid/smaps |grep -i swap| awk '{SUM += $2} END {print SUM:
SUM kB ( SUM/1024 MB)}'; done
Does anyone have a different method for finding which pids are actually
using swap?
TIA
Phil
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Re: zLinux guest cpu question
On Thu, Apr 5th, 2012 at 6:06 PM, Lu GL Gao wrote: We know that linux cpu usage mainly include user cpu and sys cpu. But why performance toolkit value cannot corresponding with top command value? heresy Why not indeed. Hipervisors are becoming a commodity item. IBM (and its ISVs) has fought rear-guard actions on (costly) proprietary options in the past. And lost. Anyone remember SNA ?. Token-ring ?. Maybe IBM were ahead of their time with VIF - time for a resurrection maybe ?. Instead of trying to force users to conform to z/VM, maybe the powers that be should be looking to contribute useful metrics upstream, and merely make z/VM a generic hipervisor so users can concentrate on the things that earn them a buck. Or just toss it all in and get the z KVM module up to spec. /heresy Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: zLinux guest cpu question
Sorry Alan - I trust your paroxysm of coughing did no lasting damage ;-) I meant the concept, not necessarily that precise implementation. Shane ... On Sat, Apr 7th, 2012 at 3:22 AM, Alan Altmark wrote: (cough) With VIF, we learned an important lesson on how NOT to make a hypervisor. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: New book: Linux Health Checker 1.0 User's Guide
And is already linked off the sourceforge page. Excellent work !. Shane ... On Wed, Mar 21st, 2012 at 9:25 PM, Dorothea Matthaeus wrote: The Linux Health Checker User's Guide will soon be available also on developerWorks. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: New book: Linux Health Checker 1.0 User's Guide
C'mon Mark, be a bit more positive lol. Let's hope Barbara doesn't get to hear of this (*) ... ;-) Shane ... (*) - apologies to those not on IBM-MAIN On Thu, Mar 22nd, 2012 at 2:25 AM, Mark Post wrote: I'm more interested in a mechanism to report bugs. From perusing the SourceForge pages for the project, it appears the only open avenue at the moment is to subscribe to their mailing list. :( -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: RES: Emergency
It doesn't matter much - all the important meta-data is at the front and gets clobbered first. Usually. LVM is greatly lauded as an Enterprise solution, but the initial design was terribly flawed, and numerous iterations to rectify it have not been entirely fruitful. IMHO of course. Even if only a subset of the devices has been trashed, just getting LVM back to a usable state can be a devil of a job. Without (decent) backups any overwritten data is gone. Shane ... On Tue, Mar 20th, 2012 at 8:42 AM, Helio Mario Neves Pimentel de Oliveira wrote: I don´t how far the formatting exec went, before the machine hanging. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Cannot add drive to existing LVM SLES 11 SP 1
This is just your friendly vendor messing with you. Not to mention LVM itself. An lv is not a volume, it's really a partition - no, wait, that's what a pv is ... Unless, of course, a pv is a full volume, and not a partition at all. And a vg is a group of volumes except when a pv is not a partition, but a volume, which makes the vg a group of ... never mind :eek:. Overloaded acronyms are always lots of fun. Shane ... On Thu, Mar 15th, 2012 at 9:11 AM, Tom Duerbusch wrote: Just have to know the secret handshake and all is well G. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Oracle in virtual environments
C'mon Rodger, stop beating around the bush - say what you really mean ;-) Whenever I've sat in on any presentations by database developers , they *always* want all the memory, to do their own (direct) I/O, avoid O/S services (like caching) and to hell with the rest of the users of system services. Linus (as is his want) has also reacted (er, ranted) about this anti-social behaviour. Some days it is just a whole lota fun being amongst the spectators. Shane ... On Mon, Feb 27th, 2012 at 11:10 AM, Rodger Donaldson wrote: Given Oracle's own support matrix says they officially support not just zVM but OracleVM for Intel (i.e. rebranded Red Hat Linux), OracleVM for SPARC (SPARC T-series domains), Solaris containers, and M-series domains, I would be tempted to ask your DBAs if they're just lazy or actually too incompetant to read the documentation on the product they're being paid to support. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: LVM mount points
I must admit some ambivalence to being hamstrung by such standards. I did enjoy having a read of this: http://lists.busybox.net/pipermail/busybox/2010-December/074114.html Shane ... ... The default in /opt/IBM is not a great option. Per the FHS, I believe it should have been (should be) /var/opt/IBM/. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: ksoftirqd using 100% CPU
On Fri, Feb 10th, 2012 at 11:00 PM, Joerg Reuter wrote: On Thu, Feb 09, 2012 at 04:43:25PM -0600, Ron Foster at Baldor-IS wrote: The only messages I can find have to do with a hipersockets time out. Feb 9 11:21:39 bus0104 kernel: NETDEV WATCHDOG: hsi0: transmit timed out Feb 9 11:21:39 bus0104 kernel: qeth: Recovery of device 0.0.5100 started ... Hmm, that shouldn't happen. Lol ... I was wondering if the OP could see anything from z/VM, but if it really is a softirq/tasklet problem that probably means (Linux) dodgy driver. And in almost all occasions that probably means network ... Keeping an eye on /proc/interrupts might be instructive. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Undeleting files
On Wed, 14 Dec 2011 16:00:52 -0600 Tom Duerbusch duerbus...@stlouiscity.com wrote: Instead of copying the files, I thought syncing the directories would be easier. Well, I synced an empty directory to the Linux directory. All files are gone. I did some non-z testing a while back where I managed to recover an ext3 filesystem that had been quick formatted as NTFS. Seems home users do that a bit. For a newly created (ext3) filesystem that had a few files copied to it and then formatted - so managed test, not real world - mkfs.ext3 -S ... enabled all the files to be found by name and recovered. Note also the caveats in the manpage. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Porting old application- numeric keypad
