[2514] in linux-scsi channel archive
Re: Adaptec 2940 support
daemon@ATHENA.MIT.EDU (yuri mironoff)
Mon Sep 22 14:51:16 1997
Date: Mon, 22 Sep 1997 14:20:36 -0400 (EDT)
From: yuri mironoff <yuri@buster.rgti.com>
To: Jeff Noxon <jeff@planetfall.com>
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <19970922111350.12451@xyzzy>
On Mon, 22 Sep 1997, Jeff Noxon wrote:
> It will work. On my 3940W with a raid 0 of two IBM wide 2.2gb 7200rpm
> disks, I get about 9MB/sec. If I read one disk, I get about 7MB/sec.
> This is with dd and a 64k blocksize. I haven't tried these disks with
> a BusLogic or DPT controller yet, so I can't comment on how good or bad
> the raw throughput is.
I'm not sure this has anything to do with the Adaptec board. I have
the same problem with the NCR 825, Advansys 940U and Adaptec
2940UW boards. None of them will scale. I have 2 disks: one dd's at 7
mb/sec and the other at 4 mb/sec when run sequentially. In parallel they
cumulatively manage about 8.5 mb/sec. BONNIE shows the same sort
of behavior. Copying a file from one disk to the other is only marginally
faster than copying on the same disk. I'm at a loss to explain this.
Can someone with other controllers try these same tests to see if
they have the same problem?
Y.
P.S. I'm running 2.0.30-9 SMP.
