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Linux World Expo - London 25th + 26th Oct 2006
by Dag Wieers 22 Oct '06

22 Oct '06

Hi, Is anyone else coming to help us out ? Even for half or one day ? Kind regards, -- 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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CentOS 3 - I/O performance with Promise HW RAID
by Bart Schaefer 21 Oct '06

21 Oct '06

(Suggestions for other forums in which to post this question are welcome.) We have CentOS 3.6 x86_64 running on a server with dual 2.2GHz Opterons and a Promise UltraTrak RM8000 connected via an Adaptec SCSI card. We are seeing what seems to be gradual I/O performance degradation over time; it seems to be OK for up to about 90 days, but not long after that both CPUs end up continuously spending 50-99% of their time in "iowait" state when reading/writing the RAID device, and processes begin to be stuck for minutes at a time in disk wait state, until finally the server becomes unusable. A simple reboot, even with a forced fsck, does NOT clear this up, but a full shutdown followed by power cycling the RAID device and then rebooting, seems to return things to normal. After doing some research when this most recently happened, we have used elvtune to lower the read and write latency on /dev/sda4 (which is the primary filesystem on the RAID) to 128 and 256 respectively. However, we don't yet know whether this will make any difference, as it has only been 48 hours since the power cycle and it usually takes months for the problem to become noticable. I'd like to get out ahead of it this time if I can, so that we either know when to schedule a power cycle or have some confidence that we won't need to. Any information would be appreciated. (Below this point is just hardware data in case it is helpful.) Some data from "lshw": description: Motherboard product: GT24-B2891 vendor: TYAN Computer Corp physical id: 0 slot: H1 L1 Cache The SCSI card: description: SCSI storage controller product: AIC-7892A U160/m vendor: Adaptec physical id: 8 bus info: pci@09:08.0 logical name: scsi0 version: 02 width: 64 bits clock: 66MHz capabilities: scsi bus_master cap_list scsi-host configuration: driver=aic7xxx latency=72 maxlatency=25 mingnt=40 resources: ioport:3000-30ff iomemory:df300000-df300fff irq:24 /proc/cpuinfo: processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 5 model name : AMD Opteron(tm) Processor 248 physical id : 255 siblings : 1 stepping : 10 cpu MHz : 2210.197 cache size : 1024 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow bogomips : 4404.01 TLB size : 1088 4K pages clflush size : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 5 model name : AMD Opteron(tm) Processor 248 physical id : 255 siblings : 1 stepping : 10 cpu MHz : 2210.197 cache size : 1024 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow bogomips : 4404.01 TLB size : 1088 4K pages clflush size : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp

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CentOS 3.8 Kernel Update with NVIDIA Video Card
by Corwin Burgess 21 Oct '06

21 Oct '06

I need some advice. I updated the kernel but when I restarted my computer I got the following error message: -- I cannot start the X server (your graphical interface). It is likely that it is not set up correctly. ... Failed to load the NVIDIA kernel module! -- I've started my computer using the old kernel. I found out that there's a new nvidia driver so I will also update it. I've downloaded this driver. I can think of two ways to solve this problem but I'd rather have some expert advice. What's the best way to boot with the new kernel, install the nvidia driver and of course update the NVIDIA kernel module? Thanks in advance, Corwin Burgess

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centos and apache DOS question
by Tom Diehl 21 Oct '06

21 Oct '06

Hi, I have a centos 4.4 box running Apache serving up web pages. One of my customers has a marketing firm that once a week pulls all of the content so that they can do their thing. When they do this the box stops serving web pages. The load goes to 0.0 and top shows almost no memory free. The box does not swap nor do I get OOM to kick in. Normally the box has about 20-30 httpd processes running but when they are pulling the whole web site I see about 255 httpd processes. If I kill the httpd processes then top shows the load immediately spiking to over 30 and then coming back down to normal. The box is a 3.2 gig P4 with 2 gigs of memory in it. Normally top shows it has 300-400 megs free, with about 300 megs in buffers. I can have the marketing company throttle their downloading of the web site but I think that is the wrong answer. I would like to fix the real cause of the problem. Does anyone know what is going on here or how to troubleshoot this? Is there some kind of tuning I am supposed to be doing to prevent this kind of thing? Do I need more memory? Any help would be appreciated including pointers to docs on this type of thing. So far I have been unsuccessful in finding the correct google incantation to help explain this. Regards, -- Tom Diehl tdiehl(a)rogueind.com Spamtrap address mtd123(a)rogueind.com

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UK Linux & Open Source Awards 2006
by Johnny Hughes 21 Oct '06

21 Oct '06

The UK Linux & Open Source Awards for 2006 will be hosted on Wednesday 25 October 2006 at the Millennium Gloucester hotel, Kensington: http://www.linuxawards.co.uk/ The CentOS Project would like to thank all our CentOS users (especially the readers who picked CentOS as their favorite distribution) for getting CentOS in the top 3 (short-list) of all Linux Distros (with Ubuntu and SUSE). http://www.linuxawards.co.uk/index.php?option=com_content&task=view&id=14&I… Whether we finish 1, 2, or 3 with respect to this award, we are honored to be there. ----------------------------------- This is another top 3 showing when the users are asked which Linux Distribution is best. CentOS also finished 2nd in the (behind Ubuntu) in the 2005 Linux Journal Readers' Choice Awards: http://www.linuxjournal.com/article/8520 ----------------------------------- Again, we would like to take the time to thank our users who continually keep CentOS in the press and always keep CentOS in the top of the heap when user opinions (and not stuffed suits) determine the best Linux Distro. Thanks to All, Johnny Hughes

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Anyone use this OS as there webserver
by Samuel 21 Oct '06

21 Oct '06

Hi, If anybody uses CentOS as there own web-server and has a domain there using on it please tell me so I can check it out.

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How do I Install Java on CentOS 4
by Samuel 21 Oct '06

21 Oct '06

Hello, I have just successfully installed Cent OS Linux to my Dual Processor Machine, it will be operating as a web-server but i need to install it as local so I know how to set it up for the Internet but I can't Install Java and flash. Would anyone be able to help me Please? Yours Truly, Samuel Owner and Chief Technical Officer of Totally Equal Domain Service (Faction of The Perthes Foundation)

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file size limit in apache 2.0 on centos 4
by Tony Schreiner 21 Oct '06

21 Oct '06

I think I am encountering a download file size limit on centos 4 with httpd-2.0.52 The file in question is 5.2G in size, it does not show up in a browser directory listing, and I'm getting the error in the http error_log value too large for defined data type: access can someone confirm that there is a 4GB limit (or other) in the standard apache 2.0 on CentOS 4? Tony Schreiner Boston College

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RE: [CentOS] file size limit in apache 2.0 on centos 4
by Robert Becker Cope 20 Oct '06

20 Oct '06

"Brett Serkez" <bserkez(a)gmail.com> wrote: > The file size limitation is in the file system type, ext3 is the > default on CentOS. There are other file system types that can be used > in a partitiion, such as reiser, jfs, xfs, each with their own > attributes. This is not accurate. Apache is simply not compiled with large file support on CentOS systems. To change this would mean to break binary compatibility, so it is not likely to change until RHEL5 is released. Or something like that. robert

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MoinMoin rpm
by Bob Pierce 20 Oct '06

20 Oct '06

I see we are using MoinMoin on the CentOS wiki. Is there an rpm available for this? I'd like to install it on either a CentOS 3 or CentOS 4 system. Bob

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