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4653 discussions

Updated packages for kmod-gfs-xen
by carlopmart 02 May '07

02 May '07

Hi all, Where are kmod-gfs-xen updated package for kernel 2.6.18-8.1.1 and kernel 2.6.18-8.1.3?? ftp redhat site has published src packages ... Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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More XFS Filesystem Tips
by Joshua Kramer 01 May '07

01 May '07

Hello All, This was posted to the Postgres Admin list - it has some valuable tips wrt XFS usage. I haven't had time yet to see if the C5 kernel conforms to what Hannes is talking about, but it looks like XFS is *very* picky about having hardware working correctly (and raid arrays set up correctly). Cheers, -J ---------- Forwarded message ---------- Date: Tue, 01 May 2007 16:35:28 +0200 From: Hannes Dorbath <light(a)theendofthetunnel.de> To: Adam Witney <awitney(a)sgul.ac.uk>, pgsql-admin(a)postgresql.org Subject: Re: [ADMIN] File systems linux !!! Adam Witney wrote: > Could you give a couple of examples of things that could be done wrong? I > have XFS running for my data partition, but I didn't really do much when I > set it up... > > Thanks for any advice 1.) Don't run XFS on any hardware that's not proven to be 100% fsync/fua safe. It's extremely unforgiving in that regard. Double check your raid controller settings and then test with something like http://www.faemalia.net/mysqlUtils/diskTest.pl 2.) Don't run it with a 4K stacks kernel. Though most issues with 4k stacks have been fixed long ago, there is an 4k stack fix in 2.6.21 release notes yet again. I just wouldn't trust it 100% yet. Especially avoid to run with 4k stacks in production if you are used to stack block devices on top of each other (LVM, EVMS, DRBD, GNBD etc). 3.) Use the deadline I/O scheduler, anticipatory and XFS don't like each other. This is true for almost any FS != ext3. This makes a difference especially for OLTP. 4.) Don't use stripe alignment unless you are 100% sure on how to calculate that numbers for your raid setup. No stripe alignment is always better than a wrong alignment. Some controllers don't like it at all and degrade in performance. 5.) Make sure to use write barriers unless you run on a hardware controller with BBU. Actually this is XFS default these days, but it gets disabled if you have any block device in your stack that doesn't support it. An example is DRBD (though write barriers are on the road map) 6.) Flushing data is the sole responsibility of the application. XFS does nothing to help broken applications, like ext3 can do with data=ordered or data=journal. XFS uses writeback exclusively. Don't run anything that does not conform to ACID on XFS. This is fine for PostgreSQL, but might not be fine for all your applications. 7.) Check dmesg for XFS messages and be able to interpret them. Especially something about "CORRUPTED_GOTO". If you see such a line chances are high that 1.) is not true. This is a cry from XFS to run xfs_repair ASAP, the file system was only mounted to keep your box online and will shutdown immediately if any suspicious position is accessed. Take XFS messages serious and Google for them if your are not sure what they mean. 8.) Grab all those nice PDFs at http://oss.sgi.com/projects/xfs/training/index.html These are essential readings for any XFS admin. IMHO XFS is a mature and rock stable file system, however your really need to obey the things above. It's just not the general-purpose-mkfs-and-forget-FS like what ext3 is claimed to be. What I recommend for a PostgreSQL production box is to use ext3 data=journal for / and XFS for $PGDATA. This should give you a system which really behaves nice on power failures. ext3 data=journal for all non ACID applications, XFS for ACID applications. Personally I use XFS on / as well, but I have taken some steps to make it behave like I wish. -- Best regards, Hannes Dorbath ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend

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CensOS5-server
by Filip Bartmann 30 Apr '07

30 Apr '07

Will be released CentOS 5 Server and/or LiveCD? If yes, when will be available? Thanx, Filip Bartmann

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Re: [CentOS-devel] XFS module ... big troubles
by Gernot Stocker 29 Apr '07

29 Apr '07

On Tuesday 24 April 2007, Jim Perrin wrote: > Okay. Why are you rebuilding, rather than use the already compiled > version in the repository? Especially with such crucial things like kernel I like to be able to react on my own if there are arising security issues not fixed by the upstreram distro in time. Therefore I like the idea of at least beeing able to rebuild the kernel on my own if I have to. > While you should in theory be able to rebuild the module and have it work > just fine, sometimes there are issues with the build environment that are > difficult to track down. That's strange because we didn't change anything regarding the build environment. It is a plain Centos 5 installation from scratch using the DVD iso image. Beside some configuration regarding iptables and NFS service NOTHING was been changed. > > Do you get the same results with the precompiled modules? > I will try it tomorrow evening because we need the image server today for a bunch of new installations. Luckky us that ext3 is working ;-) As soon as the student rooms are installed I will test the precompiled module and come back to the list with the results. > I don't use xfs that extensively on i686 hardware because I don't > trust the 4k stack limitation issue, but a quick run-through with the > pre-built modules, and I don't seem to have this issue. (moved a > bunch of copies of the centos-5 dvd around, on and off the fs, > md5suming each time) That doesn't make me feel better ;-) We wanted to migrate a machine with almost 7000 user homes on XFS to CentOS 5 and I'm now a "little" bit scared unless we can't track down the problem. Thanks for your hints, Gernot -- Gernot Stocker, Institute for Genomics and Bioinformatics(IGB) Petersgasse 14, 8010 Graz, Austria Tel.: ++43 316 873 5345 http://genome.tugraz.at

