3DC cascade configuration with three UR sites

With Universal Replicator, you can set up one intermediate site and one secondary site for one primary site. It is advisable that you create a UR pair that connects the primary and secondary sites so that the remote copying system that is created with the host operation site and backup site is configured immediately in the event of a failure or disaster at the intermediate site.

The following illustration shows the 3DC cascade configuration with three UR sites:

• UR primary site (copies data with a mirror whose ID is an arbitrary number (M in the illustration) to the intermediate site).

• UR intermediate site (copies data with a mirror whose ID is an arbitrary number (M in the illustration) from the primary site and copies data with a mirror whose ID is an arbitrary number (N in the illustration) to the secondary site).

• UR secondary site (copies data with a mirror whose ID is an arbitrary number (N in the illustration) from the intermediate site).