Re: [CentOS] Correlate i/o with a process
On Fri, 2007-08-17 at 20:29 -0400, Mag Gam wrote: > Thanks John. > > Yes, this is a tricky question, but I face this a > lotUnfortunately, I am not sure how to check the adapter > throughput, and what process is causing the i/o wait. > > > On 8/17/07, John R Pierce <[EMAIL PROTECTED]> wrote: > Mag Gam wrote: > > Hello: > > > > I have a server with 2 HBAs, and the users keeps complaining > about > > performance problems. My question is, how can I relate the > process > > with high I/O wait? Also, is it possible to see how much > data is being > > pushed thru by my 2 HBAs? > > iostat (part of the sysstat package) will answer your 2nd > question. > > I dunno how to measure io wait time per process. maybe IBM's > NMON can > do that, not sure, I haven't used it for a while. > http://www-941.haw.ibm.com/collaboration/wiki/display/WikiPtype/nmon > I *think* that sar (System Activity Reporting?) package is still available? Haven't looked/used for a long time. If so, you should be able to get what you want, and a lot more, by installing and activating it. HTH -- Bill ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Install CentOS over FTP / STRANGE THING
On Fri, 2007-08-17 at 16:03 -0400, Phil Schaffner wrote: > On Fri, 2007-08-17 at 18:45 +0100, Mário Gamito wrote: > > Hi, > > > > > > > > I just read in your previous email that your pc goes berzerk when > > > trying to change things on the BIOS, in such case, most probably > > > you'll run into issues afterwards even if you manage to start the > > > installations :( > > It's now booting, but strange things happen. > > > > It say my hard drive is hda and my CD-ROM is hdb. > > > > But then, it states that: > > ide0 is hda and hdb > > ide1 is hdc and hdd > > > > therefore, as there is no hdc and hdd, it just hangs :( > > > > Any idea ? > > > Anyway, the above messages don't seem to be problematic - the controller > ports will be seen even if nothing is attached to them, and may/may not > be relevant to the problems are seeing. Have to agree with Jordi Molina > - looks like you may have BIOS/hardware issues. *If* you can get into BIOS, disable IDE 2 and see if that doesn't stop the "hang" (I suspect it is not hung, but just timing out waiting for some device to respond - can take a *long* time). > Might try checking > cables and re-seating things - chips/boards. Could try clearing CMOS - > there's often a jumper you can short on the motherboard to do that. > Might try a different CD drive. Also, *if* you have a choice, put the CD on the 2nd IDE port (after re- enabling it if you disabled it) to reduce contention when using both the CD and HD at the same time. Since you have a P III and I have a P II board (and older) in some of my machines that will boot from CD on secondary IDE ports, maybe yours would allow this too? Might take care of some issues. The suggestion to try resetting the BIOS is a good one. Also, maybe time to replace the CMOS battery on a mainboard that old? Might get rid of the flakiness in your BIOS? > HTH -- Bill ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] GNBD and DRBD kernel mods
Bart wrote: > Hi all, > > I am using heartbeat and drbd on CentOS 5 (see > http://www.centos.org/modules/newbb/viewtopic.php?topic_id=7816&forum=41 for > details).. > > DRBD and heartbeat are working, and now I want to put GNBD on top on this. > However, I installed the latest CentOS-plus kernel > (2.6.18-8.1.8.el5.centos.plus) but there doesn't appear to be a kmod-gndb for > this kernel. > > Looks like the latest kmod-gnbd is available for kernel 2.6.18-8.1.8.el5. But > I cannot find a kmod-drbd for this kernel. Am I missing something or is this > worth a entry in the buglist? > > Tnx! > That kmod is in extras repo: http://mirror.centos.org/centos/5/extras/i386/RPMS/ signature.asc Description: OpenPGP digital signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Correlate i/o with a process
On Fri, 17 Aug 2007, John R Pierce wrote: > Mag Gam wrote: > > Hello: > > > > I have a server with 2 HBAs, and the users keeps complaining about > > performance problems. My question is, how can I relate the process with high > > I/O wait? Also, is it possible to see how much data is being pushed thru by > > my 2 HBAs? > > iostat (part of the sysstat package) will answer your 2nd question. > > I dunno how to measure io wait time per process. maybe IBM's NMON can do > that, not sure, I haven't used it for a while. > http://www-941.haw.ibm.com/collaboration/wiki/display/WikiPtype/nmon nmon is packaged as part of RPMforge :) -- dag wieers, [EMAIL PROTECTED], http://dag.wieers.com/ -- [Any errors in spelling, tact or fact are transmission errors] ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Install on a usb flash drive
