Bug in aac?

[Scott Long]

Cstdenis wrote:
> I am running 6.1-p11 with a Adaptec SAS RAID 4800SAS running a mirror of
> 2 15k rpm SCSI drives.
> 
> Under heavy IO load (Its a database server) I get the following
> accompanied by serious system lag:
> 

The system recovers after this?  Strange.  What the messages mean is
that I/O has been sent to the controller, and the controller has not
responded in a reasonable period of time.  Usually this is a sign of
the controller has died and will not recover.  So if it is recovering
then either there is a firmware bug that is making the controller pause
for a long period of time, or there is some sort of yet-undiscovered
driver bug.  Of course you should make sure that you're running the
latest firmware from Adaptec.  These cards are new and SAS in general
is relatively new, so bugs are not unlikely.  One question, though, how
are you running SCSI drives on a SAS controller?  Are you going through
some sort of converter?

Scott