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Re: [CentOS] [CentOS-devel] disk i/o stalls with mptsas since upgrade to centos 5.4
by Ross Walker 17 Mar '10

17 Mar '10

On Mar 16, 2010, at 3:43 AM, Lennert Buytenhek <buytenh(a)wantstofly.org> wrote: > Hi! > > On two different machines, I've been experiencing disk I/O stalls > after > upgrading to the CentOS 5.4 kernel. Both machines have an LSI 1068E > MPT SAS (mptsas) controller connected to a Chenbro CK13601 36-port SAS > expander, with one machine having 16 1T WD disks hooked up to it, and > the other having a mix of about 20 WD/Seagate/Samsung/Hitachi 1T and > 2T > disks. > > When there's a disk I/O stall, all reads and writes to any disk behind > the SAS controller/expander just hang for a while (typically for > almost > exactly eight seconds), so not just the I/O to one particular disk > or a > subset of the disks. The disks on other (on-board SATA) controllers > still pass I/O requests when the SAS I/O stalls. > > I hacked up the attached (dirty) perl script to demonstrate this > effect > -- it will read /proc/diskstats in a tight loop, and keep track of > which request entered the request queue when, and when it completed, > and > it will WTF if a request took more than a second. (The same thing can > probably be done with blktrace, but I was lazy.) New requests get > submitted, but the pending ones fail to complete for a while, and then > they all complete at once. > > This happens on kernel-2.6.18-164.11.1.el5, while reverting to the > latest CentOS 5.3 kernel (kernel-2.6.18-128.7.1.el5) makes the issue > go > away again, i.e. no more stalls. > > It doesn't seem to matter whether the I/O load is high or not -- the > stalls happen even under almost no load at all. > > Before I dig into this further, has anyone experienced anything > similar? > A quick google search didn't come up with much. I would use iostat -x and see if there is a disk or group of disks that show abnormal service times and/or utilization. Are there any errors in the logs? How are the disks configured? Software raid? Is the adapter's firmware at the latest revision? Was .128 kernel running stock drivers?Is .164 kernel running stock drivers? (maybe weak-updates from .128 kernel?) What IO scheduler is this? Default CFQ? I would move this discussion to 'CentOS Users' as that is the more appropriate list for this. -Ross

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APIC error on Intel Atom CPU, CentOS 5.x
by Bill Campbell 17 Mar '10

17 Mar '10

I am seeing ``APIC error on CPU3: 60(60)'' warnings from dmesg periodically on a CentOS 5.4 box, kernel 2.6.18-164.11.1.el5. The CPU is an Intel(R) Atom(TM) CPU 330 @ 1.60GHz. I am not a hardware type, and don't have a clue what this means. This is occurring while an rsync-3.0.4 process is receiving data sent by a machine running rsync-3.0.7 (I just updated the CentOS box to rsync-3.0.7 since noticing that it was a bit dated). This is the only significant load on this machine at this time. This machine has locked up requiring a hard reset twice while this rsync process has been running at night with no problems at other times. Any suggestions? Thanks. Bill -- INTERNET: bill(a)celestial.com Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way Voice: (206) 236-1676 Mercer Island, WA 98040-0820 Fax: (206) 232-9186 Skype: jwccsllc (206) 855-5792 It is better to die on your feet than to live on your knees! -- Emiliano Zapata.

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cpuspeed CentOS 5.4
by MOKRANI Rachid 17 Mar '10

17 Mar '10

Hi, cpuspeed did not start on all my systems. CentOS 5.4 x86_64 /etc/init.d/cpuspeed start (nothing happen) Something is missing ? Thanks in advance for any idea. Regards __________________________ Ce message (et toutes ses pièces jointes éventuelles) est confidentiel et établi à l'intention exclusive de ses destinataires. Toute utilisation de ce message non conforme à sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'IFP décline toute responsabilité au titre de ce message. This message and any attachments (the message) are confidential and intended solely for the addressees. Any unauthorised use or dissemination is prohibited. IFP should not be liable for this message. Visitez notre site Web / Visit our web site : http://www.ifp.fr __________________________

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CPU Upgrade
by Kevin Kempter 17 Mar '10

17 Mar '10

Hi all; I have a Dell 2900 with a single Quad core chip and an expansion slot for a second Quad core chip. I have CentOS 5.4 installed on the server now. If I add the second Quad core chip do I need to change anything per the install? Do I have to re-install the OS? Or will CentOS simply see the second chip once I reboot and just work? Thanks in advance

