On Monday, March 3, 2014, Jean-Tiare LE BIGOT <jean-tiare.le-bigot@xxxxxxx> 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 <greg.poirier@xxxxxxxxxx> 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.
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Jean-Tiare, shared-hosting team
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