On Wed, 14 Dec 2011 18:34:45 -0500 Smith, Ann (ISD, IT) wrote: I do have another question for folks They seemed to have used the dircmp command a lot - in particular 'dircmp -d' It appears that linux distro does not have dircmp Trying to find an equivalent for SLES10 diff -r dir1 dir2 If you only want the filenames use -q as well. In need delete the Only in ... lines with something like sed or awk. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Question of UTC vs Local Time
On Tue, 29 Nov 2011 13:04:55 -0600 McKown, John wrote: One is to simply wait for n hours for the GMT version of the TOD clock to move forward from the local TOD clock time (US EST would be a 5 hour wait). This is not likely to go over well with management. grin. - We looked at this (in a z/OS not zLinux context) a few years back - n in this case was 10. No-go; even looked at 2 or 3 smaller jumps. All too hard. Not much later the site took a significant outage - redundant power feeds to a DASD controller were found not to be. Several hours later it all came back online. If only we could co-ordinate these things ;-) Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: mvsdasd
On Wed, Nov 9th, 2011 at 3:44 PM, Alan Altmark wrote: Just because the current crop of security weebles don't get it does not a true problem make. Eh? LOL. Should it come to pass that Alan and I are once again in the same bar imbibing the best of Aussie brews/wine, I must remember to remind him of the time he was accused of being a (security) weebie (which I just had to look up to assuage my ignorance). :-) Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Odd swap space behavior
On Wed, 2 Nov 2011 11:29:40 -0400 Richard Troth wrote: So what you're seeing is random pages which got pushed out at various times during the stress period. If not needed, they will sit there forever. Well, maybe not forever ... ;-) This lazy (de-)allocation behaviour of Linux is worth remembering. It's just too expensive to continually run the q's to clean this up. Later kernels expose the per-pid (actual) swap usage - I haven't figured out if there is yet a reliable means of discerning disk vs. cache swap usage. I like to differentiate between swap occupancy and swap movement. The occupancy doesn't really hurt you in terms of response time. Most of the time. If memory pressure ramps up *really* quickly, kswapd gets kicked into action to run the q's to free up pages. And it can cycle back through chasing enough memory to free. Not likely in this scenario, but if kswapd needs to work, you wait. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Install tape driver error on zlinux
On Tue, 18 Oct 2011 11:41:47 +0200 Steffen Maier wrote: Since you (had to) build the lin_tape device driver kernel module yourself it is formally flagged as not supported by SLES11 and therefore modprobe denies loading the module. I wonder how this sits philosophically with users. At least they didn't mark it as crap I suppose (see https://lkml.org/lkml/2011/10/6/317) Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Install tape driver error on zlinux
On Tue, 18 Oct 2011 13:51:37 -0600 Mark Post wrote: If the OP _has_ to use lin_tape for whatever reason, he needs to understand that running with a tainted kernel _might_ put some additional burden on him in the future. Is this not GPL licensed code ?. If so, just how does running it result in a tainted kernel ?. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: dasd_configure doesn't see partition 1 on RO disk
This just has to be disaster waiting to happen - as per the initial post. Detach/attach is the only time Linux forces a re-read of the data actually on the disk for the R/O systems, so you need to sync on the R/W system, then detach/attach on the R/O systems to pick up the actual changes. And don't be too keen to rush over and do the attach. [f]sync (in general) _doesn't_ force the changed data to disk - it merely schedules the I/O. Big difference. Yes, but it's smart enough to allow journals to be turned off and on with commands. This is also true of ext[34]. XFS may well offer other benefits as David alludes. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: z/VM 6.2 ?
On Wed, 12 Oct 2011 11:03:16 -0400 Jim Elliott wrote: Shane: The z/VM 6.2 stuff went live on the www.vm.ibm.com at 10:00AM ET today. The rest of the System z updates went live earlier in the day. Thanks Jim et al, I actually found the under construction page for 6.2 just after I posted. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: IHS WAS throughput query
On Tue, 11 Oct 2011 08:35:18 +1300 Rodger Donaldson wrote: ... it's probably a Java problem. *probably* - did you say probably ... ROTFLMAO. Shane ... (BTW, just noticed, you need to change your Reply to ..) -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Newbie question on lvm
On Wed, 5 Oct 2011 23:24:24 -0600 Mark Post wrote: It is still needed on SLES10 systems, which is what the OP was running. In which case I apologise for being misleading. Shane ... exits stage left biting tongue ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Newbie question on lvm
resize2fs has been the supported (online) tool for a _very_ long time. If you can conveniently get the lv unmounted and feel more comfortable, by all means do so, but is unnecessary. Backups, thems is necessary - any time you're screwing with your data, not just on resizing. But I (slightly) digress. Shane ... On Wed, 5 Oct 2011 23:31:35 + Davis, Scott wrote: No, LV shows the space. When I use ext2online dmesg shows -- JBD: ext2online wants too many credits (1034 1024) Google results say it's a bug. I will use resize2fs un-mounted. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Redhat trying to patent netboot?
