According to Feico Dillema:
>
> Another note, the machine
>hosts *two* adaptec SCSI controllers. Can that cause trouble like this?
>

Hmmm I don't think so.

How many devices have you got on the bus?  are all the disks of the
same vintage (fast vs slow scsi maybe)?  what happens if you turn off
sync negotiation?  I had a disk that worked fine until you _really_
thrashed it and then it would just stop working - turning off sync
negotiation made things much better.

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Brett Lymn, Computer Systems Administrator, BAE SYSTEMS
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