On Fri, Mar 12, 2004 at 05:21:35PM -0600, Don Lee wrote:
> [...]
> Cable issues are also a candidate, but should also be independent of activity
> on the "other" drive, so I'm doubting that this is my problem.

There can be crossover issues.

> 
> There are two cables from different
> manufacturers.  I can load either disk up with activity, and it will
> run fine.  While the one is pounding away, if I "touch" the other one,
> I get the hiccups.  The internal drive can be busy or idle, and it makes
> no difference.  "touch" in this context is something like a "du -s dir" or
> something with a non-trivial number of disk accesses.  The quick ls or
> df does not trigger hiccups.
> 
> IMHO, behavior suggests a software issue.

I have a Promise Ultra133 in my PC, with a drive on each channel.
No problems.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--