On Thu, 18 Apr 2013, Stefan Priebe - Profihost AG wrote: > Am 17.04.2013 um 23:14 schrieb Brian Behlendorf <[email protected]>: > > > On 04/17/2013 01:16 PM, Mark Nelson wrote: > >> I'll let Brian talk about the virtues of ZFS, > > > > I think the virtues of ZFS have been discussed at length in various other > > forums. But in short it brings some nice functionality to the table which > > may be useful to ceph and that's worth exploring. > Sure I know about the advantages of zfs. > > I just thought about how ceph can benefit. Right now I've no idea. The > osds should be single disks so zpool, zraid does not matter. Ceph does > it own scrubbing and check summing and instead of btrfs ceph does not > know how to use snapshots with zfs. That's why I'm asking.
The main things that come to mind: - zfs checksumming - ceph can eventually use zfs snapshots similarly to how it uses btrfs snapshots to create stable checkpoints as journal reference points, allowing parallel (instead of writeahead) journaling - can use raidz beneath a single ceph-osd for better reliability (e.g., 2x * raidz instead of 3x replication) ZFS doesn't have a clone function that we can use to enable efficient cephfs/rbd/rados snaps, but maybe this will motivate someone to implement one. :) sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