On Sat, 1 Oct 2011 10:42:12 +0200
Philipp Kern pk...@debian.org wrote:
I, for one, would prefer companies with a good track record of
commitment to the open source world hoover up dumb patents and leave
them sitting idle rather than Apple getting hold of them and
launching another one of their efforts to stop anyone else making
GUIs, smartphones, or whatever.
and then getting buyed by some evil corporation who uses the patents
against everyone else? (C.f. Sun and Oracle.) It's not that Sun was
particularly hostile to open source.
I shouldn't get involved in this - I will probably piss {some,every}one
off big time.
What the hell ...
Long ago I looked at buying a Lisa - but I wanted to upgrade it.
Like Apples fscked up business model would allow that ... never bought
Apple, never will.
And who amongst you believe Larry Ellison has *your* interests at heart ?.
CPTN Holdings maybe ... ?
Redhat ... ?
Ubuntu ... ?
Sorry, the times of innocence have passed.
Shane ...
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Re: System Load and it's indigrents/meaning definition
On Wed, 28 Sep 2011 10:18:55 +0200 Rob van der Heij wrote: Including the D in the count as competing for CPU resources is motivated by the assumption they will soon be R again. Which is all fine *if* everyone plays by the rules. Short-lived D is fine - say from an interrupt handler like it was (presumably) designed for. Unfortunately it got loose in the developer world. If code marks a thread as uninterruptible sleep, it is exactly that. It accepts no signal *at all*. And unlike zombies, they never get reaped if the mother task goes away. Imagine a sysadmin rings and says his Bozo AG system (which run all of Prod) has just stopped and issued a message saying the loadavg is above (say) 250% of the number of engines. Running tasks - 2; engines 4; loadavg 11; CPU% ~0 !!!. U. Add a couple of virtual CPs gets the ratio down but what do you do when in 2 hours time the loadavg is 20, then later 100 ?. This is just a terrible metric to base decisions on. A re-boot is required to clear a situation like the above - and it happens. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: System Load and it's indigrents/meaning definition
On Tue, 27 Sep 2011 19:44:02 +0200 Rob van der Heij wrote: The probably refer to load average which is the number of processes that run or would be able to run. The easy math is that for an N-way guest, the load average larger than N means that processes wait to get CPU resources. Since CPU resources are often the most expensive part, it's good to wait for CPU rather than something else. If your load average is lower than N, there's no CPU waiting as far as Linux is concerned. Note that this is the *Unix* definition of loadavg - not the Linux definition. Unfortunately one of those of old saws that has been handed down through the generations. Software designers have been known to use this metric to (dynamically) limit connections to their software - database for example. Bad idea. Mark gave the correct definition. Note that processes in uninterruptible sleep (state D) comprise more than just those waiting on (disk) I/O to complete as is commonly asumed. HTTP servers parking threads as D then forgetting about them is not unknown. Makes an awful mess of the loadavg - and any software using the metric incorrectly. Mind you, it's hard to think of ways to use it correctly ... Almost as meaningless is %wa. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Window question
Windoze provides help cmd for a subset of commands. If that fails try cmd /?. Should work for dir. I can't count the number of times I've used ls (out of habit) on Windoze systems :( Shane ... On Mon, 26 Sep 2011 17:53:45 -0400 Eddie Chen wrote: I need a recursive list of sub-directories under the Z drive. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: HugePage support with RHEL
On Fri, 2 Sep 2011 09:54:31 -0500 Stephen Frazier wrote: Looking at IBM past support for new hardware in guests of z/VM, I would suggest that it will be supported in z/VM 7.1 or before. Look for edat facility support to be added in a as yet unannounced point release of z/VM 6.?. Also, IBM probably will not talk about it until they are ready to announce it. Maybe it's my jaundiced eye, but I have a different perspective on this. IBM are the proprietary (monopoly ?) supplier of both the hardware and the software (in the case of z/VM). So you can't tell me they don't know what's in the future product. Why isn't support there day one ?. Look how long it took for CP 32-bit storage constraint relief to make it out the door - how about STP support ?. z/OS knows all about (non-virtualized) big page support - and Martin and his mates were able to fudge it *in the guest*. This is hipervisor responsibility. Maybe if/when live guest relocation makes it out the door, such features will suddenly become worthwhile investing developer time in. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Is MVS TRSMAIN (terse) available for zLinux?
Have you considered alternatives - pax for example ?. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Poor man's top
Doesn't do everything top does - but does show the 'top cpu users'. But it is showing a _different_ 'top cpu users' top is typically used to show an interactive instantaneous view (FSVO instantaneous), not an accumulated view since process start. Be aware of what you (actually) asked to see, versus what you think you're seeing. I might be inclined to reduce the clutter in the offered solution; say -o pid,pcpu,comm. I also wonder how many shops habitually run top with -d 10 - might ameliorate the perceived cost of running it. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: is ext4 ready for production use?
