Rolling Back a ZFS Snapshot
You can to discard all changes made to a file system since a specific snapshot was created by using the zfs rollback
command. The file system reverts to its state at the time the snapshot was taken. By default, the command cannot roll back to a snapshot other than the most recent snapshot.
To roll back to an earlier snapshot, you must destroy all intermediate snapshots by specifying the -r
option.
If clones of any intermediate snapshots exist, use the -R
option to destroy the clones as well.
Note:
The file system that you want to roll back must be unmounted and remounted, if it is currently mounted. If the file system cannot be unmounted, the rollback fails. Use the-f
option to force the file system to be unmounted, if necessary.
In the following example, the system1/home/kaydo
file system
is rolled back to the tuesday
snapshot.
$ zfs rollback system1/home/kaydo@tuesday cannot rollback to 'system1/home/kaydo@tuesday': more recent snapshots exist use '-r' to force deletion of the following snapshots: system1/home/kaydo@wednesday system1/home/kaydo@thursday $ zfs rollback -r system1/home/kaydo@tuesday
In the following example, the wednesday
and thursday
snapshots are destroyed because the file system is rolled back to the earlier tuesday
snapshot.
$ zfs list -r -t snapshot -o name,creation system1/home/kaydo
NAME CREATION
system1/home/kaydo@tuesday Fri Aug 3 15:18 2012