RE: Aacraid - terrible performance on RHES3 pedge 2450

Vary_io may be the reason for this.

The driver needs to have .vary_io set to 1.

There are no kernel clues to its existence (that I know of), but the
driver has an SCSI_HAS_VARY_IO to enable. Our build system will produce
correct binaries, but the DKMS tool does not differentiate.

There is a need to ship a different driver source in the DKMS package
for RHEL3 as a result (Add a #define SCSI_HAS_VARY_IO in the aacraid.h
file).

Sincerely -- Mark Salyzyn

-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx
[mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Matt Domsch
Sent: Monday, October 25, 2004 8:22 AM
To: Zoe May
Cc: linux-raid@xxxxxxxxxxxxxxx
Subject: Re: Aacraid - terrible performance on RHES3 pedge 2450

On Mon, Oct 25, 2004 at 11:31:07AM +0100, Zoe May wrote:
> 
> I am experiencing disk performance issues (very slow) with hardware
and
> software combo listed below.
> 
> Poweredge 2450 
> Perc 3/si controller.
> RH linux ES3 (2.4.21-4.Elsmp)

up2date your system to kernel-smp-2.4.21-20.EL and see how much that
helps.

You're not the only person who has seen slow disk performance with the
-4.EL kernel.

Thanks,
Matt

-- 
Matt Domsch
Sr. Software Engineer, Lead Engineer
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
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