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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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intall problems
by rado 11 May '05

11 May '05

I have just migrated to CentOS 4 from fc3. 3 machines involved k. 2 machines w/raid 1 arrays. Installing these were the problems. 1st machine: just a reg install hda for all the sys and a big drive: hdc for all my backups. This install worked fine. the other 2 machines, w/raid 1 drives...grrrrrrrrrr first of these 2: tried to do a reg install...of course, I had to use disk druid to map out the drives etc then just my reg (everything) install. all seemed to go fine but then when it rebooted...omg!!! 1st thing I saw was a fedora screen then like little things here and there kept referring to fedora...I ended up doing the following install choosing hda drive only...did minimal install (worked fine) then install choosing hdc drive only did minimal install (worked fine) then did my reg disk druid mapping raid 1 arrays and then this install finally worked fine. 2nd machine of these 2: Followed the same procedure as the above and when it rebooted, it hung on (I think it said grub 2) :sigh: I then did the same above procedure as above and it finally took! wow...was not a nice stable experience tho! I keep thinking that it would be a good time if the install systems would do a complete zeroing of the hds, if need be, before formatting the file systems...I just used zeroing as an example but it did kinda freak me out seeing fedora stuff on a brand new CentOS 4 install! thx John Rose -- ...you ever notice the look on your neighbors face when you start talking about linux?

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Kernel panic on Dell 1850
by Jason Dixon 11 May '05

11 May '05

I'm attempting to upgrade to kernel-smp-2.4.21-27.0.4.EL (x86_64) on a Dell 1850. The new kernel is panicing on reboot. When comparing against the current working kernel, I just noticed that we're currently running the "UP" kernel: [root@polaris root]# uname -srvp Linux 2.4.21-27.0.2.EL #1 SMP Wed Jan 19 11:49:43 CST 2005 x86_64 First question... why is the kernel version reporting as SMP when this is the UP kernel package? I thought it might have something to do with HT, but no, it's seeing both processors: [root@polaris root]# cat /proc/cpuinfo | grep proc processor : 0 processor : 1 processor : 2 processor : 3 Second question... has anyone else experienced problems with kernel-smp-2.4.21-27.0.4.EL on x86_64? I installed the newer kernel and it paniced on reboot. I'm offsite without console, so I'll be going in tomorrow to take a closer look. Just FYI, here is the information on each kernel we're working with: [root@polaris root]# rpm -qi kernel Name : kernel Relocations: (not relocatable) Version : 2.4.21 Vendor: CentOS Release : 27.0.2.EL Build Date: Wed 19 Jan 2005 12:56:58 PM EST Install Date: Fri 08 Apr 2005 05:44:16 AM EDT Build Host: head Group : System Environment/Kernel Source RPM: kernel-2.4.21-27.0.2.EL.src.rpm Size : 33381631 License: GPLv2 Signature : DSA/SHA1, Thu 20 Jan 2005 10:52:57 AM EST, Key ID 7049e44d025e513b Summary : The Linux kernel (the core of the Linux operating system) Description : The kernel package contains the Linux kernel (vmlinuz), the core of your CentOS operating system. The kernel handles the basic functions of the operating system: memory allocation, process allocation, device input and output, etc. [root@polaris root]# rpm -qi kernel-smp Name : kernel-smp Relocations: (not relocatable) Version : 2.4.21 Vendor: CentOS-3 Release : 27.0.4.EL Build Date: Fri 22 Apr 2005 06:47:22 PM EDT Install Date: Wed 11 May 2005 10:16:23 AM EDT Build Host: tru64 Group : System Environment/Kernel Source RPM: kernel-2.4.21-27.0.4.EL.src.rpm Size : 26669758 License: GPLv2 Signature : DSA/SHA1, Fri 22 Apr 2005 07:12:58 PM EDT, Key ID 7049e44d025e513b Packager : Pasi Pirhonen <upi(a)iki.fi> - http://iki.fi/upi/ Summary : The Linux kernel compiled for SMP machines. Description : This package includes a SMP version of the Linux kernel. It is required only on machines with two or more CPUs. Install the kernel-smp package if your machine uses two or more CPUs. Thanks in advance, -- Jason Dixon DixonGroup Consulting http://www.dixongroup.net

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