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sync() in 2.6.38.5

To: xfs-oss <xfs@xxxxxxxxxxx>
Subject: sync() in 2.6.38.5
From: Paul Anderson <pha@xxxxxxxxx>
Date: Tue, 29 Nov 2011 14:17:26 -0500
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Hi all,

2.6.38.5 (x64 intel, in todays case a 40TiByte SAN volume) appears to
have a bug whereby not all active metadata will be flushed even on a
quiescent machine (one that has nonetheless in the past been under
very high load).

We have tried several variations of clean shutdowns, combined with for
example the "echo 3 >/proc/sys/vm/drop_caches" trick to no avail - we
still get lost files (well, 0 length files).

We have several big servers scheduled to go down shortly, and I was
wondering if there are other ideas besides just coping all recent data
to another server.

Thanks,

Paul

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