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more: Have install diskette for 3.0, but can't find the .img for 4.0
by Robert Moskowitz 19 Apr '05

19 Apr '05

I have found something called: diskboot.img at: http://www.gtlib.gatech.edu/pub/centos/4/os/i386/images/ But it is 6Mb large (6411Kb) instead of 1411Kb And the rawreadwrirewin program gets an error on it when run on NT. On Win2000, it makes a diskette that fails to boot.. So really, HELP!!!! I 'just' discovered that my old bootable diskette is for Centos 3.0, and my other CDs are Centos 3.3. ================================================================ OK. I am in an emergency crunch. I need that 4.0 install diskette. Like 2 hours ago! Where is it???????? I don't want to have to install 3.0 on this box. Illegitimi non Carborundum

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PCMCIA not working on IBM Thinkpad r40
by Joe Harb 19 Apr '05

19 Apr '05

I am running Centos 4 on a Thinkpad r40 and it does not see any pcmcia cards. I know the socket is good because I had it working with Fedora Core 3. A funny thing though, once I updated my fedora kernel to a certain rev. (don't remember the version) the card socket no longer worked. Going back to an un-upgraded install of Fedora 3 worked. Has anyone seen this problem and worked this out with Centos? Joe

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spread the word
by donavan nelson 18 Apr '05

18 Apr '05

I'm going to disassociate from the whiteboxlinux domains... http://whiteboxlinux.net/news.php

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Re: [CentOS] Serial ATA hardware raid.
by C.M. Connelly 18 Apr '05

18 Apr '05

"f" == franki <franki(a)htmlfixit.com> f> My main wholesaler sells Adaptec stuff, and I can get this f> one: f> http://www.techbuy.com.au/products/34526/I_OCARDS_HARDDRIVECONTROLLERS/Adap… f> For $450 it is a 4 port controller and has onboard 64MB ECC f> cache. I have one of these (it's in my mirror box). It's okay. It's not stunning, and I lost the array once (due to a bad drive and loose connectors more than the card). It runs under CentOS 3 without special drivers, but Adaptec also has some driver software (not sure whether it's newer or not -- it's ``minimally tested'' according to them). I also have an Adaptec 1210SA (two-port SATA), which is running under Debian with a custom kernel as I couldn't get it working (at all) under CentOS at the time I was building the machine. That card is a complete POS -- forget about hardware RAID, but it works okay with software RAID. If I had it to do over again, I would definitely go with 3Ware cards over the Adaptec cards. What you might save in money isn't worth the hassle. Claire -- *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Claire Connelly cmc(a)math.hmc.edu Systems Administrator (909) 621-8754 Department of Mathematics Harvey Mudd College *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

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php mysql pronblem with server
by Gerald Waugh 18 Apr '05

18 Apr '05

Hi, I have a problem installing a minimal server configuration, with php and mysql. Seems like no matter what I try I never get a /usr/lib/php4/mysql.so. /usr/lib/php4 only has; ldap.so I installed on a workstation with "Everything" and I see /usr/lib/php4/ as; domxml.so gd.so imap.so ldap.so mbstring.so mysql.so ncurses.so odbc.so pgsql.so snmp.so xmlrpc.so TIA Gerald

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Re: [CentOS] Serial ATA hardware raid.
by Bryan J. Smith 18 Apr '05

