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Date:      Sat, 17 Dec 2005 07:54:46 +1100
From:      Peter Jeremy <PeterJeremy@optushome.com.au>
To:        delphij@delphij.net
Cc:        freebsd-stable <freebsd-stable@freebsd.org>
Subject:   Re: indefinite wait buffer: Does this indicate hardware issue?
Message-ID:  <20051216205446.GS77268@cirb503493.alcatel.com.au>
In-Reply-To: <a78074950512161206l370bdd7fg8b1e8fd1f6ab0a43@mail.gmail.com>
References:  <a78074950512160849w70335610xd2cb0c3b61ed92a2@mail.gmail.com> <20051216193942.GA92029@xor.obsecurity.org> <a78074950512161206l370bdd7fg8b1e8fd1f6ab0a43@mail.gmail.com>

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On Sat, 2005-Dec-17 04:06:36 +0800, Xin LI wrote:
>No, it's sometimes other, and is quite infrequent.  On the other hand,
>neither SMART nor error has reported some incident, so I was stuck
>when looking on hardware issues, as the message does not indicate
>which disk(s) may have problem...

A hardware error should have been reported as such.  But if you
suspect a disk problem, try dd'ing the swap partition (or the whole
disk) to /dev/null.  If you can read the whole partition, you can
probably write to it.  (Or you could dd /dev/zero to the partitions
whilst swap is not attached - eg in single user after boot).  If you
suspect retries are a problem, monitor the I/O rate with iostat or
systat and see if it suddenly drops.

-- 
Peter Jeremy



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