On 5/23/14 16:20 , Cédric Lemarchand wrote:
Out of curiosity, what's the current beef with zfs? I know what
problems are cited for btrfs, but I haven't heard much about zfs lately.
The Linux implementation (ZoL) is actually stable for production, but is quiet
memory hungry because of a spl/slab fragmentation issue ...
But I would ask a question : even with a snapshot capable FS, is it sufficient
to achieve a consistent backup of a running leveldb ? Or did you plan to
stop/snap/start the mon ? (No knowledge at all about leveldb ...)
Cheers
A ZFS snapshot is atomic, but it doesn't tell the daemons to flush their
logs to disk. Reverting to a snapshot looks the same as if you turned
off the machine by yanking the power cord at the instant the snapshot
was taken.
It's not a nice thing to do to a daemon, but the monitors need to be
able to handle a dirty shutdown.
It would be better to stop the monitor, snapshot, and start the
monitor. It shouldn't cause any problems if you don't, and I wouldn't
bother.
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