Details
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Bug
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Resolution: Cannot Reproduce
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Minor
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None
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Lustre 2.7.0
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None
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Scientific Linux 6 (kernel 2.6.32-573.7.1), Infiniband
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3
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9223372036854775807
Description
Unfortunately I don't have a useful reproducer for this, and it may
not be considered a bug, but it at least seems worth recording for others'
benefit.
/proc – specifically /proc/fs/lustre/devices – is apparently updated
asynchronously after a umount on a client. That can cause confusion
with subsequent checks unless they introduce a delay or poll.
I found this using shine to unmount and shut down Lustre at reboot
time on clients <http://sourceforge.net/p/lustre-shine/tickets/194/>.
There was a race between the basic umount and /proc/fs/lustre/devices
being updated when it was checked subsequently. I assume it's
affected by other activity during shutdown since it didn't show up in
a simple umount/cat loop in an interactive session.