On Tue, 2008-06-03 at 19:38 -0400, Brian J. Murrell wrote: > On Tue, 2008-06-03 at 15:43 -0500, Chris Cox wrote: > > > > I would think this would be VERY hard to do since both the "origin" and > > "snapshot" change (file deletes, etc). > > I don't think it's as difficult as you are thinking it is. You are > thinking of synchronizing filesystems, at the filesystem level, but > merging a snapshot back up into the origin does not deal with files or > even filesystems. It deals with block devices and blocks, and is really > nothing more than a coordinated: > > for each COW_block in snapshot; do > for other_snapshot of origin; do > copy origin[COW_block] to other_snapshot[COW_block] > copy snapshot[COW_block] to origin[COW_block] > done > done > > > Do you have a set of rules you > > use for the merge? > > There is no filesystem level merge. There are no rules needed. Ok... I'm still a bit confused (sorry)... I'm going to assume a last out wins scenario with regards to meta data conflicts ... yes.. I know, I'm having a tough time separating out the filesystem element from the block device :) Thanks for the answer... it does make sense (just makes my brain hurt). _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
