Date: Mon, 11 Aug 1997 01:00:41 -0500 (CDT) From: Edward Welbon <welbon@bga.com> To: Doug Ledford <dledford@dialnet.net> Cc: "Daniel M. Eischen" <deischen@iworks.InterWorks.org>, aic7xxx@FreeBSD.ORG Subject: Re: aic7xxx / AHA2940 worries... anyone? Message-ID: <Pine.LNX.3.96.970811002603.272H-200000@tarantula.arachnid.com> In-Reply-To: <199708110509.AAA11039@dledford.dialnet.net>
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On Mon, 11 Aug 1997, Doug Ledford wrote:
One thing I did not make clear was that the crashes occur more frequently
when the file sizes are larger and also occur more frequently when the CPU
speed increases. At a 2GB file size, a single pass of Bonnie often wont
complete. This evening I have been running Bonnie in the background on
2GB files with Symbios 875 based controllers so I don't think it is my
drives excepting that the 875 will not queue deeper than 12 commands..
> driver firmware, it may just be that under the kind of load 9 drives can
> create on a controller, we are losing commands and getting hosed.
I have three controllers with three drives per controller. The mdadd is
set up such that in sequential accesses the each next card is accessed. I
did this thining that it would distribute the load accross the controllers
a little better. There are cases were it is faster. The mdadd is:
/sbin/mdadd /dev/md0 /dev/sdb2 /dev/sde2 /dev/sdh2 \
/dev/sdc2 /dev/sdf2 /dev/sdi2 \
/dev/sdd2 /dev/sdg2 /dev/sdj2
/sbin/mdrun -p0 -c64k /dev/md0
disks sdb, sdc and sdd are on scsi2.
disks sde, sdf and sdg are on scsi3.
disks sdh, sdi and sdj are on scsi4.
So in a sequential access the code hops from controller to controller. It
makes a measureable difference when I read from cylinders near the outer
edge. I don't have a direct comparison to a case with the interleaving at
my fingertips, but check out the block read and block write rates in the
attachment. Not too shabby IMHO.
Ed Welbon; welbon@bga.com;
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