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Re: [CentOS] CentOS Live?
by Bryan J. Smith <b.j.smith＠ieee.org> 11 May '05

11 May '05

From: Johnny Hughes <mailing-lists(a)hughesjr.com> > I was looking at that :) > Question is ... does it really serve a purpose? > The purpose of the distro is to install on servers and workstations. A > live CD doesn't do that. Knoppix is very good in this market, so I > think the usefulness is limited. Especially since there are already "Fedora Live" CDs anyway. One of the reasons for RHEL is for a fixed, integrated tested package set based on but beyond that of Fedora Core. If I want to start playing around with a "customized" Fedora-based distro, then I'm just going to go with Fedora itself, instead of RHEL (or CentOS). > BUT ... one good thing it would do is allow you an easy way to see if > your hardware works without downloading the whole shebang ... which is a > positive. "Fedora Live CDs" should do the same. Just line up the kernel version. > We may look at doing this after CentOS-4.1 is done and I have some of > the automated scripts working the way I want. The more CentOS would get away from RHEL, the more I'd just do my own configuration management from Fedora Core instead. I mean, I've built equivalent APT-RPM repositories of Fedora Core by lining up the packages. The reason why I like to use CentOS is so I don't have to do my own configuration management of Fedora Core to get the same thing of RHEL. It saves me a lot of effort. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Fwd: usb 2.0 hardware problem
by Michel Daggelinckx 11 May '05

11 May '05

---------- Forwarded message ---------- From: Michel Daggelinckx <03taxi(a)gmail.com> Date: May 11, 2005 11:43 PM Subject: usb 2.0 hardware problem To: CentOS discussion and information list <centos(a)caosity.org> i just installed a trust usb 2.0 card in my dell poweredge 2400 centos 3.4 detected the card and loaded all needed kernel modules after this the systeems slowed down to almost being unuseable. also it detects plugged in devices (usb thumbrive and samsung usb dvd writer) but doesn't allow acces (to thumbdrive) or just goes into error (samsung dvd writer). any ideas

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Re: [CentOS] SATA RAID on CentOS!
by Bryan J. Smith <b.j.smith＠ieee.org> 11 May '05

11 May '05

From: israel.garcia(a)cimex.com.cu > I want to install CentOS 4.0 on my new server (two SATA hdds, Intel 865 > mainboard), now, I want to configure a RAID 1 using this hardware..., my > question is: > 1. Setting up a RAID 1 on SATA hdds is different from a normal hdds > (PATA)? SATA channels are designed to be legacy compatible with software for legacy ATA channels, _unless_ you put them in Advanced Host Controller Interface mode. In AHCI, instead of individual I/O ports, the system presents a single device of up to 32 devices, along with some capabilities for each drive (e.g., native command queuing, NCQ). In legacy ATA mode, each drive is assigned a device. AHCI support varies in Linux right now (i.e., don't use yet!). True Hardware ATA RAID controllers provide queuing natively, since they are queuing with an on-board intelligence (microcontroller or ASIC), and not just a "dumb" interface to the drive. In essence, the "intelligence" moves from the driver to the on-board firmware, and the OS driver becomes "dumb" (and GPL as a result ;-). > 2. Is there some SATA RAID Linux Howto available? The same HOWTOs/documentation for LVM/MD applies regardless of ATA, SATA or SCSI when using software LVM and/or MD. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: [CentOS] Hewlett Packard Server support packs
by Bryan J. Smith <b.j.smith＠ieee.org> 11 May '05

11 May '05

From: Johnny Hughes <mailing-lists(a)hughesjr.com> > maybe /etc/issue and /etc/issue.net /etc/issue and /etc/issue.net are typically generated on Fedora-based systems in /etc/rc.d/rc.sysinit at boot-time using uname and/or /etc/*-release. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: [CentOS] Hardware RAID Controller
by Bryan J. Smith <b.j.smith＠ieee.org> 11 May '05

11 May '05

Lee W wrote > However I've noticed that it is a 64-Bit PCI Card. Can I still use this > in a 32-Bit Slot. I think that I read something once that said it would > work but at a reduced bandwidth. Joshua Baker-LePain wrote: >Page 16 of the Installation Guide says a 32bit slot is fine. From: Peter Farrow <peter(a)farrows.org> > I use one of my 8500-8s in a 32bit slot on an MSI Dual PIII > motherboard with no problems... Two things of note: 1) 66MHz capable cards The "6" in 7506 and 8506 indicate it is 66MHz capable. The 7500 (fka 7850) and 8500 are 33MHz capable, as are all prior models. All 7000/8000 series cards are 64-bit _except_ the 7000-2 (fka 7200) and 7006-2 (66MHz, but 32-bit). 2) Multiple PCI/PCI-X busses The most important consideration beyond bandwidth is the PCI bus. I have seen far too many people stick a 3Ware card into a system that has a _single_ 32-bit@33MHz PCI bus. Back in the 1999-2001 timeframe, I made a buttload of money just coming in and ripping out i440BX and i440GX mainboards and putting in ServerWorks ServerSet IIILE/HE mainboards for Pentium II/III systems. 3-4x performance is achievable by just getting the storage and NIC on separate PCI (or PCI-X) busses. Especially at today's disk transfer rates and GbE on the same system. [ SIDE NOTE: A good GbE card with 256KB SRAM and using 9000 byte jumbo frames also helps. ] -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: [CentOS] Re: Hardware RAID Controller -- not a "bug"
by Bryan J. Smith <b.j.smith＠ieee.org> 11 May '05