On Mon, 27 Jun 2011 10:15:40 -0700 Donald Russell wrote: I'm about to build some new RHEL 5.6 systems on zVM 6.1 the old servers use ext3 file systems, but I have the option to use ext4. Is ext4 ready for production use, or is it still rather experimental. I would posit that ext4 long ago moved out of experimental. Not sure of the status as regards (s390) RHEL 5.6 though. There were some issues initially where Ted decided to fix some errant (from his perspective) behaviour in ext3. Unfortunately some developers had taken advantage of that behaviour and the change broke user filesystems. Linus went off his tree at that, so it was un-fixed ... ;-) Speaking to Ted at a conference a couple of years back, he saw ext4 as a logical progression of ext3, but more as a step along the journey to something better. He nominated btrfs as the successor. ext4 is more attuned to large filesystems - have a read of the following for a reasonable overview. http://kernelnewbies.org/Ext4 Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: LVM on CKD?
On Thu, Jun 9th, 2011 at 6:12 AM, Mark Post wrote: To be honest, I don't think LVM itself cares about the partition type. pvcreate will use any partition you point it at. This is unfortunately (almost unbelievably) true - with the notable exception of swap. Regardless of the partition type of a swap extent, pvcreate recognises the swap header and will query you before trashing it. Any other partition type - including those with valid filesystems and data - will be fair game. Shane ... (N.B. - not (re-)verified on z/) -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: SwapCache
On Thu, 2 Jun 2011 05:43:14 -0700 Dave Czajkowski wrote: Is there a way to disable or limit the amount of SwapCache? I understand it's function, but the double allocation of these pages is causing my low memory alerts to trip. This would imply to me that your triggers are poorly set. Would you care to expand on the double allocation of these pages ?. My understanding is that the swap-cache is merely a different state of pages in the page-cache. I can remove the swap copy with a swapoff/swapon. Is there a more elegant way to remove? Not that I've found. Past discussions on LKML have elicited little (no) sympathy for including controls for specific memory controls. Perhaps Allan Cox will pass by again and offer an opinion. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: cmsfs-fuse package in RHEL 6.1
H - and why isn't this generally available ?. Open source ... ??? Not meaning to piss on the messenger, but I'm happy to do likewise to the policy makers involved. This is just *bad*. Put it out there, let the community benefit. Having been the recipient of IBMs progression to OCO, this just rubs me the wrong way. Shane ... Just an fyi for anyone interested in cmsfs. cmsfs-fuse is a new feature included in RHEL 6.1 (released last week) which allows write access to a CMS filesystem. For example, it's now possible to edit files on a guest's 191 disk with a Linux text editor like 'vi'. It's contained in the package 's390utils-cmsfs-fuse', but you won't find it in the normal channels for download with RHEL 6.1 on http://access.redhat.com. Instead, it's in the 'optional' channel for 6.1. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: cmsfs-fuse package in RHEL 6.1
... which allows write access to a CMS filesystem. Note the *write* access - is this generally available ?. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: SSH X connection to z/Linux from Android?
Hard to argue ... lol Shane ... On Fri, Apr 1st, 2011 at 10:15 PM, Mauro Souza wrote: But anything is better than twm. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
And which real address 0 might that be ?. Remembering that most people will be running as a guest under a hipervisor (z/VM) running second level under another hipervisor (PR/SM). I note our German maintainers have been conspicuously quiet Shane ... On Thu, Mar 17th, 2011 at 6:32 AM, Mark Post wrote: Is there a way to tell externally (command or otherwise) where the zLinux kernel is loaded in memory? It gets loaded at real address 0. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
As Rob pointed out, good luck trying to figure what that actually resolves to hardware-wise. Shane ... On Thu, Mar 17th, 2011 at 8:46 PM, Heiko Carstens wrote: The kernel gets loaded to address absolute zero ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
And another good thread was had by all. Whilst I suspect the initial question was in no way related to the problem observed, the asking elucidated some fine information on the zSeries port for those of us with a morbid fascination in such matters. Thanks to all. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: cleaning up /tmp
I've been known to drop files in /tmp for later collection - by myself or others. Have you considered skulker ?. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: cleaning up /tmp
Just to clarify, this was based on the OE reference - i.e Unix Systems Services running under z/OS rather than zLinux. Shane ... On Sat, Mar 12th, 2011 at 1:44 AM, I wrote: Have you considered skulker ?. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Spiking server
My perspective on this is that swap is there to soak up allocations you weren't prepared for. Who cares about the cost of (virtual) disk allocation. As for Rob (who works for someone that sells software monitors) beating up on someone who works for the hardware vendor ... ??? Chill fella ... just chill. Chewing up all the (guest) memory, then doing likewise to the z/VM memory (extended included) can't be good. Especially if it all finally goes base over apex as the OP indicated. Swap is generally cheap - outages are expensive ... As are the arse-kicking episodes afterwards. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Convert filesystems now or wait for SLES1x?
On Mon, 21 Feb 2011 23:54:53 -0700 Mark Post mp...@novell.com wrote: On 2/22/2011 at 01:42 AM, Leland Lucius lluc...@homerow.net wrote: Up til now we've used Reiser and would convert to ext3 as part of the rebuilds. But, should we leave all of this until the next upgrade? Will the next recommendation be btrfs or ext4? Will they still be too new to bet the house on? I would wait until a system gets replaced or upgraded. I doubt very much that ext4 will ever be a SUSE Linux standard. btrfs might be, but not in the short term, and certainly not for SLES11. SLES12 would be the earliest, if at all. Interesting - ext4 has been stable for quite a while now. Whilst even Ted (the maintainer) describes it as an interim step on the road to btrfs, I must admit to being surprised SLES11 didn't run with it as the default f/s. btrfs has some beaut features (especially if you have to shout down Solaris/ZFS bigots), but it ain't ready for prod yet. Close tho' ... Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: LVM, PAVs, and cloning
You wish You'll find them scattered hither and yon - especiallly with LVM faking a(nother) block device layer. And, as you've already discovered, the second U is a lie. Sometimes ... Shane ... On Wed, Feb 2nd, 2011 at 10:48 AM, Alan Altmark wrote: Ah, so these UUIDs are not the builtin UUIDs of the DASD devices? E.g. IBM.3390.274.04E kinds of things. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Linux preferences
And as a dispassionate (database ignorant) observer, I'm happy to see such a response from a vendor. Top points. Shane ... On Wed, Dec 22nd, 2010 at 10:17 PM, Damian Gallagher wrote: The Oracle DBA indicates that Oracle is easier to implement under Red Hat - I'm interested in what this means precisely, as we should be pretty similar in each environment - we only have the one code set and installer. If there are significant differences that people are finding (on Z) then I'm happy to look into it. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Need a little help with a Linux script
On Thu, 9 Dec 2010 09:57:55 +0100 Agblad Tore wrote: I would say: don't use script for monitoring cpu. You may not get the correct cpu figures from inside the Linux and these cmds in scripts consumes huge cpu and I/O !! I can't see where parsing the output from mpstat would universally qualify for this admonition. Your bad experience is yours, not everyone elses. Do it in z/VM and a nice Rexx instead, much better ! This may well be true for something like overall CPU usage of the entire guest - bit hard to determine userspace usage from the hipervisor though. Probably also presumes the availability of a monitor product of some sort on z/VM. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Need a little help with a Linux script
awk (particularly GNU awk) is as flexible as your would generally require. If you use it's capabilities you could save a lot of seemingly redundant re-processing of the data. I might be inclined to feed the mpstat straight into the read loop and mangle it all with one awk call (per line). No grep, cut - even the echo could probably go if you get a little creative. Each to their own. Shane ... On Wed, 8 Dec 2010 17:21:53 -0500 Bauer, Bobby wrote: Thanks but since I'm not familiar with perl I'll stick with awk. I'll look at skipping the grep stage. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Red Hat Enterprise Linux 6 - installing problems
I have to say that I find doing Herc installs under Linux *s* much easier. Including Linux hosting of any ancillary services - like nfs. Especially if (like me) you just want it done - use something like Ubuntu; it'll punch the appropriate holes in iptables so you can actually share the data. Fedora is a PITA - you have to assign specific (i.e. non-random) ports, then open them up. All too much trouble - what the hell is the package manager (*not*) doing during the install ?. Back to your regular programming ... Shane ... On Sun, 5 Dec 2010 22:40:39 -0500 Alan Altmark wrote: Actually, the problem is not the file structure, but Windows XP itself. Windows Vista is the first version of Windows to include support for symbolic links in NTFS. Hopefully MS added the support to the CD/DVD drivers as well. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Announcing Red Hat Enterprise Linux 6
Hopefully you are talking about the Beta. I managed to get both the base and Workstation working under Herc - the latter was a smoother install IIRC. Unfortunately we are in the process of moving to a smaller office - I fear both those machines were deemed excess to requirements. If I get bored watching the (cricket) test over the weekend I might try an install at home. Shane ... On Fri, 26 Nov 2010 10:14:40 +1100 Bern VK2KAD vk2...@hotmail.com wrote: Has anyone been able to install RHEL6 under Hercules ??? - I could use some help. I have been able to IPL from the card reader but I am stumped with the network setup and as such can't establish a SSH session. Sample of something that works would be much appreciated. B. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Problems with DASD driver on SLES 11 SP1?
dd is _the_ absolute worst option for backups. It is stupid, has no concept of data integrity, and is stupid. And the default conv options are appalling - and it's stunningly stupid. Great for image copies in failure/forensic situations, other than that it's downright ... er, see above. [f]sync doesn't really help a lot in this situation either - from a Linux perspective. Last I looked (on a non-z system), fsync doesn't guarantee the (physical) I/O actually gets written then-and-there. Linux has I/O schedulers in play, and then there is pdflush/BDI to worry about waking up. Sometime, somewhere the I/O does get flushed. Blktrace has been around for a while now - the (timimg) output makes for interesting reading. Then we have z/VM snoozing away in the corner ... Sebastian and his cohorts can fill you in there. If it (ever) worked you were IMHO lucky. I'd be slipping some (long) sleeps in your scripts. Shane ... On Tue, 23 Nov 2010 10:51:53 +0100 Sebastian Ott wrote: 2. Problem: Because I lack the FLASHCOPY function I use for disk to disk copy dd. dd bs=4096 if=/dev/dasdx of=/dev/dasdy In principle it works ok. But when I do a chccwdev -d 0.0. even with an udevadm settle --timeout=20 afterwards, the file system gets corrupted, when I attach it to another guest. I am really lost since all that was working well under SLES 10 SP2. I would really like to know if someone had similar experience in SLES 11 SP1. The data is not guaranteed to be written in this case. This is due to changes in the linux block layer (it was not guaranteed to be written in sles 10 either but worked by chance). You have 2 options here: * tell dd to sync its data (check the man page - i think the option is fsync) * manually run sync after dd returns -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: HCPGIR450W and HCPGIR453W after editing user direct
Thanks Alan and Berry and everyone else who responded. Alan this wasn't my intent. When I said immediately I meant immediately upon receiving the (guest) IPL interrupt. And I agree with Berry - dynamic changes can (and should) be carried forward. Changes to what I called the z/VM environment - like USER DIRECT- I reckon can (and should) be reflected back to the guest, and implemented *at that IPL*. Obviously I'm out in left field on this, but I'll keep Alans pronouncement to logout in such cases in mind in future. Thanks again ... Shane On Fri, 5 Nov 2010 10:15:08 -0400 Alan Altmark wrote: It would be a Bad Thing if changing the directory changed a running virtual server. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: HCPGIR450W and HCPGIR453W after editing user direct
Alan, for those of us that stumbled from the real (FSVO real) world into the rabbit hole that is z/VM, are admonishments such as this inscribed in stone anywhere ?. Where I came from IPL clears up everything - this is not something I would have inherently expected. I can (now) see the logic, but it ain't in your face obvious. Shane ... On Thu, 4 Nov 2010 20:56:53 -0400 Alan Altmark wrote: ... you will want to LOGOFF the guest and LOGON again to pick up the directory changes. IPL of a guest is not sufficient to pick up a directory change. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Fedora 14 on System Z alive and kicking!
Decided I should finally have a look at this. Performance is (remarkedly) acceptable on my 1.7 GHz Pentium M (sub-)laptop. Takes a while to fire up, but that's o.k. Isn't your average build of course ... ;0) Shane ... On Tue, 28 Sep 2010 17:14:23 +0200 Karsten Hopp wrote: Hercules images and instructions on how to run that or how to install it yourself can be downloaded from -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: zSeries multibook query
Thanks Heiko, much appreciated. Shane ... On Wed, 6 Oct 2010 10:24:00 +0200 Heiko Carstens wrote: Or in other words: Linux is not aware if memory is local or remote. However the cpu topology is known (that is: which cpu belongs to which book) and the Linux kernel makes use of this in building scheduling domains (multi-core scheduling) accordingly and then tries to keep processes on a book instead of migrating them back and forth. With z196 another cache level was introduced. Linux kernel support for this should be merged upstream with the upcoming 2.6.37 kernel. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: inotify article
On Fri, 2010-09-10 at 10:06 -0500, McKown, John wrote: I'm not a real Linux heavy programmer (even though I weigh in at 230 pounds grin). I found this article on inotify to be interesting: Have a look at inotify-tools - very handy for bash. The tail utility has (finally) been updated to use inotify rather than polling. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: vmur usage ?
Who is this Altmark fella anyway ?. Shane g,d,r On Thu, Sep 9th, 2010 at 10:24 PM, Alan Altmark wrote: ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Suse SLES 11 / reiserfs / readonly problem
On Tue, 2010-08-24 at 11:00 -0400, Richard Troth wrote: As others have said, ReiserFS wants to replay the journal. EXT3 does too. (Not sure about EXT4.) So for RO I recommend EXT2. Whilst I'm prepared to believe anything of reiserfs (not having attempted to use it since before it was named thus), I query the assertion re ext3. Were it to be mounted r/o everywhere, I fail to see how the filesystem could have meta-data that would need replaying. But I admit to not having specifically tested that - maybe someday. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
vale openSolaris
Any comments from this august assemblage ?. I suppose David has more reason than most to feel umbrage. I kept wanting to get involved (non-z), but didn't see the effort being rewarded long-term. Even the devs that were at the kernel conference I was on when the acquisition was (formally) announced were not confident Oracle would continue the effort. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: kernel: page allocation failure recommendations
A lot more functionality is ascribed to swappiness than it deserves. I'd be thinking this is more an issue in the buddy allocator. The slub allocator is much better at handling things in more recent kernels. Should be the default IMHO. Shane ... On Thu, 2010-08-05 at 11:38 -0600, Mark Post wrote: On 8/5/2010 at 11:36 AM, Marcy Cortes marcy.d.cor...@wellsfargo.com wrote: Decrease to 0 is what I've been advocating under VM. Keeps linux from doing preemptive moves to swap. Just let VM see the page is being not used and he will page it out. Probably not what you want when your Linux system is having memory fragmentation problems. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: kernel: page allocation failure recommendations
I quite liked this from one of the kernel devs: quote But please bear in mind, this page allocation failure message is purely a developer diagnostic thing. The reason it is there is so that if some random toaster driver oopses over a failure to handle an allocation failure, the person who reports the bug can say I saw an allocation failure and then your driver crashed. Which tells the driver developer where to look. /quote Although recoverable, I'd be looking at adding storage to the guest. I can't see swappiness helping in this context - but I don't see it harming either, and I generally agree with the sentiment that it should be lower in a z/ environment. Getting up to date on the kernel would also be a good idea as Mark suggested - lots of reports on late 2.5 and early 2.6 kernels. Shane ... (interestingly I don't see this post on the maillist archive) Linux on 390 Port LINUX-390@VM.MARIST.EDU wrote on 05/08/2010 02:56:54 AM: We are running the following Linux: Linux linuxp01 2.6.5-7.315-s390x #1 SMP Wed Nov 26 13:03:18 UTC 2008 s390x s390x s390x GNU/Linux with SLES-9-s390x-SP4 + online updates under /VM Version 5 Release 4.0, service level 0902 (64-bit). Linux is defined with 768MB of memory. We recently implemented CICS Transaction Gateway version 6.0.1 fix pack and since then are seeing some page fault errors. However, I am not really seeing memory shortage issues with the z/VM monitor or the Linux free –m errors. I am thinking about lowering vm.swappiness from 60. What does everyone think, is that worth doing? Any other recommendations? We are limited on memory resources but if push came to shove, I could increase from 768MB to 1024MB and increase the swap space accordingly. I know, I know, all this stuff is old, but we are in the process of upgrading.
