On Tue, Nov 12, 2019 at 6:39 AM Toby Darling <[email protected]> wrote: > > Hi Folks > > I'm writing a backup/sync process for our ceph cluster. The process > takes a snapshot of the system that's being backed up and rsync's from > that to another ceph cluster > > I was hoping to use the snapshot xattrs to verify a successful backup by > comparing ceph.dir.rbytes and ceph.dir.rentries between the snapshot and > backup target. > > However, while files added to the source directory after the snapshot is > taken don't appear in the snapshot, ceph.dir.rbytes and ceph.dir.rctime > are updated in the xattrs of both.
I don't remember for sure, but I think you're falling victim to rstat propagation being lazy here, and metadata in snapshots being somewhat delayed. Can you try doing a sync before you take the snapshot and see if that changes the behavior? -Greg > > $ fallocate -l 1K test1 > > $ getfattr -n ceph.dir.rbytes . > # file: . > ceph.dir.rbytes="1024" > > $ mkdir .snap/testsnap > > $ fallocate -l 2K test2 > > $ getfattr -n ceph.dir.rbytes . .snap/testsnap > # file: . > ceph.dir.rbytes="3072" > > # file: .snap/testsnap > ceph.dir.rbytes="3072" > > $ getfattr -n ceph.dir.rctime . .snap/testsnap > # file: . > ceph.dir.rctime="1573558448.09736131125" > > # file: .snap/testsnap > ceph.dir.rctime="1573558448.09736131125" > > $ tree -a --si . .snap > . > |-- [1.0k] test1 > `-- [2.0k] test2 > .snap > `-- [3.1k] testsnap > `-- [1.0k] test1 > > 1 directory, 3 files > > Have I misunderstood? Is this expected behaviour? > > Cheers > Toby > -- > Toby Darling, Scientific Computing (2N249) > MRC Laboratory of Molecular Biology > Francis Crick Avenue > Cambridge Biomedical Campus > Cambridge CB2 0QH > Phone 01223 267070 > _______________________________________________ > ceph-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > _______________________________________________ ceph-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
