On Sun, Aug 21, 2016 at 3:17 AM, Vimal Kumar <vimal7370@xxxxxxxxx> wrote: > Hi, > > [ceph@ceph1 my-cluster]$ ceph -v > ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374) > [ceph@ceph1 my-cluster]$ rados -p mypool ls > hello.txt > [ceph@ceph1 my-cluster]$ rados -p mypool mksnap snap01 > created pool mypool snap snap01 > [ceph@ceph1 my-cluster]$ rados -p mypool lssnap > 5 snap01 2016.08.21 03:59:28 > 1 snaps > [ceph@ceph1 my-cluster]$ rados -p mypool listsnaps hello.txt > hello.txt: > cloneid snaps size overlap > head - 13 > > Is this normal? Why is snap01 not listed in the above output? It is also > having 'hello.txt', then why does snap01 not feature in the above list? I > assume 'head' refers to the pool itself? > > > [ceph@ceph1 my-cluster]$ rados -p mypool rm hello.txt > [ceph@ceph1 my-cluster]$ rados -p mypool ls > [ceph@ceph1 my-cluster]$ rados -p mypool listsnaps hello.txt > hello.txt: > cloneid snaps size overlap > 5 5 13 [] > > So, only after removing the object from pool does the snapshot id shows up. > > > [ceph@ceph1 my-cluster]$ rados -p mypool rollback hello.txt snap01 > rolled back pool mypool to snapshot snap01 > [ceph@ceph1 my-cluster]$ rados -p mypool ls > hello.txt > [ceph@ceph1 my-cluster]$ rados -p mypool listsnaps hello.txt > hello.txt: > cloneid snaps size overlap > 5 5 13 [] > head - 13 > > After roll back of the deleted object from snapshot to pool, both snapshot > id and 'head' are listed! Isn't this same as the first case? You're sort of mixing paradigms here. The object-level listsnaps focuses on identifying the specific snapshotted versions of an object that exist on disk (which works on self-managed snapshots as well as pool snapshots); the pool-level lssnap shows which pool-wide snapshots logically exist. When you create a pool snapshot, any subsequent writes to objects will create snapshotted versions of the objects, but simply creating a pool snapshot doesn't do anything to them directly. -Greg > > More over, on checking the 'man' page of rados, I realise that 'listsnaps' > and 'rollback' options are missing. Is there a better / recommended way to > deal with pool snapshots? Oh, they probably just didn't get documented. Patches welcome! _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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