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fuse filesystem mount issue
by fred smith 17 Mar '10

17 Mar '10

Hi! I'm using the ntfs-3g module for my portable USB hard drive on Centos 5.4. When I plug it into my centos box it mounts fine, but its owned by root and nobody but root has permission to write to it. I've been perusing the ntfs-3g and fuse man pages (and other docs) and they all seem to say that the default settings should be to allow RW access to everyone. but that isn't what I'm getting. Mount says this: /dev/sdd1 on /media/SeagateUSB type fuseblk (rw,noexec,nosuid,nodev,allow_other,default_permissions,blksize=4096) but right-click/properties on the desktop icon shows no write permission if yer not root: onwer: root, group: root, and all the "folder access" lines are greyed out. How would one approach solving this problem? Thanks! -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- The Lord detests the way of the wicked but he loves those who pursue righteousness. ----------------------------- Proverbs 15:9 (niv) -----------------------------

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Unable to remove interface (5.4)
by Jason Gates 16 Mar '10

16 Mar '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 So here is my problem: I'm unable to remove an interface on CentOS 5.4 (/etc/init.d/network restart keeps enabling it again) Background: The system had several interfaces set (eth0 eth0.6 eth0.7 eth0.8) 1.) I added a test interface...eth0.9 2.) but later deleted the /etc/sysconfig/network-scripts/ifcfg-eth0.9 file (since i no longer needed it) 3.) I then did ifconfig eth0.9 down 4.) I then setup eth0.7 with the same IP address settings that eth0.9 had. 5.) Upon a restart of /etc/init.d/network all the interfaces come up including eth0.9 This obviously causes a problem...are there any recommendations how to remove this "deleted" interface? Many thanks! Side note: rebooting the computer isn't an option. - -Jason -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) iEYEARECAAYFAkuf6LoACgkQ3BaZWzk6Q2eVugCg1gi6W19J9F2UTKyA+3nPVWqk evwAniLKv2Vx4qZI7ITZC4wZ+AJ2Vj5A =Mvtr -----END PGP SIGNATURE-----

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Whether need to run CentOS Certification test suite to get the CentOS logo
by zhang hualan 16 Mar '10

16 Mar '10

Howdy, I have searched related information on the CentOS website, and only get the answer "Except for CentOS CD/DVD ISOs, you may not use CentOS logos on merchandise without an individual agreement with the CentOS Project.We need to approve the use of the logos and will require that you donate a percentage of your total sales on items using the CentOS logos in this manner". But I'm still not sure whether CentOS have certification test suite and we need to run it first, such as we can get Redhat "hardware certified logo" if we pass the RedHat Certification test suite,eg V7. Thanks for your attention Donna

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How can I access a ZIP file that's over 2Gb?
by Stephen Harris 16 Mar '10

16 Mar '10

I have a zip file. It is over 2Gb in size: -rw-r--r-- 1 sweh sweh 2383956582 Mar 13 13:44 test.zip The standard "unzip" program barfs: % unzip -l test.zip Archive: test.zip End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. unzip: cannot find zipfile directory in one of test.zip or test.zip.zip, and cannot find test.zip.ZIP, period. This is because the info-zip utilities can't handle ZIP files over 2Gb in size. Windows can access it just fine. Anyone have any recommendations on a unix tool that'll let me access these large files? -- rgds Stephen

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help fdisk and dd
by chloe K 16 Mar '10

16 Mar '10

Hi all What is the best practice to remove all data in the disk? ls fdisk ok or use dd Can data be recovered? and what is the dd command? Thank you __________________________________________________________________ Looking for the perfect gift? Give the gift of Flickr! http://www.flickr.com/gift/

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mailman and postfix on CentOS
by David Mehler 15 Mar '10

15 Mar '10

Hello, I'm trying to get postfix and mailman going on CentOS 5.4. I had this working previously, six to eight months ago, and shut it down since the need for use was no longer there. I've now reactivated mailman and set up a list. The software versions I'm using are httpd 2.2.14, postfix 2.3.3, and mailman 2.1.9. All the services are started, the list is created, and email is sent to the list owner. The problem is reply addresses for subscriptions are being sent to mailman(a)domain.com rather than mailman(a)lists.domain.com as i want. In the email all the email addresses point to mailman(a)lists.domain.com except for the reply to header that goes to as i said mailman(a)domain.com. The lists.domain.com is a subdomain dedicated to the mailing list.The mailman newlist command correctly creates list aliases in /etc/mailman/aliases file. Any ideas? Thanks. Dave.

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