On Thu, Mar 21, 2019 at 1:50 PM Tom Barron <tbarron@xxxxxxxxxx> wrote: > > On 20/03/19 16:33 +0100, Dan van der Ster wrote: > >Hi all, > > > >We're currently upgrading our cephfs (managed by OpenStack Manila) > >clusters to Mimic, and want to start enabling snapshots of the file > >shares. > >There are different ways to approach this, and I hope someone can > >share their experiences with: > > > >1. Do you give users the 's' flag in their cap, so that they can > >create snapshots themselves? We're currently planning *not* to do this > >-- we'll create snapshots for the users. > >2. We want to create periodic snaps for all cephfs volumes. I can see > >pros/cons to creating the snapshots in /volumes/.snap or in > >/volumes/_nogroup/<uuid>/.snap. Any experience there? Or maybe even > >just an fs-wide snap in /.snap is the best approach ? > >3. I found this simple cephfs-snap script which should do the job: > >http://images.45drives.com/ceph/cephfs/cephfs-snap Does anyone have a > >different recommendation? > > > >Thanks! > > > >Dan > >_______________________________________________ > >ceph-users mailing list > >ceph-users@xxxxxxxxxxxxxx > >http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > Dan, > > Manila of course provides users with self-service file share snapshot > capability with quota control of the snapshots. I'm sure you are > aware of this but just wanted to get it on record in this thread. > > Snapshots are not enabled by default for cephfs native or cephfs with > nfs in Manila because cephfs snapshots were experimental when the > cephfs driver was added and we maintain backwards compatability in > the Manila configuration. To enable, one sets: > > cephfs_enable_snapshots = True > > in the configuration stanza for cephfsnative or cephfsnfs back end. > > Also, the ``share_type`` referenced when creating shares (either > explicitly or the default one) needs to have the snapshot_support > capability enabled -- e.g. the cloud admin would (one time) issue a > command like the following: > > $ manila type-key <default-share-type> set snapshot_support=True > > With this approach either the user or the administrator can create > snapshots of file shares. > > Dan, I expect you have your reasons for choosing to control snapshots > via a script that calls cephfs-snap directly rather than using Manila > -- and of course that's fine -- but if you'd share them it will help > us Manila developers consider whether there are use cases that we are > not currently addressing that we should consider. > Hi Tom, Thanks for the detailed response. The majority of our users are coming from ZFS/NFS Filers, where they've gotten used to zfs-auto-snapshots, which we create for them periodically with some retention. So accidental deletions or overwrites are never a problem because they can quickly access yesterday's files. So our initial idea was to replicate this with CephFS/Manila. I hadn't thought of using the Manila managed snapshots for these auto-snaps -- it is indeed another option. Have you already considered Manila-managed auto-snapshots? Otherwise, I wonder if CephFS would work well with both the fs-wide auto-snaps *and* user-managed Manila snapshots. Has anyone tried such a thing? Thanks! dan > Thanks, > > -- Tom Barron > > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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