Adaptec U160 tuning

[jack at coats.org (Jack Coats)]

when you reboot, check the bios.  This card is 'settable' by device (SCSI
target) as to the expected transfer rate.  I ran into this when putting an
IBM 3583 on, and the transfer rate for the LTO defaulted to 160, and it
should
have been 80.  Changing the rate made things seem to work right where they
did not before.

-----Original Message-----
From: discuss-admin at blu.org [mailto:discuss-admin at blu.org]On Behalf Of
Dan Barrett
Sent: Monday, November 17, 2003 10:14 AM
To: discuss at blu.org
Subject: Adaptec U160 tuning


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Folks,
I'm running a SCSI rig with one of the Adaptec U160 cards -- uses the
aic7xxx
driver, I think (I'm at work; the box is at home).  Each device is running
at
half its possible speed, though: my 80MB/sec drives all show up in boot logs
as being initialized at 40MB/sec; even my CD-R is initializing at a transfer
rate of 10MB/sec.  I've got the correct cabling and everything works great,
I'd just like to wring every ounce of speed out of these drives.

Best,
d.
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