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Date:      Mon, 19 Apr 2010 20:31:52 +0100
From:      Pete French <petefrench@ticketswitch.com>
To:        freebsd-stable@freebsd.org
Subject:   Problems with gmirror locking up on recent 8.0-STABLE/i386
Message-ID:  <E1O3whE-000GSB-UC@dilbert.ticketswitch.com>

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I have a machine used as a firewall which boots from a pair of
drives mirrored using gmirror. This has been in situ for a long
time, and was upgraded to 8.0 a while ago.  Just before the weekend
I upgraded the kernel to the latest STABLE to get the new em code.
After doing this I observed that at seemingly random points the disc
system would 'lockup' by which I mean that all networking continued
fine, but if you tried to do anything which would read or write the
disc then that would pause forever. Only fixed by reboot, and on
reboot the array was degraded, and always resynced the same drive.

"dying drive" I thought to myself - seemed a resonable conclusion.

Except today I took another machine (completelt different hardware BTW)
and build a new system with different drives, but the same gmirrored
configuration - and an hour after I had installed it, it locked up
in exactly the same way. Just after I upgraded it to match the version
of the kernel running onthe original one in fact.

So now I am wondering if there is some unfortunate problem which has
crept into gmirror in the last few weeks. Has anyone else seen anything
like this ?

-pete.



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