Re: [CentOS] Problems with motherboard support? INTEL DP43BF
- Original Message From: John R Pierce pie...@hogranch.com To: centos@centos.org Sent: Tue, December 28, 2010 2:59:09 AM Subject: Re: [CentOS] Problems with motherboard support? INTEL DP43BF On 12/27/10 9:09 PM, robert mena wrote: Regular realtek fast ethernet. IMNSHO, realtek are pretty close to junk grade NICs.they have far too many variations with far too many weird bugs when used for any more than single user desktop kind of systems. rl nics are toy nics. I wouldn't use them on production servers unless I have no choice For some reasons, see this, textually from FreeBSD's 5.4 if_rl.c: /* * The RealTek 8139 PCI NIC redefines the meaning of 'low end.' This is * probably the worst PCI ethernet controller ever made, with the possible * exception of the FEAST chip made by SMC. The 8139 supports bus-master * DMA, but it has a terrible interface that nullifies any performance * gains that bus-master DMA usually offers. * * For transmission, the chip offers a series of four TX descriptor * registers. Each transmit frame must be in a contiguous buffer, aligned * on a longword (32-bit) boundary. This means we almost always have to * do mbuf copies in order to transmit a frame, except in the unlikely * case where a) the packet fits into a single mbuf, and b) the packet * is 32-bit aligned within the mbuf's data area. The presence of only * four descriptor registers means that we can never have more than four * packets queued for transmission at any one time. * * Reception is not much better. The driver has to allocate a single large * buffer area (up to 64K in size) into which the chip will DMA received * frames. Because we don't know where within this region received packets * will begin or end, we have no choice but to copy data from the buffer * area into mbufs in order to pass the packets up to the higher protocol * levels. * sadly, things hadn't improved since then Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS-virt] awful i/o performance on xen paravirtualized guest
Hi. I'm testing a centos 5.4 xen PV guest on top of a centos 5.4 host. for some reason, the disk performance from the guest is awful. when I do an import , the io is fine for a while then climbs to 100% and stays there most of the time. at first I tougth it was because I was using file-backed disks, so deleted those and changed to LVM, but the situation did't improve. Here's an iostat output from within the DomU: Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz avgqu-sz await svctm %util xvda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 xvda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 xvda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 xvdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 xvdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 xvdd 0.00 271.00 0.00 179.00 0.00 1800.0020.11 1.99 11.11 5.59 100.00 dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 dm-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 dm-3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 dm-4 0.00 0.00 0.00 450.00 0.00 1800.00 8.00 4.93 10.93 2.22 100.00 the service time is a bit high but the and here from within the dom0: Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz avgqu-sz await svctm %util cciss/c0d00.00 0.00 0.00 169.00 0.00 1640.0019.41 2.00 11.74 5.94 100.40 cciss/c0d0p1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 cciss/c0d0p2 0.00 0.00 0.00 169.00 0.00 1640.0019.41 2.00 11.74 5.94 100.40 dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 dm-2 0.00 0.00 0.00 87.00 0.00 768.0017.66 1.00 11.45 11.49 100.00 dm-3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 dm-4 0.00 0.00 0.00 82.00 0.00 856.0020.88 1.00 12.05 12.24 100.40 a DB import takes almost 10 times longer than in the bare-metal server, even if the server I'm planing to virtualize is 4 years old and the guest is a brand new DL380 from HP. In the old server takes 4hs, in the new one takes 2 days. That's not surprising given the fact that the disk shows a peak throughput below 2Mb/s here's the vm config file: [r...@xen2 xen]# cat vm-dbweb name = vm-dbweb uuid = 8560e33a-865e-cca5-725d-817de4972422 maxmem = 7168 memory = 7168 bootloader=/usr/bin/pygrub vcpus = 2 on_poweroff = destroy on_reboot = restart on_crash = restart disk = [ tap:aio:/var/lib/xen/images/vm-artweb.img,xvda,w, \ tap:aio:/var/lib/xen/images/dbweb_home.img,xvdb,w, \ phy:/dev/VolGroup00/dbweb_oradata,xvdc,w, \ phy:/dev/VolGroup00/dbweb_oradata2,xvdd,w ] vif = [ mac=00:16:36:5a:4d:a1,bridge=xenbr0,script=vif-bridge ] I'm pretty sure there is a way to get decent disk performance from a domU, and I must be screwing things up somewhere, I just don't find where :/ any help/pointers/tips for disk tuning would be greatly apreciated. Fer ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS] directory permissions set to 600?