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CentOS booth at LinuxTag 2007, Berlin, Germany
by Dag Wieers 28 Apr '07

28 Apr '07

Hi all, The CentOS team is preparing for LinuxTag 2007 on: Wed 30 May 2007 until Sat 2 June 2007 in Berlin, Germany We have a wiki page dedicated to LinuxTag 2007 at: http://wiki.centos.org/Events/LinuxTag2007 If you're interested to help out organising this event, subscribe to our new promo mailinglist at: http://lists.centos.org/mailman/listinfo/centos-promo And if you were planning to go to LinuxTag, please pay us a visit. We're very interested to meet and discuss future development and exciting new ideas. This is a perfect opportunity to connect CentOS team-members and CentOS users. Hope we can meet at LinuxTag 2007 ! -- dag wieers, dag(a)wieers.com, http://dag.wieers.com/ -- [all I want is a warm bed and a kind word and unlimited power]

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New mailing list: CentOS-Promo
by Ralph Angenendt 25 Apr '07

25 Apr '07

Ladies and Gentlemen, we, the CentOS Project, are proud to invite you to our newest mailing list: CentOS-Promo. This list is for the discussion of Events, Gatherings and (LUG)Meetings where CentOS will or should be presented. Should *you* join this mailing list? Yes, if - you want to help out at events - you want to present CentOS at your LUG - you have great ideas for marketing material to promote CentOS - you are interested in doing promotion for CentOS - you know about events where CentOS should be (re)presented - you want to invite CentOS developers to your LUG/Event (you want to pay travelling costs, don't you? >:) ) - you want to know where CentOS will be presented next So go ahead, subscribe to this list and help us spread the word! CentOS is good for you! We know we will see you on that mailing list soon. Just point your browser to <http://lists.centos.org/mailman/listinfo/CentOS-Promo> and join us! Be seeing you there, Ralph

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XFS module ... big troubles
by Gernot Stocker 24 Apr '07

24 Apr '07

Hi CentOS developers, first of all congrats for the CentOS 5 release! I'm using on several production servers xfs as file system and would like to migrate them from CentOS 4.4/FCx to CentOS 5. I tried for a low priority image server the module downloaded from the site below: http://dev.centos.org/centos/5/testing/SRPMS/xfs-kmod-0.3-2.2.6.18_8.1.1.el… The results have been completely destroyed image files. It was quite strange that small files remaind fine whereas bigger files auf more than 1GB have been destroyed. Has anybody else made similar experiences using this module? Any hints how this problems could be solved? Thanks Gernot -- Gernot Stocker, Institute for Genomics and Bioinformatics(IGB) Petersgasse 14, 8010 Graz, Austria Tel.: ++43 316 873 5345 http://genome.tugraz.at

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Building CentOS for Alpha/AXP and SPARC
by Martin P. Kalitis 23 Apr '07

23 Apr '07

Hello all, I originaly sent this email to Ralph Angenendt and he suggested posting it to the devel mailing list.I have had a look at the CentOS distro and noticed that you are looking for a maintainer for SPARC. Whilst I don't have access to a SPARC system as yet I do have access to an AXP (ALPHA) and noticed that the latest build/release you have for this platform is 4.3 and not 4.4 or 5. If you need extra resources to help make the newer releases happen for the AXP platform, I am more than willing to help out where I can. I work as a systems developer and have a background not only in development but also systems administration which includes building custom toolchains and embedded versions of Linux for various hardware platforms. Initially I can begin work on producing a AXP release with a SPARC release following once the hardware hits my doorstep. Let me know if you are interested in my offer. Thanks, Martin.

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bugs in an Spanish Instalation...
by Roger Peña 22 Apr '07

22 Apr '07

Hi centos dev If I chose to install centos5 in spanish, I found that some text are still in english, like in: 1- Software selection: first sentence "The default instalation of CentOS includes ...." texts in the rest of the page are in spanish though :-) 2- When selecting specific or individuals packages in one group (KDE group) the description of each package is in english, although the name of the groups packages are in spanish 3- In the Donation Slide, the title is in English . probabily this is our fault :-( because I could not see the title in the Artwork translation page: http://wiki.centos.org/ArtWork/rnotes/Translations#head-6310e1248c5e7bbd6bb… what should we do? update/fix the wiki page? thanks for give us this nice distribution :-) very good work cu roger __________________________________________ RedHat Certified Engineer ( RHCE ) Cisco Certified Network Associate ( CCNA ) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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How can I search in bugzilla.centos.org ?
by Roger Peña 22 Apr '07

22 Apr '07

Hi I was trying to find if someone reported a litle, very litle, bug in yum.conf file but I could not see how to make a search in centos bugzilla page :-( the litle bug is, probabily reported, that distropkg is set to redhat-release insted to centos-release, like this: distroverpkg=centos-release BTW, I am exploring centos5-x86_64 :-) I forgot to mention it in my previous mail also, it would be nice if anaconda fail more polite when it can't find 'groups definitions' in the repos files, right now it just make a break with a "send a bug report" messages and abort instalation. I know that should not happen but .... sometime do :-) I notice that when I try to make an instalation via http but creating the repos with creatrepo command in centos-4.4 (not using the dvd iso, just copying the rpms and creating the repo), I forgot to create the groups, so the instalations fail over and over againg until I realize what was the problem, sadly I had to go over and over again through all initial steps I know that is not a bug, just a RFE but ... thanks roger __________________________________________ RedHat Certified Engineer ( RHCE ) Cisco Certified Network Associate ( CCNA ) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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