Date: Tue, 26 Jan 2010 10:03:46 -0800 (PST) From: Paul Pathiakis <pathiaki2@yahoo.com> To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>, Xin LI <delphij@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS - scrub lead to corruption? Message-ID: <422431.76479.qm@web110504.mail.gq1.yahoo.com> In-Reply-To: <alpine.GSO.2.01.1001260959190.17824@freddy.simplesystems.org> References: <419976.64363.qm@web110515.mail.gq1.yahoo.com> <a78074951001252217k5ee1a4a2rdfa2fc6905e4894a@mail.gmail.com> <alpine.GSO.2.01.1001260959190.17824@freddy.simplesystems.org>
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From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Xin LI <delphij@gmail.com> Cc: Paul Pathiakis <pathiaki2@yahoo.com>; freebsd-fs@freebsd.org Sent: Tue, January 26, 2010 11:04:39 AM Subject: Re: ZFS - scrub lead to corruption? On Mon, 25 Jan 2010, Xin LI wrote: >> 16) scrub continues to over 75% (I wasn't watching for the exact #) and then *panic* level 12 > > Do you have console access to the server? Try setting up a crash dump > and see if you can obtain a backtrace? > > By the way, 'zpool status -x' may give some information that is useful. Since scrub automatically re-starts after system reboots, it should help to use 'zpool scrub -s pool' immediately after boot (assuming there is enough time to do a console login) to stop the existing scrub. This may defer the panic enough to figure out what is going wrong. I used to get system panics here (Solaris 10) during scrub, but it was eventually determined that a flaky fiber channel card was to blame. Two systems paniced here during 'zfs scrub' and both times it was due to problems with an adaptor card. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ Thank you, Bob. It worked fine. I'm up and working on the machine as I'm typing this. The zpool status <pool> says everything's fine. (??!!) That's a relief. However, why did the scrub cause it to crash? I'd like to ask this list a serious question: What can I do to check what is causing scrub to panic the machine? Is there any other consistency tool that I can run on ZFS to see if something is corrupted/wrong? As a forward action, I'm going to cvsup STABLE again and try rebuilding. I'm about to check to see if m4 is still there but I'm worried that the /usr/bin directory is where my trouble exists and I'll be crashing again. Please let me know. (Bob, BTW, I just checked into OpenSolaris bootable CD it's nice, you may want to check it out - FreeBSD is still a passion due to it's BSD storied history.) Thanks! Paul I'd like to ask this list
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