AFAIK, if you want to restore a snapshot version of a file or directory, you need to use "cp" or such commands, to copy the snapshot version into the present. This is not done in-place, meaning, the "cp" or whatever tool must read the old version of objects and write new copies of the objects. You may avoid the new disk space consumption if you have dedup enabled, but you will not avoid the performance hit of requiring the complete read & write of all the bytes of all the objects. Performance is nothing like a simple re-link of the snapshot restored object, and the newly restored objects are not guaranteed identical to the old version - because "cp" or whatever could be changing permissions and timestamps and stuff, according to the behavior of "cp" or whatever tool is being used.
So the suggestion, or question is: Is it possible or planned to implement a rollback command, that works as fast as a link or re-link operation, implemented at a file or directory level, instead of the entire filesystem? _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
