Workflow for 3DC multi-target configuration with three UR sites

When you create a 3DC multi-target configuration with three UR sites, you must perform the following procedure after step 4 in Configuration workflow .

1. Create a UR pair for the first mirror in the primary site. Specify from 0 to 3 for the mirror ID when you create a UR pair.

2. Wait until the UR pair status has changed to PAIR.

3. Create a UR pair for the second mirror in the primary site. Specify the same master journal volume and P-VOL used for the first mirror. Specify a value from 0 to 3 for the mirror ID. Assign a mirror ID not used in step 1.

4. Wait until the UR pair status has changed to PAIR. To create a 3DC multi-target configuration using the delta resync, perform the following procedure from steps 5 to 7.

5. Create a UR delta resync pair with the S-VOLs in the two secondary sites by doing the following:

• Specify the S-VOL of the first mirror in the secondary site as the P-VOL.

• Specify the S-VOL of the second mirror in the secondary site as the S-VOL.

• Specify from 0 to 3 for the mirror ID. Assign a mirror ID not used in steps 1 and 3.

 Specify the P-VOL and S-VOL for the delta resync pair for convenience. When you actually perform a delta resync operation, the failover destination site is used as the P-VOL.

6. Allocate remote command devices for each two mirror IDs in the primary site.

7. Allocate remote command devices for a mirror ID of the UR delta resync pair in each secondary site.

• When you delete a UR pair of the first mirror created in step 1 or delete a UR pair of the second mirror created in the step 3, the delta resync mirror's UR pair created in step 5 will also be deleted.

• Perform the pair operations by using CCI for the 3DC multi-target configuration with three UR sites.