New ZFSv28 patchset for 8-STABLE

Pawel Jakub Dawidek pjd at
Mon Jan 10 09:09:30 UTC 2011

On Sun, Jan 09, 2011 at 12:49:27PM +0100, Attila Nagy wrote:
> No, it's not related. One of the disks in the RAIDZ2 pool went bad:
> (da4:arcmsr0:0:4:0): READ(6). CDB: 8 0 2 10 10 0
> (da4:arcmsr0:0:4:0): CAM status: SCSI Status Error
> (da4:arcmsr0:0:4:0): SCSI status: Check Condition
> (da4:arcmsr0:0:4:0): SCSI sense: MEDIUM ERROR asc:11,0 (Unrecovered read 
> error)
> and it seems it froze the whole zpool. Removing the disk by hand solved 
> the problem.
> I've seen this previously on other machines with ciss.
> I wonder why ZFS didn't throw it out of the pool.

Such hangs happen when I/O never returns. ZFS doesn't timeout I/O
requests on its own, this is driver's responsibility. It is still
strange that the driver didn't pass I/O error up to ZFS or it might as
well be ZFS bug, but I don't think so.

Pawel Jakub Dawidek             
pjd at                 
FreeBSD committer                         Am I Evil? Yes, I Am!
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