perc6 managed raid, disks randomly going into "unknown" state

Joe Malicki jmalicki at
Mon Mar 2 21:20:57 CST 2009

It's happened for us with some disks timing out.

Disk firmware updates have helped similar issues in the past
(almost every disk vendor has experienced similar problems, with
 many different RAID cards - it's an endemic problem not specific
 to any RAID card or disk drive manufacturer).

-joe malicki

----- "Tim Robertson" <tim at> wrote:

> Hi everyone,
> We have a perc6-managed RAID array whose disks have recently begun
> entering  "unknown" states, seemingly at random, with no data loss.
> Have any of you experienced this before?  None of the drives have
> failures predicted, the hardware is quite new (all within the last
> year), and the unknown states are sporadic and random (i.e. different
> disks will go "unknown" at different times).  I have so far been able
> to re-set the states by restarting the server.
> Have any of you ever experienced this sort of thing?  Should we be
> anticipating a failure?
> Thanks in advance for your help,
> Tim
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