Restore journal

Restore journal operations are performed when the secondary storage system writes journal data in the restore journal volume to the S-VOL.

• Journal data in the restore journal volume is copied to the S-VOL according to the write-sequence numbers to ensure data consistency.

• When a restore journal operation to the S-VOL is completed, the journal data in the restore journal volume is discarded, and the journal data in the master journal volume is also discarded.

The primary storage system discards journal data in the master journal volume when it receives the sequence number from the restore journal, which is attached to the read journal command from the secondary storage system.