- Original Message From: Robert Heller hel...@deepsoft.com To: CentOS mailing list centos@centos.org Cc: CentOS mailing list centos@centos.org Sent: Tue, July 20, 2010 9:17:28 PM Subject: Re: [CentOS] directory permissions set to 600? um... on a directory, the X bit means you can LS the contents of the directory. of course, root ignores this anyways and overrides it. Note that execute access is only needed on a directory if you want to list its contents (eg ls). If you know ahead of time the name of the file in the directory you seek to access, you don't need execute access on the directory. Not having execute access on a directory keeps 'noisy' people from discovering the contents of the directory. This is a not unreasonably security setting. Nope. for dirs, 'w' means you can create and delete files (because creating and deleting files means inserting and removing entries in the dir), r means you can list the dir (which makes sense, since what 'ls' does is reading the dir entries. 'x' means you can cd into the directory) Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS-virt] accesing remote domU vnc console?
I'm having an strange weird problem while trying to connect to a remote domU console The VM runs win2k3, I need to connect on the console in order to change its IP address I log into dom0, find the domU ID: [r...@btreptab01 xen]# virsh list Id Name State -- 0 Domain-0 running 8 linuxidle 9 win2k3 running so I open a new session and tunnel vnc through it: ssh -L 5907:localhost:5907 r...@remoteip then launch a vnc client krdc localhost:7 and nothing happens :/ netstat shows the connection as established on both hosts, but I can't get a console working, just a blank screen I tried enabling vncserver on dom0, connecting to it, launching virt-manager and trying to attach to it, same result. It shows a connecting to console message and nothing more the dom0 host is in a datacenter many miles away from here, so walking to it and working on the server's console is not a practical option any ideas/help would be greatly apreciated ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
[CentOS-virt] is the xenconsoled crash solved?
One of our machines are being bitten by that bug, once every 2-4 weeks or so xenconsoled dies and all the VMs stop responding intil xenconsoled is restarted. I googled for it and I saw many people reporting it but no solution for it. Does anyone know if it is solved in 5.5? I can't upgrade the box (it's a production box) unless I can prove the problem will go away. thanks in advance ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS] ssh slow
- Original Message From: ann kok oiyan...@yahoo.ca To: centos@centos.org Sent: Wed, May 5, 2010 9:44:12 PM Subject: [CentOS] ssh slow Hi How I can configure sshd_config to improve the ssh faster? It is slow to prompt the login Fix your DNS setup and/or configure it to UseDNS no. Such slowdowns happen because sshd tries to get a reverse DNS lookup of your IP address. It can be a big PITA when you try to login into a server to fix a broken DNS and the login times out because it tries to get a that PTR record back.. Just remember the mantra: most weird network problems are related to DNS problems. Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Debugging slow apache server?
From: Rob Kampen rkam...@kampensonline.com To: CentOS mailing list centos@centos.org Sent: Tue, April 20, 2010 9:59:57 AM Subject: Re: [CentOS] Debugging slow apache server? On Apr 20, 2010, at 8:28 AM, Roland RoLaNd r_o_l_a_...@hotmail.com wrote: hello, i'm using an apache server to host 8 virtual hosts. even though this server is local.. 7 out of these 8 virtual hosts open extremly slow.. it takes around 10 seconds to open a page.. though the 8th (which is a completely different site) it opens fairly fast in around 1 or 2 seconds tops.. i tried tailing the error_log and i found nothing .. is there a way i could monitor wht each branch is doing and what's causing it to be so slow? any suggestion ? Check DNS resolution for all the domains +1 Most unexplained delays and bizarre problems in network services can be traced back to broken DNS stuff Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] How Do I ...