18 Apr '05

From: Pasi Pirhonen > This is as good insertion point as anything else, > for what i am going to say. > 3ware is working like a champ, but slowly. > The tuning won't make it magically go over 100MB/s sustained writes. I am bumping up against 100MBps on my bonnie write benchmarks on an older 6410. Now that's in RAID-0+1, and not RAID-5. > Random I/O sucks (what i've seen) for any SATA-setup. It depends. "Raw" ATA sucks for multiple operations because it has no I/O queuing. AHCI is trying to address that, but it's still unintelligent. 3Ware queues reads/writes very well, and sequences them as best as it can. But it's still not perfect. > Even for /dev/mdX. Now with MD, you're starting to taxi your interconnect on writes. E.g., with Microcontroller or ASIC RAID, you only push the data you write. With software (including "FRAID"), you push 2x for RAID-1. That's 2x through your memory, over the system interconnect into the I/O and out the PCI bus. When you talk RAID-3/4/5 writes, you slaughter the interconnect. The bottleneck isn't the CPU. It's the fact that for each stripe, you've gotta load from memory through the CPU back to memory - all over the system interconnect, before even looking at I/O. For 4+ modern ATA disks, your talking a roundtrip that costs you an aggregate percentage of your system interconnect time beyond 30%+. On a dynamic web or other CPU computational intensive server, it matters little. The XOR operations actually use very little CPU power. And the web or computational streams aren't saturating the interconnect. But when you are doing file server I/O, and the system interconnect is used for raw bursts of network I/O as much as storage, it kills. > Puny oldish A1000 can beat those with almoust factor of ten for random I/O, but being limited to > max. 40MB/s transfers by it's interface (UW/HVD). Or more like the i960 because, after all, RAID should stripe some operations across multiple channels. > But what i am going to say is that for my centos devel work > (as in my NFS-server), i just recently moved my 1.6TB raid under /dev/md5 with > HighPoint RocketRaid1820. > I don't care that NOT being hardware RAID. > The /dev/mdX beats the 3ware 9500S-8 formerly used hands down when you > do have 'spare CPU cycles to let kernel handle the parity operations'. It has nothing to do with CPU cycles but interconnect. XOR puts no strain on modern CPUs, it's the added data streams being feed from memory to CPU. Furthermore, using async I/O, MD can actually be _faster_ than hardware RAID. Volume management in an OS will typically do much better than a hardware RAID card when it comes to block writes. Of course the 9500S is still maturing. Which is why I still prefer to use 4 and 8 channel 7506/8506 cards with RAID-0+1. Even the AccelATA and 5000 left much to be desired before the 6000 and latter 7000/8000 series.

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mod_authz_svn anyone?
by Howard Fore 18 Apr '05

18 Apr '05

Hey, Anyone know where I can find the Apache module mod_authz_svn? I'm trying to setup a subversion repository and would like to use that module for the authentication. yum doesn't find anything. Thanks. -- Howard Fore, howard.fore(a)gmail.com

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Software RAID on CentOS 4
by centos.org_list＠000a.com 18 Apr '05

18 Apr '05

All this talk about SATA RAID in the past few days made me wonder... about possibly using software RAID, or at least trying it on my own workstations and eventually production servers, after I learn more about it. So, I started googling for tutorials and manuals, and there are usually two kinds I can find: 1. very basic "what is software RAID", or 2. complete 400+ page books on the topic sold at Amazon.com Nothing in between. :-( Does anyone know of a good resource where I could read up more on it, from properly setting up boot drives (and mirroring boot partitions to second drive in RAID-1 config), to setting up swap partition, to best practices, caveats, etc. All these articles usually also lack any kind of disk/data recovery info, procedures for detecting and swapping failed drives, etc. I'm mostly interested in simple RAID-1 for redundancy - just 2 drives per system, that's all. Typically on my hardware RAID boxes I set up a /boot, swap and / partitions, and would like to do the same using software RAID - again, with the ability to have a fully working boot partition and complete filesystem in case the main drive fails. Thanks for any pointers, whether online or off. I'm not adverse to buying a 400+ page book if it covers all this, but the books I came across so far had pretty bad reviews and lacked data recovery altogether, which would make them rather useless. Chris

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inotify on rhel systems?
by Collins Richey 17 Apr '05

17 Apr '05

I just read an interesting article caleed "Monitor Linux file system events with inotify.", see http://www-128.ibm.com/developerworks/linux/library/l-inotify.html?ca=dgr-l…. I notice that /dev/inotify is not present on my CentOS4 system, so the necessary kernel patches are probably not present. Does anyone know if there are any plans afoot to provide this functionality for rhel systems? -- Collins When I saw the Iraqi people voting three weeks ago, 8 million of them, it was the start of a new Arab world.... The Berlin Wall has fallen. - Lebanese Druze leader Walid Jumblatt

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CentOS4 upgradeany hangs while loading sata_via
by Norbert Kiesel 17 Apr '05

17 Apr '05

Hi, I have a machine running under CentOS 3.4 which I want to upgrade to CentOS 4. I booted using the CentOS 4 CD1 using "linux upgradeany". Problem is that loading sata_via never terminates. Ismod shows the sata_via module in state "Loading" while all others are in state "Live". The dmesg output shows that the module gets loaded, sees two disks, then prints info about the first one and is stuck there. I can of course provide the exact output if needed, but I would have to write it down by hand as the machine has no floppy and I can't write to the hard disk :-( Any ideas? I fear that if I just upgrade through yum, the machine won't boot afterwards. As this is one of our production DB machines, I'd rather not do that. Would compiling a kernel on my own with a newer version of sata_via and using that module be something worth trying? Best, Norbert

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