Workflow for 3DC cascade configuration with three UR sites

You must create two UR pairs for the two mirrors, create a delta resync pair, and allocate remote command devices to finish creating a 3DC cascade configuration with three UR sites.

When you create a 3DC cascade 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 intermediate site. Specify the restore journal volume and S-VOL for the master journal volume and P-VOL used in the first mirror. Specify from 0 to 3 for the mirror ID. Assign a mirror ID not used in step 1.
4. Wait until the UR pair status is changed to PAIR. When you set up the delta resync configuration, use the steps from 5 to 7.
5. Create a UR delta resync pair with the primary and secondary site volumes by doing the following:
   • Specify P-VOL for P-VOL in the primary site of the first mirror.
   • Specify S-VOL for S-VOL in the secondary site of the second mirror.
   • Specify from 0 to 3 for a mirror ID. Assign a mirror ID not used in the step 1 and 3.
6. Allocate remote command devices for each two mirror IDs in the primary site.

   Allocate remote command devices also for the UR delta resync pair's mirror ID.

7. Allocate remote command devices for the mirror ID in the intermediate site.
8. Allocate remote command devices for the mirror ID in the secondary site.

Parent Topic

• Configuration workflow

  The configuration workflow lists the tasks necessary to prepare your storage systems for Universal Replicator.