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LVM performance with snapshots
by t m 14 Mar '07

14 Mar '07

I've been experimenting with LVM and snapshots under Centos 4.4 recently, and have found performance to be horrible while a snapshot of a logical volume exists. I expected some performance degradation with a snapshot in place due to my understanding of the copy-on-write behavior, but my system becomes almost unusable when writing to my system with a snapshot in place. For example, I can write a 4 gigabyte file in about 16 seconds with no snapshots in place, but the same file either takes about 4 minutes to write, or my systems seems to hang when a snapshot exists. The top and iostat commands seem to show very high iowait times and very low actual I/O throuhput, and pdflush seems to be quite busy doing something. Removing the snapshot immediately brought performance back to normal. Are LVM snapshots not recommended with Centos, or are there recommended ways to tune it for better performance? Thanks for any input!

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Bind configuration
by Devraj Mukherjee 14 Mar '07

14 Mar '07

Hi everyone, I know this is probably the wrong forum to ask this question, but is there someone who has a working BIND configuration file that they are willing to share. Thanks. -- "I never look back darling, it distracts from the now", Edna Mode (The Incredibles)

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What is the stack size?
by Robert Moskowitz 14 Mar '07

14 Mar '07

I am installing the hsfmodem drivers for my ALI 5457 softmodem from http://www.linuxant.com/drivers/hsf/full/downloads-rhel40-i686.php The following warning is supplied: *Note:* The default stack size in original Red Hat Enterprise Linux 4.0 kernels is only 4K. Because some drivers require more stack space to operate properly, we recommend using a kernel with a larger stack size if you experience problems or crashes. You can either rebuild your own custom kernel, or *get one of our replacement "stk16" kernels provided for your convenience* <http://www.linuxant.com/drivers/hsf/full/downloads-rhel40-kernel-i686.php>. They are identical to the Red Hat kernels, except that the stack size was increased to 16K. I ASSuME that Centos 4 also has a 4K stack? Should I increase my stack size to 16K and if so, how?

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How to enable mysql support on php 5
by Ern jura 14 Mar '07

14 Mar '07

I am using php 5.1.6 and mysql 5.0 on 4.3 centos on running phpinfo mysql is shown as not supported how can I enable mysql support on php 5

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Problem with Promise Ultra100 controllers & 2.6.9-42 kernel
by Lee Parmeter 14 Mar '07

14 Mar '07

When I boot my Centos home file server with the latest kernel, 2.6.9-42.0.10.EL, the two Promise controllers installed in the system are unable to enable the 2nd IDE Channel on both cards due to a memory conflict. The error indicates that the next block of memory is already allocated. So the 2nd IDE channel on each card does not get enabled. Listing of the two controllers is below: 00:09.0 Mass storage controller: Promise Technology, Inc. PDC20267 (FastTrak100/Ultra100) (rev 02) 00:0a.0 Mass storage controller: Promise Technology, Inc. PDC20268 (Ultra100 TX2) (rev 02) Looking at "config-2.6.9-42.0.10.EL", the driver is enabled and compiled into the kernel. Both IDE channels on both controllers are enabled OK on the previous installed kernel which is 2.6.9-34.0.1.EL. Kernels before did not exhibit the current problem either. Anyone seen a similar problem or aware of a remedy? Any assistance would be appreciated. -Lee ____________________________________________________________________________________ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains. http://farechase.yahoo.com/promo-generic-14795097

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centos 5 beta and xen
by Jerry Geis 14 Mar '07

14 Mar '07

>>Jerry Geis wrote: >>/ Hey I was wanting to play with xen on beta 5. />>/ I have the beta 5 installed in my turion laptop. Went smooth... (4.4 />>/ would not install) />>/ />>/ Anyway anyone know were a starting point with xen might be?> / >Have you bothered RTFM'ing a bit ? >- KB Well karanbir, I have bothered looking for one... Thank you for asking so nicely. I downloaded the ISO. I obviosuly installed the beta, I tried man xen, whereis xen... I launched firefox thinking the first page might have a link to a manual, etc... but no... Earlier when I tried to read the release notes I got a page cannot be displayed.... I tried doing "yum install xen" which resulted in a hung yum. So yes I have tried a number of things - but I did not find anything. Have a great day! Jerry

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[CentOS5beta] kernel crash due to a known bug
by Akemi Yagi 14 Mar '07

14 Mar '07

After a successful installation of CentOS5 beta, I "successfully" crashed the system twice already. This is caused by a known bug in the cifs kernel module. The patch became available in January: http://www.kernel.org/git/?p=linux/kernel/git/sfrench/cifs-2.6.git;a=commit… FC5 and FC6 are running the patched kernel but, unfortunately, RHEL5 will not. Steve Dickson of RedHat says: "I will not be able to get these in the initial RHEL5 release, since that is currently lock down... very tightly... so I will try to get them in early in the 5.1 pool..." I am wondering...if it is possible for the CentOS team to apply the patch ahead of the upstream. Or I would have to wait for CentOS5.1? In that case, I will need to compile the cifs module with the patched file. Akemi

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A request for your input.
by lmth＠deakin.edu.au 14 Mar '07

