Hitachi MP-96RD625-01 manual Remote Copy Connections

Each LDKC controls 255 CUs, however the number of CUs that can be used for USP V program products is up to 255. Therefore, the maximum number of volumes that can be used for USP V program products is 130,560 (65,280 volumes for an LDKC).

Remote Copy Connections

The remote copy connections are the physical paths used by the primary storage systems to communicate with the secondary storage systems. Remote copy connections enable communication between the primary and secondary storage systems. The primary storage systems and secondary storage systems are connected via fibre-channel interface cables. You must establish paths from the primary to the secondary storage system, and also from the secondary to the primary storage system. Up to eight paths can be established in both of these directions.

When fibre-channel interface (optical multimode shortwave) connections are used, two switches are required for distances greater than 0.5 km (1,640 feet), and distances up to 1.5 km (4,920 feet, 0.93 miles) are supported. If the distance between the primary and secondary sites is greater than 1.5 km, the optical single mode long wave interface connections are required. When fibre-channel interface (single-mode long wave) connections are used, two switches are required for distances greater than 10 km (6.2 miles), and distances up to 30 km (18.6 miles) are supported.

See section Setting up Remote Copy Connections for further information on installing and configuring the FC remote copy connections.

The URz remote copy configuration between primary storage system and secondary storage system has the following requirements:

URz supports 1-to-1 remote copy connection in one journal group pair. In one journal group pair, one primary storage system can be connected to only one secondary storage system. This configuration ensures the backup data consistency of two or more volumes (e.g., large databases) within the same storage system.

Note: Hitachi strongly recommends that you establish at least two independent remote copy connections from the primary storage system to the secondary storage system and vice versa to provide hardware redundancy for this critical communications path.

Chapter 2 About Universal Replicator Operations 2-9

Hitachi Universal Replicator for IBM /OS User’s Guide