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Date: Sun, 7 Sep 2014 19:56:41 +0400
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Andriy Gapon <avg@FreeBSD.org>
Subject: Re: svn commit: r260713 -
 head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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On Thu, Jan 16, 2014 at 01:24:10PM +0000, Andriy Gapon wrote:

> Author: avg
> Date: Thu Jan 16 13:24:10 2014
> New Revision: 260713
> URL: http://svnweb.freebsd.org/changeset/base/260713
> 
> Log:
>   fix a bug in ZFS mirror code for handling multiple DVAa
>   
>   The bug was introduced in r256956 "Improve ZFS N-way mirror read
>   performance".
>   The code in vdev_mirror_dva_select erroneously considers already
>   tried DVAs for the next attempt.  Thus, it is possible that a failing DVA
>   would be retried forever.
>   As a secondary effect, if the attempts fail with checksum error, then
>   checksum error reports are accumulated until the original request
>   ultimately fails or succeeds.  But because retrying is going on indefinitely
>   the cheksum reports accumulation will effectively be a memory leak.
>   
>   Reviewed by:	gibbs
>   MFC after:	13 days
>   Sponsored by:	HybridCluster

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