14 Mar '07

Hello My name is Lara Thynne and I am a PhD candidate at Deakin University Australia. I am currently researching the boundary between work and leisure activities directly related to the open source community and open source program development. As part of this I am running a survey at the following address. https://dcarf.deakin.edu.au/surveys/oss/ The survey is completely confidential and looks at your views and motivations to use Open Source software and to participate in the community. It will only take a five to ten minutes to complete and your contact details will not be recorded. You can withdraw your participation at any stage. I sincerely apologize for the spammish nature of this e-mail - I don't mean to abuse this list. I am trying to collect responses from as many open source developers and users as possible and a mailing list like can be the only way to reach many developers. Thanks again Lara P.S The program that I am using is open source, of course (www.phpsurveyor.org)

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Re: [CentOS-announce] CentOS 5 (Beta) for i386 and x86_64 is released
by Martin Marques 14 Mar '07

14 Mar '07

All the links in beta.centos.org give a: AccessDenied You are not authorized to access this page. Is there some place else where we can get a copy of the beta? Johnny Hughes wrote: >The CentOS development team is pleased to announce the release of CentOS >5 (Beta) for i386 and x86_64. > >It is available via beta.CentOS.org mirrors and bittorrent. > >This release corresponds to the upstream vendor EL5 beta2 release. > >NOTE: This software is BETA and should be treated as such. It is for >testing purposes only. Please ensure it meets your needs completely >before using in a production environment. > >============================================================ > >Please see the CentOS specific release notes here: >http://beta.centos.org/centos/5/os/i386/RELEASE-NOTES-en.html > >CentOS specific release notes talk about changes in the CentOS RPMS as >compared to upstream, etc. > >============================================================ > >The upstream release notes can be viewed at: > >i386: >http://beta.centos.org/centos/5/os/i386/NOTES/RELEASE-NOTES-en.html > >x86_64: >http://beta.centos.org/centos/5/os/x86_64/NOTES/RELEASE-NOTES-en.html > >for other languages, see: >http://beta.centos.org/centos/5/os/i386/NOTES/ >http://beta.centos.org/centos/5/os/x86_64/ > >============================================================ > >Documentation and a deployment guide are available here: > >http://www.centos.org/docs/5/ > >============================================================ >ISOs may be downloaded here (DVD is currently available only as a >Bittorrent download): > >http://beta.centos.org/centos/4.92/isos/ > >ISOs may also be purchased from some of our official vendors: > >Has ISOs now: >www.cheeplinux.com > >Official Vendors page {Others there may have CentOS 5 (Beta) soon}: >http://www.centos.org/vendors/ > >============================================================ > >Bugs may be reported at: > >http://bugs.centos.org/ > >============================================================ > >To stay current with CentOS: > >Visit our website at http://www.centos.org > >Join the CentOS mailing list at: >http://lists.centos.org/mailman/listinfo/centos > >Join various team members on IRC at irc.freenode.net #centos > >Enjoy, > >The CentOS Development Team > > >------------------------------------------------------------------------ > >_______________________________________________ >CentOS-announce mailing list >CentOS-announce(a)centos.org >http://lists.centos.org/mailman/listinfo/centos-announce > > -- 21:50:04 up 2 days, 9:07, 0 users, load average: 0.92, 0.37, 0.18 --------------------------------------------------------- Lic. Martín Marqués | SELECT 'mmarques' || Centro de Telemática | '@' || 'unl.edu.ar'; Universidad Nacional | DBA, Programador, del Litoral | Administrador ---------------------------------------------------------

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CentOS 5 (Beta) for i386 and x86_64 is released
by Johnny Hughes 13 Mar '07

13 Mar '07

The CentOS development team is pleased to announce the release of CentOS 5 (Beta) for i386 and x86_64. It is available via beta.CentOS.org mirrors and bittorrent. This release corresponds to the upstream vendor EL5 beta2 release. NOTE: This software is BETA and should be treated as such. It is for testing purposes only. Please ensure it meets your needs completely before using in a production environment. ============================================================ Please see the CentOS specific release notes here: http://beta.centos.org/centos/5/os/i386/RELEASE-NOTES-en.html CentOS specific release notes talk about changes in the CentOS RPMS as compared to upstream, etc. ============================================================ The upstream release notes can be viewed at: i386: http://beta.centos.org/centos/5/os/i386/NOTES/RELEASE-NOTES-en.html x86_64: http://beta.centos.org/centos/5/os/x86_64/NOTES/RELEASE-NOTES-en.html for other languages, see: http://beta.centos.org/centos/5/os/i386/NOTES/ http://beta.centos.org/centos/5/os/x86_64/ ============================================================ Documentation and a deployment guide are available here: http://www.centos.org/docs/5/ ============================================================ ISOs may be downloaded here (DVD is currently available only as a Bittorrent download): http://beta.centos.org/centos/4.92/isos/ ISOs may also be purchased from some of our official vendors: Has ISOs now: http://www.cheeplinux.com/ Official Vendors page {Others there may have CentOS 5 (Beta) soon}: http://www.centos.org/vendors/ ============================================================ Bugs may be reported at: http://bugs.centos.org/ ============================================================ To stay current with CentOS: Visit our website at http://www.centos.org Join the CentOS mailing list at: http://lists.centos.org/mailman/listinfo/centos Join various team members on IRC at irc.freenode.net #centos Enjoy, The CentOS Development Team _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce

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