If a Secondary volume becomes corrupted due to I/O errors, the volume can be restored from backup. When a vxrlink restore is initiated, a request is sent to the Primary to begin updates from a previously recorded Storage Checkpoint. A restore is not guaranteed to succeed though because Storage Checkpoints can become stale which means that the Primary has stopped maintaining the updates necessary for the restore. If this occurs, the Secondary RVG must be re-initialized using a Primary Storage Checkpoint or an autosync attach instead of being restored from backup.