On Fri, Sep 21, 2012 at 6:31 AM, andy thomas <a...@time-domain.co.uk> wrote: > I have a ZFS filseystem and create weekly snapshots over a period of 5 weeks > called week01, week02, week03, week04 and week05 respectively. Ny question > is: how do the snapshots relate to each other - does week03 contain the > changes made since week02 or does it contain all the changes made since the > first snapshot, week01, and therefore includes those in week02?
Every snapshot is based on the previous one and store only what is needed to capture the differences. > To rollback to week03, it's necesaary to delete snapshots week04 and week05 > first but what if week01 and week02 have also been deleted - will the > rollback still work or is it ncessary to keep earlier snapshots? No, it's not necessary. You can rollback to any snapshot. I almost never use rollback though, in normal use. If I've accidentally deleted or overwritten something, I just rsync it over from the corresponding /.zfs/snapshots directory. Only if what I want to restore is huge, rollback might be a better option. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
