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Date:      Tue, 22 Sep 2009 08:59:05 -0500
From:      "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org>
To:        Kurt Touet <ktouet@gmail.com>
Cc:        freebsd-fs <freebsd-fs@freebsd.org>
Subject:   Re: ZFS - Unable to offline drive in raidz1 based pool
Message-ID:  <4AB8D829.4060301@jrv.org>
In-Reply-To: <2a5e326f0909211044k349d6bc1lb9bd9094e7216e41@mail.gmail.com>
References:  <2a5e326f0909201500w1513aeb5ra644f1c748e22f34@mail.gmail.com>	<4AB757E4.5060501@goflexitllc.com>	<2a5e326f0909211021o431ef53bh3077589efb0bed6c@mail.gmail.com> <2a5e326f0909211044k349d6bc1lb9bd9094e7216e41@mail.gmail.com>

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Kurt Touet wrote:
> I wonder then, with the storage array reporting itself as healthy, how
> did it know that one drive had desynced data, and why wouldn't that
> have shown up as an error like DEGRADED?

The uberblock on each ZFS disk contains a txtag, in effect a revision
number.  When a pool is imported and one drive's txtag is older than the
others then that drive needs resilvering.



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