On Thu, 5 Feb 2015, Lindsay Mathieson wrote:
> On 5 February 2015 at 07:22, Sage Weil <sage@xxxxxxxxxxxx> wrote:
> > Is the snapshoting performed by ceph or by the fs? Can we
> switch to
> > xfs and have the same capabilities: instant snapshot + instant
> boot
> > from snapshot?
>
> The feature set and capabilities are identical. The difference
> is that on
> btrfs we are letting btrfs do the efficient copy-on-write
> cloning when we
> touch a snapshotted object while with XFS we literally copy the
> object
> file (usually 4MB) on the first write.
>
> Are ceph snapshots really that much faster when using btrfs underneath? one
> of the problem we have with ceph is that snapshot take/restore is insanely
> slow, tens of minutes - but we are using xfs.
What API are you using? Creating RBD snaps should be very fast.
sage
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