- Original Message From: Jobst Schmalenbach jo...@barrett.com.au To: centos@centos.org Sent: Thu, April 15, 2010 1:20:45 AM Subject: Re: [CentOS] How Do I ... ;-) in the olden days it was so easy, you had PCI cards and they were named by the slot number, starting with eth0 in PCI slot 1 and so on. Then came the inbuilt nics Then came the PCIx built nics Then came the PCI-e built nics OUCH! ;-) Then came blade servers with built-in nics you can't unplug because they're plugged to the blade center enclosure's internal switches :) I had an awful time trying to install a bunch of servers via PXE, the server booted from one nic, then tried to configure eth0 which was ANOTHER nic which was (of course) connected to a different built in switch and the installation failed because it couldn't access the kickstart file. We had to trunk the 4 internal switches for the install, then we had to look into the switch's management to see which card was in what port, then modify the ifcfg-ethX to configure each one of the NICs with the right IP Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] help fdisk and dd
- Original Message From: Paul Heinlein heinl...@madboa.com To: CentOS mailing list centos@centos.org Sent: Fri, March 5, 2010 8:16:19 PM Subject: Re: [CentOS] help fdisk and dd Or, donate the drives and a cheap torx driver to the educational charity of your choice. Kids *love* taking them apart, and the magnets are quite useful! HD magnets are great. Those are one of the few things strong enough to keep my 2-year old son from opening doors and drawers :) Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] emergency! linux kickstart pxe boot needed
- Original Message From: Alan McKay alan.mc...@gmail.com To: CentOS mailing list centos@centos.org Sent: Sun, February 28, 2010 1:51:18 PM Subject: [CentOS] emergency! linux kickstart pxe boot needed Is PXE kickstart easy to set up? I have a laptop here with DHCP already going. I google and a bunch of stuff comes up but it does not look simple. I'm just shooting htis out ther eon the odd chance someone gets it soon nad knows of a really easy howto for this yum install cobbler and use cobbler to build a netinstall server in 10 minutes :) These are very handy: http://wiki.xdroop.com/space/RedHat/kickstart/Cobbler http://magazine.redhat.com/2007/08/10/cobbler-how-to-set-up-a-network-boot-server-in-10-minutes/ And the oficial documentation https://fedorahosted.org/cobbler/ Hope this helps Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Resizing a PV that belongs within a Volume Group?
- Original Message From: Eric B. ebe...@hotmail.com To: centos@centos.org Cc: linux-...@redhat.com Sent: Thu, February 18, 2010 6:11:26 PM Subject: [CentOS] Resizing a PV that belongs within a Volume Group? Hi, I was wondering if there was a way to extend (ie: grow) a PV that is part of a Volume Group? I currently have a partition on my HD that is being used as a PV for my Volume Group, but would like to make it larger. I have the space on my drive to extend my partition, but using standard tools (ex: gparted, Partition Magic, etc) would likely end up corrupting the data on in the Logical Volumes that are housed within the VG. I realize that I could just create a new partition on my HD and just add it to my Volume Group and extend my Volume Group, however, given that it would be two contiguous partitions on the HD, I was just wondering if there was a way of resizing the original partition within the VG without causing any problems. I tried looking at tools like pvresize but I can't seem to understand the right arguments to use it as whatever I try never seems to resize the original partition itself. I also looked at system-config-lvm GUI tool, but that doesn't seem to allow me to make the PV any larger. Does anyone have any suggestions? First extend the physical media (resize the partition, LUN, whatever), then just pvresize the new partition Use with care, test it a few times in a test box or VM, then try it in production, if you screw up you'll lose your data. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] best practice: how to setup a central network installation server?
- Original Message From: Marcelo M. Garcia marcelo.maia.gar...@googlemail.com To: CentOS mailing list centos@centos.org Sent: Thu, February 18, 2010 7:16:45 AM Subject: Re: [CentOS] best practice: how to setup a central network installation server? Rudi Ahlers wrote: kickstart file, if you are familiar with text based configurations? Is kickstart REALLY the only way? How do I configure the server so that the client can use network boot, without a CD? Hi You can use PXE. You have to set up a tftp and a DHCP server. Sometimes you have to enable PXE in the BIOS - I always to do this with Dell machines. Install cobbler, it makes building a netinstall server as easy as 1 2 3 cobbler handles pxe, dhcp, http repo setup, kickstart and such. I've used it many times, it takes less than 15 minutes from yum install cobbler to the start of the network installs of the client machines. Once you set it up, just power on the client machine and watch it install automagically Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] HP Proliant ML150 : how do I access disks ?
