FlashSnap service helps to create snapshots of Oracle database, which can be cloned and used for backup. When the primary Oracle database faces some kind of corruption, which renders the database non-functional, you can use volume snapshots to recover from such errors and return back to the point in time when the snapshots were created. This process of recovering a database from its volume snapshots created using FlashSnap service is referred to as Reverse Resynchronization or Reverse Resync.

You can use the Storage Foundation Database Flashsnap feature to reverse resynchronize an online or offline point-in-time image of a database in an Oracle environment.

Reverse resync means restoring snapshot mirror volumes to primary data volumes. You can use reverse resync in cases where the primary data volumes are logically corrupted, and you want to replace the contents from the snapshot volumes.

Reverse resync operation is split into three distinct operations. The three operations are as follows: