Re: qpidd and leap seconds (kernel futex bug?)
Hi guys, This is the best summary of the leap second problem I have seen thus far and figured it could not hurt to share: http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-during-a-leap-second Thanks Petter On Mon, Jul 2, 2012 at 10:50 PM, Peter van Hooft ho...@natlab.research.philips.com wrote: On Mon, Jul 02, 2012 at 08:42:28PM +0100, Jon Peatfield wrote: On Sun, 1 Jul 2012, Peter van Hooft wrote: Hi, On 6.2 (2.6.32-220.23.1.el6.x86_64) I noticed that qpidd started to use an enormous amount of cpu time. It is probably related to the last leap second. Doing an strace I saw it doing futex() calls in a furious rate. After doing the export LANG=C date; date `date +%m%d%H%M%C%y.%S`; date trick and restarting qpidd, the problem was gone. Caused by a kernel bug in 2.6.26 (apparently) 3.4.something. See: http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-during-a-leap-second which in turn points at: https://access.redhat.com/knowledge/solutions/154713 https://access.redhat.com/knowledge/articles/15145 for the RHEL6 info... The solutions stuff seems to require a subscription to view in full. Note that there seem to have been two bugs one may have caused a hard crash at any time on the day leading up to the leap-second, and the other causes excessive CPU usage after the leap-second has been applied. Machines with higher loads were more likely to suffer the hard crash. The bug all distros with the bad ranges of kernels, so e.g. el5/sl5 seems not to have been affected though el6/sl6 were. -- Jon Hi Jon, Thanks for your mail. I just wanted to note this for the benefit of others who ran into problems with qpidd. For your information, we've got reports of matlab running slowly (on systems without oopses, 'hrtimer: interrupt took x ns' or 'INFO: task x blocked for more than seconds' messages) and the re-setting of the system time seems to solve that as well. In other words, any application that uses java and/or multithreading may benefit from re-setting the system time, even if no evidence of kernel problems are present. Regards, Peter -- Petter Olsson System Administrator NumberFour AG Schönhauser Allee 8 10119 Berlin Germany Mobile: +49 170 2393359 Phone: +49 30 40505411 Fax: +49 30 40505410 pet...@numberfour.eu www.facebook.com/NumberFour www.twitter.com/numberfourag People who say it cannot be done should not interrupt those who are doing it.
Re: Scientific Linux 6.2 available on Amazon EC2
Hi, Static AMI's seems useful for people who just want to try something out. Personally the Boxgrinder project is what I use to create new AMI's. Thanks Petter On Thu, May 3, 2012 at 11:08 AM, Corey Quinn co...@sequestered.net wrote: On May 3, 2012, at 1:56 AM, Jamie Kinney wrote: I have created a Scientific Linux 6.2 x86_64 Amazon EC2 machine image (AMI) and would welcome your feedback. The AMI currently resides in the us-east-1 (Northern Virginia) Amazon EC2 region. If there is enough interest, I could easily publish this AMI to all AWS regions. The AMI is ami-e2a0058b. https://console.aws.amazon.com/ec2/home?region=us-east-1#launchAmi=ami-e2a0058b Feel free to contact me directly with any questions/comments. Thanks for doing this. [root@ip-10-196-57-7 ec2-user]# rpm -qa |wc -l 622 Looks a bit heavy from my side-- most instances I tend to spin up hover between 200-300 packages installed. Is this by design? I guess my real question becomes What's the intended use case for this AMI? -- Corey -- Petter Olsson System Administrator NumberFour AG Schönhauser Allee 8 10119 Berlin Germany Mobile: +49 170 2393359 Phone: +49 30 40505411 Fax: +49 30 40505410 pet...@numberfour.eu www.facebook.com/NumberFour www.twitter.com/numberfourag People who say it cannot be done should not interrupt those who are doing it.
Re: Help for openstack img 6.2
Create one using Boxgrinder perhaps? It's what I use to create AMI's and it supports almost all VM platforms. Thanks Petter 2012/3/12 Yan Xiaofei ya...@ihep.ac.cn: Is there public SL6.2 img for openstack. Xiaofei -- Petter Olsson System Administrator NumberFour AG Schönhauser Allee 8 10119 Berlin Germany Mobile: +49 170 2393359 Phone: +49 30 40505411 Fax: +49 30 40505410 pet...@numberfour.eu www.facebook.com/NumberFour www.twitter.com/numberfourag People who say it cannot be done should not interrupt those who are doing it.
