[4549] in linux-scsi channel archive
Re: AHA2790UW has speed-limit problems ?
daemon@ATHENA.MIT.EDU (Matti Aarnio)
Fri Aug 14 17:45:47 1998
In-Reply-To: <35D48BFF.6FAA1851@dialnet.net> from Doug Ledford at "Aug 14, 98 02:11:59 pm"
To: dledford@dialnet.net (Doug Ledford)
Date: Sat, 15 Aug 1998 00:17:13 +0300 (EEST)
Cc: matti.aarnio@sonera.fi, linux-scsi@vger.rutgers.edu, aic7xxx@FreeBSD.ORG
From: Matti Aarnio <matti.aarnio@sonera.fi>
Doug Ledford <dledford@dialnet.net> replies:
> Matti Aarnio wrote:
> > Hello,
> > Some days ago I sent a plea for fix to <linux-scsi@vger.rutgers.edu>
> > list. As it turns out, my problem seem to relate on the chassis internal
> > ultra-wide cable, and to the devices attached to it.
....
> > Four Ultra-Wide (SingleEnded) disks on high quality cable inside
....
> > Now my RAID0 write throughput has dropped from 12.odd MB/sec to 7.odd
> > MB/sec speed.
>
> I take it these drives aren't speed demons on their own? FWIW, I see 25.odd
> MB/sec sustained writes on a 4 drive RAID0 array here.
Oh they are reasonable, the RAID0 PAIR runs at 12+ MB/sec, but the
system has also two stand-alone disks.
( root: 2G, /home: 4G, /usr/src: 9+9 GB RAID0 pair )
> --
> Doug Ledford <dledford@dialnet.net>
/Matti Aarnio <matti.aarnio@sonera.fi>
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