- Original Message From: Nickolay Bunev just4n...@gmail.com To: CentOS mailing list centos@centos.org Sent: Wed, February 17, 2010 10:45:52 AM Subject: Re: [CentOS] HP Proliant ML150 : how do I access disks ? Hello there, I don't know about ML's but with DL series CentOS don't have any problems at all and with seeing disks in particular. So I presume that Rainer is absolutely right. You have to build an array first. ML and DL are the same beasts, the DLs are the rack-mount ones, the DLs are the tower ones And yes, first build the array from within the smatarray utility, then you can install centos. I've installed centos, rhel and fedora on 100s of MLs and DLs without any problems Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] HP Proliant ML150 : how do I access disks ?
- Original Message From: Niki Kovacs cont...@kikinovak.net To: CentOS mailing list centos@centos.org Sent: Wed, February 17, 2010 7:26:03 PM Subject: Re: [CentOS] HP Proliant ML150 : how do I access disks ? Fernando Gleiser a écrit : And yes, first build the array from within the smatarray utility, then you can install centos. I've installed centos, rhel and fedora on 100s of MLs and DLs without any problems I'm sorry but I can't seem to find that Smart Array utility. The machine I have was shipped as is, with some loose disks, no apparent system on it, and it came without any CD or handbook. And the HP site isn't exactly helpful for that. Officially this hardware supports RHEL3 and RHEL4, and that's it. Looks like there's no way to install CentOS5 on it (correct me if I'm wrong). Plus, I admit I'm lost in the sheer myriad of options in the various boot configuration tools (bios, scsi configurator). So far I haven't managed to have any disk recognized, and what puzzles me is that there isn't the slightest mention of a disk in the bios. google for ml150 rhel5 site:hp.com yields this results: http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1266453497093+28353475threadId=1355141 http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1266453513678+28353475threadId=1364104 http://h2.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=encc=usprodNameId=3884324prodTypeId=15351prodSeriesId=3884323swLang=8taskId=135swEnvOID=4006 the last ones have drivers and such for download hope that helps Fer Niki ___ 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] disk I/O problems with LSI Logic RAID controller
- Original Message From: Ross Walker rswwal...@gmail.com To: CentOS mailing list centos@centos.org Cc: CentOS mailing list centos@centos.org Sent: Thu, February 11, 2010 12:30:43 PM Subject: Re: [CentOS] disk I/O problems with LSI Logic RAID controller On Feb 11, 2010, at 2:46 AM, Andrzej Szymanski wrote: The iostat output looks good to me for the RAID setup you have. I'd look for the problem in a different place: note the output of cat /proc/sys/vm/dirty_background_ratio and try echo 1 /proc/sys/vm/dirty_background_ratio whether it helps. Excellent suggestion, on machines with lots of memory the default dirty background ratio is way too big, and needs to be tuned down for both data integrity in the event of a system failure and performance of the underlying storage configuration. Take into account the RAID setup, write-back cache size and time it takes to empty it to disk and pick a dirty background ratio somewhere in between. You nailed it. I tweaked the dirty_background ratio and changed the scheduller to deadline and now it works way better. it still see-saws a bit but the utilization never dropts to zero. Thanks you for your help. Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] disk I/O problems with LSI Logic RAID controller
we're having a weird disk I/O problem on a 5.4 server connected to an external SAS storage with an LSI logic megaraid sas 1078. The server is used as a samba file server. Every time we try to copy some large file to the storage-based file system, the disk utilization see-saws up to 100% to several seconds of inactivity, to climb up again to 100% and so forth. Here are a snip from the iostat -kx 1: Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz avgqu-sz await svctm %util sdb1 0.00 133811.00 0.00 1889.00 0.00 513660.00 543.84 126.24 65.00 0.47 89.40 sdb1 0.00 138.61 0.00 109.90 0.00 29845.54 543.14 2.54 54.32 0.37 4.06 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 134680.00 0.00 1920.00 0.00 526524.00 548.46 126.06 64.57 0.47 90.00 sdb1 0.00 142.00 0.00 74.00 0.00 20740.00 560.54 1.25 45.14 0.47 3.50 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 0.00 1.00 0.00 4.00 0.00 8.00 0.01 14.00 14.00 1.40 sdb1 0.00 116129.00 1.00 1576.00 4.00 