UR pair operations

Parent Topic

• Universal Replicator

  Universal Replicator provides asynchronous, real-time replication of data from one storage system to another over any distance to satisfy the most demanding business continuity and disaster recovery requirements. While conventional replication solutions push updates from the primary storage system to a remote location, Universal Replicator at the remote site pulls changes from journal volumes maintained by the storage system at the primary site. This approach offloads replication overhead from the primary storage system and dramatically reduces the impact of replication on the business application. Transmitted record sets include a sequence number, enabling the replication engine to verify receipt of all records at the remote site and to sequence writes in the correct order for storage replication.

Child Topics

• Pair operations
• Creating a UR pair

  When you create a pair, the pair relationship between the volumes is established, and the initial copy operation is performed. The P-VOL remains available to the host for I/O operations during the initial copy operation.

• Checking the pair status
• Splitting a UR pair

  When you split a pair, write-data is no longer sent to the S-VOL and the pair is no longer synchronized. Splitting a pair or mirror gives you a point-in-time copy of the P-VOL.

• Splitting a mirror

  A mirror normally has multiple pairs with the same master and restore journals groups. When you split a mirror, you split all the pairs in the mirror. As with a normal pair split, data copying is suspended between primary and secondary journals.

• Creating point-in-time copies

  Universal Replicator allows you to make Point-in-Time (PiT) copies of volumes in the same journal. Point-in-Time describes a copy of data made when you made it.

• Resynchronizing a UR pair

  Resynchronizing a pair updates the S-VOL with differential data that accumulated since the pair was split. After the pair is resynchronized, the S-VOL is again updated from the journals.

• Resynchronizing a mirror

  When you resynchronize a mirror, all the pairs with the mirror ID are resynchronized and update data copy to the S-VOL is resumed.

• Deleting a UR pair

  When you delete a pair, the UR relationship between the P-VOL and S-VOL is released. Only the relationship is affected, the data volumes and their data remain.

• Deleting a mirror

  When you delete a mirror, data copying between master and restore journals ends. After deleting the mirror, pairs in the mirror are also deleted.

• Managing pairs in a GAD 3DC delta resync environment