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SubjectRe: No SCSI Ultra 160 with Adaptec Controller
On Wed, 24 Jan 2001, Tom Sightler wrote:

> I temporarily disabled that code and the
> increase in IO's per second is measurable, though not earth shattering, but
> I was afraid to leave it that way because fast corrupted data is worth much
> less that only slightly slower good data.

I don't believe the problem is data corruption, but that there could be
some CRC data residual from an I/O which causes the driver to issue a
SCSI bus reset. As bus resets really kill performance, Doug thought it
better to slow the drive to 80 rather than run at 160 and have occasional
bus resets.

Matt Domsch
Dell Linux Systems Group
Linux OS Development

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