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Date:      Wed, 09 Jul 2008 15:56:31 +0200
From:      Kris Kennaway <kris@FreeBSD.org>
To:        aslam_mohamed@wordbank.com
Cc:        Dmitry Morozovsky <marck@rinet.ru>, current@FreeBSD.org
Subject:   Re: Thinking of using ZFS/FBSD for a backup system
Message-ID:  <4874C38F.9040706@FreeBSD.org>
In-Reply-To: <4874BEFF.20202@wordbank.com>
References:  <bd9320b30807072315x105cf058tf9f952f0f5bb2a6a@mail.gmail.com> <20080708100701.57031cda@twoflower.in.publishing.hu> <bd9320b30807080131j5e0e02a4y3231d7bfa1738517@mail.gmail.com> <4873C4FA.2020004@FreeBSD.org> <20080709062533.J58331@woozle.rinet.ru> <48749087.4070802@FreeBSD.org> <20080709145010.Q58331@woozle.rinet.ru> <48749EA7.40702@FreeBSD.org> <20080709152739.Q58331@woozle.rinet.ru> <4874A453.7060406@FreeBSD.org> <4874A981.7080106@wordbank.com> <4874B58B.7000108@FreeBSD.org> <4874BEFF.20202@wordbank.com>

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aslam_mohamed@wordbank.com wrote:
> Thanks for your reply. I did get some weired messages like ' vdev 
> failure'  just two days before the ZFS pool disappeared, but I don't 
> know whether this is from ZFS or another GEOM issue. I shut the machine 
> down and restarted everything back and got it to do the sync again. 
> Later I noticed zpool status was showing some big numbers like (83, 90 
> ...) on checksum column. I did the zpool clear and it cleared the 
> numbers. Then I think couple days later the sync process stopped in the 
> middle. When I investigated it, I found that zpool status is not there. 
> I think the firewire/FreeBSD could be a potential contributor to this 
> problem. Now I am trying to recover the backup data (if there is any in 
> external disks!!) by connecting the external disks to SUN Solaris and 
> getting the SUN/ZFS to see the pool!!!.. I cant think of any other ways 
> to recover the backup!!!..

It probably should have set off alarms for you when you first started 
seeing checksum failures.  That indicates a serious problem!  At this 
point, it sounds like your data might be highly corrupted, and 
unfortunately, perhaps too corrupted to recover.

Kris



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