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Date:      Mon, 10 Jan 2011 10:02:05 +0100
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        Attila Nagy <bra@fsn.hu>
Cc:        freebsd-fs@FreeBSD.org, freebsd-stable@FreeBSD.org, Martin Matuska <mm@FreeBSD.org>
Subject:   Re: New ZFSv28 patchset for 8-STABLE
Message-ID:  <20110110090205.GB1744@garage.freebsd.pl>
In-Reply-To: <4D29A0C7.8050002@fsn.hu>
References:  <4D0A09AF.3040005@FreeBSD.org> <4D297943.1040507@fsn.hu> <4D29A0C7.8050002@fsn.hu>

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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=
=20
> error)
> and it seems it froze the whole zpool. Removing the disk by hand solved=
=20
> 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.

--=20
Pawel Jakub Dawidek                       http://www.wheelsystems.com
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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