Notes on rollback
Note the following.
Warning:
Rollback deletes all files that were created after the creation-date of the snapshot that you restore. Rollback returns a file system or volume to a given point in time. Any data changes or snapshots that were made after that time are lost.
Also, if there are multiple logical volumes on a single disk or volume group and if you perform a Point in Time Rollback of a specific logical volume, the entire disk or volume group is restored to the point in time.
Rollback can be done only from the backups that were enabled for Instant Recovery and made with one of the following methods: VxFS_Checkpoint, VxVM, FlashSnap, NAS_Snapshot, or the disk array methods.
Rollback can be done from the backups that were enabled for Instant Recovery and made with and made with VSO snapshot method.
If the backup was made with the EMC_TimeFinder_Clone method and the clone is not fully created, a rollback cannot succeed.
To verify that the clone is complete before you do a rollback:
See Verifying that the clone is complete before doing a point in time rollback.
For the backups that were made with the VxFS_Checkpoint method, rollback requires the VxFS File System 4.0 or later and Disk Layout 6. For NAS_Snapshot, the file system requirements depend on the NAS vendor.
Rollback deletes any VxFS_Checkpoint snapshots or NAS_Snapshot snapshots (and their catalog information) that were created after the creation-date of the snapshot that you restore.
Rollback deletes any snapshots (and their catalog information) that were created after the creation-date of the snapshot that you restore.
If the primary file system is mounted and the snapshot resides on a disk array, the rollback attempts to unmount the file system. Any I/O on the primary device is forcibly stopped if the unmount succeeds. To be safe, make sure that no I/O occurs on the primary device before a rollback.
If the attempt to unmount the primary file system fails, the rollback does not succeed. You should halt I/O on the device and retry the rollback. For example, if a terminal session has accessed the file system through the cd command, change to a directory outside the file system and retry the rollback.
Rollback is available only when you restore the file system or volume to the original location on the client.
When a file system rollback starts, NetBackup verifies that the primary file system has no files that were created after the snapshot was made. Otherwise, the rollback aborts.
Rollback from OST_FIM type snapshot can be done from copy one only.
Rollback from VSO_FIM type snapshot can be done from copy one only.
For the rollback from OST_FIM type snapshot, refer to the NetBackup Replication Director Solutions Guide.