Re: reply to list request
Trying to determine if there actually is such a thing as a CentOs-virt header I googled it. This email thread itself is the top hit ;-) FYI: http://www.google.de/search?hl=enclient=safaribiw=320bih=416q=CentOS-virt+headeroq=CentOS-virt+headeraq=faqi=aql=gs_sm=3gs_upl=181942l184600l0l186374l1l1l0l0l0l0l0l0ll0l0mvs=0 Sent from my iPhone On 13.03.2012, at 05:32, g gel...@bellsouth.net wrote: On 02/25/2012 06:21 AM, Todd And Margo Chester wrote: Dear List Administrator, -=- i am a list subscriber, not List Administrator. I have noticed in Thunderbird, that when I go to reply to a message in the CentOS-virt list, that I have a reply to list option that I do not have in this list. -=- that is because CentOS 'list server' has ability to insert a Reply-To: line into forwarded emails. I have also noticed that in this list, that you have to change the To: back to the list when replying. -=- because list server does not have ability to do so, or is not enabled. Apparently a lot of folks miss this too, as I get a lot of replies directly to me and not to the list. -=- this is because many responders do not pay attention to what they are sending, or, do not care who email is sent to. ;-) This deprives the list of any wisdom that is being shared. -=- call it such if you will. but if poster is 'with wisdom', replier should be aware of such and makes such a change on their own. 8-D Checking the message source of the two lists, this header appears in CentOS-virt, but not yours: List-Id: Discussion about the virtualization on CentOS centos-virt.centos.org Maybe this is what triggers the reply to list option in CentOS-virt and not your list? -=- nope, that identifies list and has nothing to do with addressing. From: ,To: , Reply-To: are what determines how addressee lines are built in an email reply with thunderbird client when you click on Reply or Reply All icon button in Tool Bar. Would you please consider adding whatever header is needed to trigger the reply to list function in your list. -=- such should be, but may not be, available with list server used at fnal.gov. Many thanks, -T p.s. I can eMail you a full CentOS-virt header if you need it. -=- if you do so, please send it directly to List Administrator and not to this email tech support list. i, and i imagine many others, do not care to see what a CentOS-virt header looks like. to summate; *npoti*. -- peace out. tc.hago, g . *please reply plain text only. html text are deleted* in a free world without fences, who needs gates. ** help microsoft stamp out piracy - give linux to a friend today. ** to mess up a linux box, you need to work at it. to mess up an ms windows box, you just need to *look* at it. ** The installation instructions stated to install Windows 2000 or better. So I installed Linux. ** learn linux: 'Rute User's Tutorial and Exposition' http://rute.2038bug.com/index.html 'The Linux Documentation Project' http://www.tldp.org/ 'LDP HOWTO-index' http://www.tldp.org/HOWTO/HOWTO-INDEX/index.html 'HowtoForge' http://howtoforge.com/
SL 6.x on Mac mini
Hi guys, Do anyone have any experience running SL 6.x on the new Mac minis? Does it even work? Any feedback before we buy a single one of these would be much appreciated. FYI: http://www.apple.com/macmini/specs.html Thank you! Petter ps. Apparently I was removed from this email list which I did not notice until I tried to send this mail. Not sure how that happened! -- Petter Olsson System Administrator NumberFour AG Schönhauser Allee 8 10119 Berlin Germany Mobile: +49 170 2393359 Phone: +49 30 40505411 Fax: +49 30 40505410 pet...@numberfour.eu www.facebook.com/NumberFour www.twitter.com/numberfourag People who say it cannot be done should not interrupt those who are doing it. -- Petter Olsson System Administrator NumberFour AG Schönhauser Allee 8 10119 Berlin Germany Mobile: +49 170 2393359 Phone: +49 30 40505411 Fax: +49 30 40505410 pet...@numberfour.eu www.facebook.com/NumberFour www.twitter.com/numberfourag People who say it cannot be done should not interrupt those who are doing it.
Re: SL6.1 installer requires internet connection?
