Data restored in an external restore

If you lose a disk, or the whole system, you can externally restore data only if it was externally backed up. You must use the same third-party utility for both the external backup and restore. To externally restore the storage spaces, copy the backed-up data to disk. Use the onbar -r -e command to mark the storage spaces as physically restored, replay the logical logs, and bring the storage spaces back online. If you do not specify an external restore command, the database server thinks that these storage spaces are still down.

You can perform these types of external restores:
  • Warm external restore

    Mark noncritical storage spaces as physically restored, then perform a logical restore of these storage spaces.

  • Cold external restore

    Mark storage spaces as physically restored, then perform a logical restore of all storage spaces. Optionally, you can do a point-in-time cold external restore.

Restriction: When you perform a cold external restore, ON-Bar does not first attempt to salvage logical-log files from the database server because the external backup has already copied over the logical-log data.

To salvage logical logs, perform onbar -l -s before you copy the external backup and perform the external restore (onbar -r -e).