Re: IBM ESS (Shark) connectivity on a RedHat AS 2.1
From: F. Michael Orr (morr_at_utility.vccs.edu)
Date: 02/10/04
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Date: Tue, 10 Feb 2004 10:32:40 -0500
On Mon, 09 Feb 2004 18:15:49 -0800, Mike O'Reilly wrote:
> Ilya Usvyatsky wrote:
>> Hi folks,
>> I am trying to connect a Shark (IBM ESS) array to a Linux box that is
>> running RH AS 2.1 (errata 27). I am using 2 Qlogic 2300 HBA's. I've
>> configured array and zoned the switch so that 8 LUNs should be visible
>> to the host. Yet, the host
>> for some strange reason sees only one LUN - on both adaptors. I am
>> using the 'latest and greatest' Qlogic driver (not the one that comes
>> from RH). And I am able to see my other array (HPXP) on the very same
>> box with no problem.
>> Your help will be greatly appreciated.
>> Puzzled,
>> Ilya.
>
> Can you see all the LUNS in the BIOS. Go into the QLA2x00 BIOS,
> Fast!UTIL by hitting ctrl-Q when you see our BIOS banner. Run the Fibre
> Disk Utility to determine the ID(s) of the target, hit enter on the
> target to see its LUNS. It is important that you have LUN 0 present and
> that all the LUNS be contiguous (do not skip LUNS).
You also have to set up support for multiple LUNs per target; this is not
on by default. Add the following line to /etc/modules.conf:
options scsi_mod max_scsi_luns=128
Then, recreate the initrd image from which you boot via 'mkinitrd'. You
also _may_ have to add the line "max_scsi_luns=128" as a command line
parameter to the kernel; I have had situations where sometimes that was
required and other times it was not.
After you can see the LUNs, if you run SDD, then you _MUST_ use ext2;
ext3 will panic your kernel. Also, if you're like our shop and use a
"cookie-cutter" LUN size, then you can't use LVM on the LUNs; you have to
use Software RAID-0. An unfortunate side effect of the way the Linux
kernel allocates device descriptors is that a Linux system will only be
able to see 40 LUNs if it boots off of a SCSI device, even with the above
configuration. Other than all of the above caveats, you should be able to
access the Shark quite well; we have several production RHAS systems doing
just that.
Have you gotten a copy of SC26-7446? That is very specific about the
needed changes, kernel levels, etc, and can be downloaded from IBM's Shark
Web site (http://www.storage.ibm.com/hardsoft/products/ess/index.html?)
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