This is what I always used: http://unetbootin.sourceforge.net/ Sent from my iPhone On 23.11.2011, at 02:22, Konstantin Olchanski olcha...@triumf.ca wrote: On Tue, Nov 22, 2011 at 03:39:16PM -0800, Christopher Tooley wrote: You might also be able to make a bootable USB stick by using the tool found here: https://fedorahosted.org/liveusb-creator/ You can select any Live CD you wish I think. But I am not making a Live CD. I am making an Installer disk. But perhaps the tool is misnamed. -- Konstantin Olchanski Data Acquisition Systems: The Bytes Must Flow! Email: olchansk-at-triumf-dot-ca Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada
KVM guests with time sync issues
Hi guys, We are experiencing some problems with our Windows 7 guests running on KVM. This specifically relates to the time sync which is always off, way off. Here is a quick rundown of the setup that we have done. My apologies if this is too much detail but about two days on Google and tried all things I could find have not resolved this issue thus far. Install: Scientificlinux 6.1 Minimal install Added the following packages after a yum update: bridge-utils, curl, emacs, htop, iotop, kpartx, mc, ncftp, nfs-utils, ntpd, rsync, ruby, urw-fonts, vim, wget, xauth, xorg-x11-fonts* Added EPEL Created the bridge Set selinux to permissive Added the following packages: libguestfs-tools, libvirt, python-virtinst, virt-manager, virt-top, virt-viewer VM Added: Added one new VM, Windows 7 Enterprise Edition with SP1. No virtio drivers used. Added one new VM, Windows 7 Enterprise Edition with SP1. Virtio drivers used. I have attached one xml document at the end of this email showing the current config. The most bizarre solution I have tried thus far is setting up a local NTP server and having the Windows machine update every 5 seconds. Still, same problem. We have tried many different configs and solutions but to no luck. Any help in this matter is highly appreciated. Thanks Petter === CURRENT CONFIG === domain type='kvm' namebuild-win7-1/name uuid9b5f36a6-468a-1ac7-5a34-0a1dcfa82656/uuid memory2097152/memory currentMemory2097152/currentMemory vcpu1/vcpu os type arch='x86_64' machine='rhel6.1.0'hvm/type boot dev='hd'/ /os features acpi/ apic/ pae/ /features clock offset='localtime'/ on_poweroffdestroy/on_poweroff on_rebootrestart/on_reboot on_crashrestart/on_crash devices emulator/usr/libexec/qemu-kvm/emulator disk type='file' device='disk' driver name='qemu' type='raw' cache='none'/ source file='/var/lib/libvirt/images/build-win7-1'/ target dev='vda' bus='virtio'/ address type='pci' domain='0x' bus='0x00' slot='0x04' function='0x0'/ /disk controller type='ide' index='0' address type='pci' domain='0x' bus='0x00' slot='0x01' function='0x1'/ /controller interface type='bridge' mac address='00:16:36:7f:72:80'/ source bridge='br0'/ address type='pci' domain='0x' bus='0x00' slot='0x03' function='0x0'/ /interface serial type='pty' target port='0'/ /serial console type='pty' target port='0'/ /console input type='tablet' bus='usb'/ input type='mouse' bus='ps2'/ graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/ video model type='vga' vram='9216' heads='1'/ address type='pci' domain='0x' bus='0x00' slot='0x02' function='0x0'/ /video memballoon model='virtio' address type='pci' domain='0x' bus='0x00' slot='0x05' function='0x0'/ /memballoon /devices /domain === END CURRENT CONFIG === -- Petter Olsson System Administrator NumberFour AG
Re: KVM guests with time sync issues
Hi Klaus, Thank you very much. This fixed the issue for me. Googling that setting takes me directly to the documentation I have read several times. I apparently did not try enough options and should have read it more carefully. Thanks Petter On Thu, Nov 3, 2011 at 1:53 PM, Klaus Steinberger klaus.steinber...@physik.uni-muenchen.de wrote: Hi Peter, we run into same trouble and got some hints from TUV (we have some RHEL systems with support). There is a ticket open in TUV's supports about the issue. Try the following clock settings for your Windows VM's: clock offset='localtime' timer name='rtc' tickpolicy='catchup'/ /clock Sincerly, Klaus -- Rechnerbetriebsgruppe / IT, Fakultät für Physik Klaus Steinberger FAX: +49 89 28914280 Tel: +49 89 28914287 -- Petter Olsson System Administrator NumberFour AG Schönhauser Allee 8 10119 Berlin Germany Mobile: +49 170 2393359 Phone: +49 30 40505411 Fax: +49 30 40505410 pet...@numberfour.eu www.facebook.com/NumberFour www.twitter.com/numberfourag