I all, I was thinking about installing centos on a usb flash drive. Perhaps a 4GIG. I dont need X or anything on this drive so installing should fit just fine. Are there boot issues with these flash drives? I'll be using a newer motherboard so the motherboard should be able to boot USB. Does this work? Have others done anything with flash drives? I am wanting this flash drive to be the ONLY drive in the computer. Kind of a dedicated machine running multiple RS232 multiport cards. Thanks, Jerry ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Correlate i/o with a process
On Fri, 17 Aug 2007, Mag Gam wrote: > On 8/17/07, John R Pierce <[EMAIL PROTECTED]> wrote: > > Mag Gam wrote: > > > > > I have a server with 2 HBAs, and the users keeps complaining about > > > performance problems. My question is, how can I relate the process > > > with high I/O wait? Also, is it possible to see how much data is being > > > pushed thru by my 2 HBAs? > > > > iostat (part of the sysstat package) will answer your 2nd question. > > > > I dunno how to measure io wait time per process. maybe IBM's NMON can > > do that, not sure, I haven't used it for a while. > > http://www-941.haw.ibm.com/collaboration/wiki/display/WikiPtype/nmon > > Thanks John. > > Yes, this is a tricky question, but I face this a lotUnfortunately, I am > not sure how to check the adapter throughput, and what process is causing > the i/o wait. I believe that recent kernels have a patch applied that show io counters per process. I haven't looked into it yet though. This is one of the most important items on my wishlist for dstat, a topio plugin next to the existing topcpu and topmem plugins. Kind regards, -- dag wieers, [EMAIL PROTECTED], http://dag.wieers.com/ -- [Any errors in spelling, tact or fact are transmission errors] ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Install on a usb flash drive
It'll only be a problem if you're planning to use a swap file or do frequent writes (compiling programs, etc). Solid state devices really aren't great if your going to do heavy writing because they will fry eventually. Under normal usage this could be years, but with heavy daily use it could be months. Geoff Sent from my BlackBerry wireless handheld. -Original Message- From: Jerry Geis <[EMAIL PROTECTED]> Date: Sat, 18 Aug 2007 13:32:29 To:CentOS ML Subject: [CentOS] Install on a usb flash drive I all, I was thinking about installing centos on a usb flash drive. Perhaps a 4GIG. I dont need X or anything on this drive so installing should fit just fine. Are there boot issues with these flash drives? I'll be using a newer motherboard so the motherboard should be able to boot USB. Does this work? Have others done anything with flash drives? I am wanting this flash drive to be the ONLY drive in the computer. Kind of a dedicated machine running multiple RS232 multiport cards. Thanks, Jerry ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Install on a usb flash drive
An interesting idea. How would the install work? If you boot from DVD with the USB drive installed, will it see the drive and make it an option for the install destination? Thanks, Scott On 8/18/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > It'll only be a problem if you're planning to use a swap file or do frequent > writes > (compiling programs, etc). Solid state devices really aren't great if your > going > to do heavy writing because they will fry eventually. Under normal usage this > could be years, but with heavy daily use it could be months. > > Geoff > > > -Original Message- > From: Jerry Geis <[EMAIL PROTECTED]> > Date: Sat, 18 Aug 2007 13:32:29 > To:CentOS ML > Subject: [CentOS] Install on a usb flash drive > > I all, I was thinking about installing centos on a usb flash drive. Perhaps a > 4GIG. I dont need X or anything on this drive so installing should fit just > fine. > > Are there boot issues with these flash drives? I'll be using a newer > motherboard so the motherboard should be able to boot USB. > > Does this work? Have others done anything with flash drives? I am > wanting this flash drive to be the ONLY drive in the computer. > Kind of a dedicated machine running multiple RS232 multiport cards. > > Thanks, > > Jerry > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
