Creating the delta resync pair

For creating a UR delta resync pair, all of the following conditions must be met:

• A 3DC multi-target configuration is set up.

• Only one storage system at the primary and the secondary site.

• TC S-VOL's status is PAIR and is used for the UR delta resync P-VOL.

• UR S-VOL's status is PAIR and is used for the UR delta resync S-VOL.

• Between the mirror IDs 1 and 3, UR delta resync pair uses another mirror ID than the one used by the regular UR S-VOL.

• The consistency group is not used in UR pair.

• The conditions when using the TC volumes as UR P-VOL or S-VOL as described in Volume types that can be shared with Universal Replicator are met.

• SOM 506 is set to ON at each site. SOM 506 is set to ON by default.

• When creating multiple UR delta resync pairs, all the above conditions must be met and all the UR delta resync pairs in the journal must use the same mirror ID.

Procedure

1. Install and set TrueCopy and Universal Replicator.

2. Create TC pair at the primary system.

3. After the TC pair status become PAIR, create UR pair at the primary system.

4. Create the UR delta resync pair.

Specify TC pair S-VOL to UR delta resync pair P-VOL, UR pair S-VOL to UR delta resync pair S-VOL.

When creating UR delta resync pair, select different mirror ID (Mirror ID 1 to 3) than the mirror ID which was used in step 3.