RE: RAID5 unusably unstable through 2.6.14

[Martin Drab <drab@kepler.fjfi.cvut.cz>]

On Fri, 3 Feb 2006, Salyzyn, Mark wrote:

> Martin Drab [mailto:drab@kepler.fjfi.cvut.cz] sez:
> > no access was possible at all to that block device entirely.
> 
> Then 'we' are missing an offline message (from SCSI/block or from a
> check of the controller's array status).

Besides, when the disk goes offline, which is what happened to me before 
due to the bad setting of the AAC_MAX_32BIT_SGBCOUNT constant in 
aacraid.h, kernel adequately responses with messages saying something like 
this:

[  278.705813] scsi0 (0:0): rejecting I/O to offline device
[  278.708685] Buffer I/O error on device sda2, logical block 1
[  278.711589] lost page write due to I/O error on sda2

As you may see in my first report of the event when I've witnessed the 
real situation of the array going offline, see the whole report here:

	http://lkml.org/lkml/2005/7/5/194

However this time, it was different. I am a 100% positive that no such 
messages appeared whatsoever. Only these:

      sd 0:0:0:0: SCSI error: return code = 0x8000002
      sda: Current: sense key: Hardware Error
          Additional sense: Internal target failure
      Info fld=0x0
      end_request: I/O error, dev sda, sector <some sector number>

Nothing else.

Martin
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