Re: Wed. July 28 (not June) 28 LVC-webcast -Linux on System z: Current Future Technologies
Whilst I'm sure lots of people (in the northern hemisphere) appreciate the running of this twice in the one day, this still equated to 23:00 and 04:00 for us on the Australian east coast. Much as I'd like to partake ... The ability to later re-run the session(s) at my leisure is much appreciated. Shane ... Please join us for the Linux webcast on Wednesday, July 28th that is offered twice this day: 9:00 AM EDT OR 2:00 PM EDT. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: OOM Condition on SLES11 running WAS - Tuning problems?
Hmmm - high sys CPU usage, high loadavg, system not talking to anyone. Smells like it's busy doing its own stuff. If it were me I'd want to know trends for things like swap-in and swap-out rates, tasks in uninterruptible sleep, context switch counts. SAR is too granular to be any use even if it did have the data. Set up a background script to run top and vmstat and write to disk every so often. A quick bit of awk should show the trend. You could do all the probing of /proc yourself, but I find it easier to allow things like top/ps/vmstat do all the grunt work. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: DB2 direct i/o question
Short answer, no. This was discussed earlier in the year - see: http://www.mail-archive.com/linux-390@vm.marist.edu/msg55911.html Shane ... On Tue, Jul 27th, 2010 at 1:17 AM, Marcy Cortes wrote: Is there a way to limit the amount of memory used for page cache? -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: OOM Condition on SLES11 running WAS - Tuning problems?
Some more info please. ... you get a OOM condition ?. ... the/a large consumer gets killed ? ... the system halts (explain) ?. You *want* a system-wide panic ?. If so, setting /proc/sys/vm/panic_on_oom to 1 will have the desired effect on non zLinux. Shane ... On Tue, Jul 27th, 2010 at 1:24 AM, Daniel Tate daniel.t...@gmail.com wrote: When websphere starts, it consumes all the memory eventually and halts, but not panics, the system. snip ... At this point i see two problems: 1) Why is OOM Kill not functioning properly -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Reducing Linux virtual machine size
This is somewhat empirical, and depending on the usage of shared libraries
will over-estimate the situation somewhat.
Not a bad thing in the context.
Determining actual accountable memory on linux has been like catching a
greased pig. With recent kernels you can work back from the pagemaps - here's
a citation from ../Documentation in the kernel source tree.
quote
Using pagemap to do something useful:
The general procedure for using pagemap to find out about a process' memory
usage goes like this:
1. Read /proc/pid/maps to determine which parts of the memory space are
mapped to what.
2. Select the maps you are interested in -- all of them, or a particular
library, or the stack or the heap, etc.
3. Open /proc/pid/pagemap and seek to the pages you would like to examine.
4. Read a u64 for each page from pagemap.
5. Open /proc/kpagecount and/or /proc/kpageflags. For each PFN you just
read, seek to that entry in the file, and read the data you want.
For example, to find the unique set size (USS), which is the amount of
memory that a process is using that is not shared with any other process,
you can go through every map in the process, find the PFNs, look those up
in kpagecount, and tally up the number of pages that are only referenced
once.
/quote
I have seen some user-space code to do all this - must move the testing of
this up my to-do list.
Shane ...
On Sat, Jul 24th, 2010 at 4:45 AM, Mrohs, Ray ray.mr...@usdoj.gov wrote:
Start up all your Linux procs and then run this little script.
#! /bin/sh
ps -eo pmem | awk '{pmem += $1}; END {print pmem = pmem%}';
It will give you a ballpark percentage of current memory utilization.
I tuned some Apache/ftp servers down to 100M with no ill effects.
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Re: Reducing Linux virtual machine size
I would be guessing you have lots of Oracle threads - all of which will have
the same common code mapped. And counted by the summation.
These fields only count resident memory - swap usage will be (sort of)
irrelevant. Pages that are swap cached (as distinct from only swapped out)
reside in real pages, and so can affect the pool of available page frames.
