> Firstly, if you're running logs you really need a pair of devices.
ZFS doesn't cope at all well if a log device > fails - you'll
potentially loose access to your entire pool.

Yes, we generally have it deployed that way.  But, we were in a pinch
and hoping for a jump in performance, even if temporarily.  I understand
about not being able to remove log devices and what not.

> And secondly, are you talking here about the entire pool going
unusable when this drive started experiencing 
> problems?  If so, that sounds like the issue I've been harping on
about for well over half a year now - ZFS 
> relying on driver timeouts, and pools freezing when any single device
has a problem.

Yes, the whole pool would stall.  I assumed it was because it was the
first device in the write path, but based on your thread that may not be
the case.
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