Interesting. I think this may not be a bad idea. Thanks for the info. On Monday, March 3, 2014, Jean-Tiare LE BIGOT <[email protected]> wrote:
> To get consistent RBD live snapshots, you may want to first freeze the > guest filesystem (ext4, btrfs, xfs) with a tool like [fsfreeze]. It will > basically flush the FS state to disk and blocking any future write access > while maintaining Read accesses. > > [fsfreeze] http://manpages.courier-mta.org/htmlman8/fsfreeze.8.html > > On 02/28/2014 11:27 PM, Gregory Farnum wrote: > >> RBD itself will behave fine with whenever you take the snapshot. The >> thing to worry about is that it's a snapshot at the block device >> layer, not the filesystem layer, so if you don't quiesce IO and sync >> to disk the filesystem might not be entirely happy with you for the >> same reasons that it won't be happy if you pull the power plug on it. >> -Greg >> Software Engineer #42 @ http://inktank.com | http://ceph.com >> >> >> On Fri, Feb 28, 2014 at 2:12 PM, Greg Poirier <[email protected]> >> wrote: >> >>> According to the documentation at >>> https://ceph.com/docs/master/rbd/rbd-snapshot/ -- snapshots require >>> that all >>> I/O to a block device be stopped prior to making the snapshot. Is there >>> any >>> plan to allow for online snapshotting so that we could do incremental >>> snapshots of running VMs on a regular basis. >>> >>> _______________________________________________ >>> ceph-users mailing list >>> [email protected] >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >>> _______________________________________________ >> ceph-users mailing list >> [email protected] >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> > -- > Jean-Tiare, shared-hosting team > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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