On Fri, May 18, 2007 at 09:00:48PM +0200, Edgar Fuß wrote:
> Seems I'm running into every possible SCSI problem today.
> 
> I noticed that sysstat vm would give me 100% busy on sd5
> while only a few percent on the other RAID members.
> 
> Now what is this:
> 
> sd5(ahd1:0:3:0): unable to allocate scsipi_xfer

It just means the kernel didn't have enough free memory to send a request
to the drive. In this case the request stays in the driver's queue and will
be retried later (most likely when one of the currently pending requests
completes). It not a real problem, it just can have a small performance
hit.

-- 
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
     NetBSD: 26 ans d'experience feront toujours la difference
--