11 May '05

From: Joshua Baker-LePain <jlb17(a)duke.edu> > I'm in the midst of testing a dual 9500-12 based system, and I've got all > sorts of results (I posted tiobench numbers for XFS and ext3 recently). Until the Escalade 9500S series matures, I've been recommending the following: 3Ware Escalade 7506/8506 for RAID-10. 3Ware Escalade 7506/8506 for RAID-5 when it is largely a read-only setup. LSI Logic MegaRAID SATA 300-8X (XScale) for RAID-5. Unless you absolutely need the maximum disk efficiency of RAID-5, or you have 99% reads (e.g., typical MySQL Internet server), then RAID-10 is often far better than RAID-5. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Re: [CentOS] SATA RAID on CentOS!
by Bryan J. Smith <b.j.smith＠ieee.org> 11 May '05

11 May '05

From: Aleksandar Milivojevic <amilivojevic(a)pbl.ca> > I believe Intel 865 uses ICH5? If so, it is a sofware RAID emulation in > BIOS. You do not have RAID in hardware. It's just a marketing trick > that has nothing to do with reality. Exactomundo. Even AHCI is still software-driven. It is my sincerest hope that the term "FRAID" (or something else) catches on to describe this "Free RAID" / "trick BIOS" approach. -- Bryan J. Smith mailto:b.j.smith@ieee.org

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SATA RAID on CentOS!
by israel.garcia＠cimex.com.cu 11 May '05

11 May '05

I want to install CentOS 4.0 on my new server (two SATA hdds, Intel 865 mainboard), now, I want to configure a RAID 1 using this hardware..., my question is: 1. Setting up a RAID 1 on SATA hdds is different from a normal hdds (PATA)? 2. Is there some SATA RAID Linux Howto available? Thanks in advance israel

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Re: [CentOS] Software RAID on Centos 4 - new issue
by Bryan J. Smith <b.j.smith＠ieee.org> 11 May '05

11 May '05

From: Aleksandar Milivojevic <amilivojevic(a)pbl.ca> > MegaRAID drivers (and hardware they drive) doesn't have very bright > history. When it works, it works. When it doesn't work, you are simply > out of luck. From what you wrote, seems you belong in "out of luck" > category. > BTW, shouldn't MegaRAID cards be hardware RAID? Many are, but not all. The ones that do have an Intel IOP 8030# (i960-based) or 8032#/8033# (StrongARM/XScale-based). > If you configure RAID in card's BIOS, instead of using software RAID, > does it than work correctly? The BIOS is _only_ for 16-bit Int13h (interupt 13 hexadecimal) services. I.e., boot-time and DOS (including DOS7 aka Win9x/Me in "compatibiltiy mode"). The presence of a BIOS does _not_ mean it's "hardware" RAID. In fact, that's how 98% of the "FRAID" cards work -- totally _useless_ once a 32/64-bit kernel boots. -- Aleksandar Milivojevic <amilivojevic(a)pbl.ca> Pollard Banknote Limited Systems Administrator 1499 Buffalo Place Tel: (204) 474-2323 ext 276 Winnipeg, MB R3T 1L7 _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos -- Bryan J. Smith mailto:b.j.smith@ieee.org

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Yum repomd.xml error
by Alex White 11 May '05

11 May '05

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 List, I searched google for this error, but apparently I'm either lacking the necessary 1337 skillz, or you know I just am not gettin' a google friendly search put into it. The error is below. [prata@crane ~]# sudo yum update Setting up Update Process Setting up Repos http://apt.sw.be/redhat/el4/en/i386/dag/repodata/repomd.xml: [Errno 4] IOError: HTTP Error 304: Not Modified Trying other mirror. Cannot open/read repomd.xml file for repository: dag failure: repodata/repomd.xml from dag: [Errno 256] No more mirrors to try. Has anyone else received this error? Did I perhaps miss an announcement? I looked about the list, but nothing regarding this was apparent to me. TIA - -- Alex White prata(a)kuei-jin.org Fingerprint = 58DC 9199 CE73 74E8 B2C1 442E ACF5 92E0 E068 C46C gpg key location: http://www.kuei-jin.org/GPG-KEY-PRATA ~From the withered tree, a flower blooms --Zen Proverb -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) Comment: Using GnuPG with Red Hat - http://enigmail.mozdev.org iD8DBQFCgMlwrPWS4OBoxGwRArUIAJ9Qr6ST5/9acQD6XwQoaZJ7lI8ztwCeK4pU ukvh3E6R1POrNkAkZRejjFg= =J5+I -----END PGP SIGNATURE-----

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