434816.00 551.45 125.47 75.38 0.57 90.30 sdb1 0.00 17301.98 0.00 412.87 0.00 106506.93 515.93 24.59 75.40 0.48 19.80 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 It happens when I copy a file over the net using samba or when copying/creating a local file It looks like the disk tries to get more than it can handle, then it chokes with data and stales for a few seconds until some buffer empties and it's able to get a bit more data again. It happens in two identical servers, so I'd discard faulty hardware as the cause and look into a miscofiguration issue. Are there any guidelines/docs for heavy I/O tuning? are there any issues with this raid controller? any help will be apreciated Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] disk I/O problems with LSI Logic RAID controller
- Original Message From: nate cen...@linuxpowered.net Not sure I know what the issue is but telling us how many disks, what the RPM of the disks are, and what level of RAID would probably help. It sounds like perhaps you have a bunch of 7200RPM disks in a RAID setup where the data:parity ratio may be way out of whack(e.g. high number of data disks to parity disks), which will result in very poor write performance. yes, ita bunch of 12 7k2 RPM disks organized as 1 hot spare, 2 parity disks, 9 data disks in a RAID 5 configuration. is 9/2 a high ratio? Thanks for your help Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] How to force iscsi to see the new LUN size
- Original Message From: Peter Blajev pbla...@ucsd.edu To: CentOS Mailing List centos@centos.org Sent: Fri, January 15, 2010 10:34:47 PM Subject: [CentOS] How to force iscsi to see the new LUN size Hi, I increased the size of one of the LUNs and on CentOS 5.4 if I restart iscsi (`service iscsi restart`) I'll see the the new size but this will disconnect all other LUNs. I'm hoping that there is isciadm or some other command that will force iscsi to rediscover the LUNs but I can't seem to be able to come up with one. You can logout from that particular target and then login again iscsiadm --mode node --targetname target --portal portalip:3260 --logout iscsiadm --mode node --targetname target --portal portalip:3260 --login Hope this helps Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Problem with checkinstall
- Original Message From: Bob McConnell rmcco...@lightlink.com To: CentOS mailing list centos@centos.org Sent: Thu, January 14, 2010 10:44:59 AM Subject: [CentOS] Problem with checkinstall I installed checkinstall 1.6.2 on CentOS 5.4 VM (VMWare Server on WinXP). After getting the dependencies installed it compiled with no errors. But when I run it in its own source directory, I keep getting an error that I can't track down. The message is: install: cannot change ownership of '/usr/local/lib/installwatch.so': No such file or directory. But not only does the file exist, it has the correct permissions and creation time. I am running this as root. I did change the permissions on both make and install to 0755, but that did not help. The command line is: Is SELinux enabled? it sounds like the typical SELinux-related problem. what does getenforce say? check the output of ls -lZ /usr/local/lib/ to get the file's context Hope this helps Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] High load since passing from rhas3 to centos4.8
- Original Message From: fortin.pie...@bell.ca fortin.pie...@bell.ca To: centos@centos.org Sent: Thu, January 14, 2010 5:47:43 PM Subject: Re: [CentOS] High load since passing from rhas3 to centos4.8 The purpose of the server is to run NMS Telephony cards. The only support is for Centos 4.x on 32 bit systems. Anyway, since I have not found the trouble, it may still be there with another centos version. When I execute multiple ps during high load average period (above 10), here is the kind of output I have: ps aux | grep R USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 16295 0.0 0.0 3492 772 pts/1R+ 15:45 0:00 ps -aux root 16296 0.0 0.0 5400 648 pts/1S+ 15:45 0:00 grep R I see a lot of process in S, Sl, Ss+ and Ssl states. first of all, if you have high load average with seemingly low utilization, it may be because of load imbalance between CPUs and/or short bursts of lots of short cpu-intensive processes. Here's what I'd look at first: run vmstat 1 10 and look at the first column. if it's higher than 1/ncpu you're having cpu saturation. rum mpstat -P ALL 1 10, this gives you cpu utilisation per cpu (sar gives you the average among all processors) Also take a look at sar -q 1 10 to look at the CPU's queues sizes Hope this helps Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
