On 5/23/14 16:20 , C?dric 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. -- *Craig Lewis* Senior Systems Engineer Office +1.714.602.1309 Email clewis at centraldesktop.com <mailto:clewis at centraldesktop.com> *Central Desktop. Work together in ways you never thought possible.* Connect with us Website <http://www.centraldesktop.com/> | Twitter <http://www.twitter.com/centraldesktop> | Facebook <http://www.facebook.com/CentralDesktop> | LinkedIn <http://www.linkedin.com/groups?gid=147417> | Blog <http://cdblog.centraldesktop.com/> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140527/962b5337/attachment.htm>
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