Determining this number is not simple. Recently the memory manager has
started using compressed page cache to ameliorate this effect somewhat.
Refer to my previous (flippant) comment.
Shane ...
On Sat, Jul 24th, 2010 at 8:05 AM, Tom Duerbusch wrote:
I tried your script on some of my images. Works fine, except when Oracle
is involved.
linux62:~ # ps -eo pmem | awk '{pmem += $1};END {print pmem =pmem%}';
pmem =1347.1%
I do have a lot of swap blocks allocated. This is due to a batch type
run, that is run off hours. During the day, when users are on, we swap
very little.
So if this does include swap pages, I don't think the script would give me
what I need, during normal processing. Do you agree? Or am off track
here?
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Re: Reducing Linux virtual machine size
Sorry ... that should be compressed _swap_ cache Shane ... On Sat, Jul 24th, 2010 at 9:00 AM, I wrote: ... Recently the memory manager has started using compressed page cache to ameliorate this effect somewhat. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: DB2 direct i/o question
On Sat, Jul 24th, 2010 at 10:20 AM, Marcy Cortes wrote:
Does this imply that the best setting for Linux on z is to use the FILE
SYSTEM CACHING (Direct i/o disabled)?
I won't presume to be able to answer that, but I will observe that Linus has
made some very harsh comments about database developers and their insistence
on using direct I/O.
In a virtualised environment their desire for total control of everything
would appear to be even more pointless.
I have also sat in on talks by said developers - they insist they can't
possibly get any performance without direct I/O.
Trying to figure out where all this memory is used...
ceztv14222:~ # free -m
total used free sharedbuffers cached
Mem: 15085 14947137 0 26 13835
-/+ buffers/cache: 1086 13999
Swap: 3662 3662 0
The memory is (almost) all being used for {disk,page} cache.
If you're concerned about the swap usage, have a look in /proc/pid/smaps.
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Re: IBM zEnterprise System announced???
Barton yanking Alans chain ... Where have I seen that before ?. Shane ... On Fri, Jul 23rd, 2010 at 5:26 AM, Barton Robinson wrote: Alan, are you trying to make this announcement so totally boring on purpose? Just business as usual? nothing really new and exciting? Is there anything here you could make exciting and explain why someone would care? -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: IBM zEnterprise System announced???
All the bits are now to be OSA connected. Shane ... On Fri, Jul 23rd, 2010 at 8:40 AM, Mark Post wrote: I didn't see any mention of an IP network, just that it was private. That could mean a lot of things. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Files on disk
I might just add that despite it's manpage assertion, rsync isn't too intelligent about it at all. My (non z) testing indicated that if you re-use the same target file, after the initial run cp is significantly more efficient. The initial run for both is comparable as the target needs to be created. Didn't test tar as it wasn't relevant (to me) at that juncture. Shane On Thu, Jul 22nd, 2010 at 3:06 AM, Edmund R. MacKenty wrote: Rick pointed out that rsync and tar have options that deal with sparse files intelligently: when they copy a sparse file, they do not write out blocks of all zeros. Instead, they seek past such empty blocks to avoid writing to them, thus creating a sparse output file. That's how a proper Linux file copy is done. The cp command also does that. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: IBM System z - A New Dimension in Computing webcast
Seems Jim couldn't keep the lid on things. The IBM Canada home page is all dressed up with nowhere to go ... :0) Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: SLES 11 SP 1 Bogus swap disk
Maybe you should be thankful Mark didn't go with the default RoT of swap=2xRAM Personally I've never allowed _any_ installer to handle partitioning, but I can appreciate your concern for the novice installer (person). They will/should probably be using mod-9s anyway, rather than trying to squeeze onto a mod3. Shane ... On Sat, Jul 10th, 2010 at 7:26 AM, Tom Duerbusch wrote: Sooo Would a 2 GB LPAR, create a disk based swap file of 1 GB off of my (in this case) 3390-3 disk? Not much space left to install Linux.. The novice installer that you are trying to help, then either needs to: 1. Get a bigger disk. 2. Get another disk and move some mount points to that disk. 3. Trim the number of packages or patterns to reduce the dasd requirements. That would sure give the novice installer some experience! G -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Configuring networking in zVM under Hercules???
Maybe - but a hacker wouldn't. But I'll bet he keeps his trap shut in future. Shane ... On Wed, Jun 9th, 2010 at 11:38 PM, Mrohs, Ray wrote: What we really just saw is another young person being turned away from z/VM, at a time when the next generation needs to be engaged and involved through whatever means possible. But now he will probably direct his energies elsewhere. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Configuring networking in zVM under Hercules???
Just to be clear, I use hacker in this sense: http://en.wikipedia.org/wiki/Hacker_(programmer_subculture) Shane ... On Wed, Jun 9th, 2010 at 11:56 PM, I wrote: Maybe - but a hacker wouldn't. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Linux on Z networking issue
On Sun, Jun 6th, 2010 at 2:13 AM, Alan Altmark wrote: ... a great candidate for a wiki article. There's even a placeholder just waiting for you Alan ... :0) This really is such a can of worms it needs something authoritative out where people can easily find it. Shane ... -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
