Remote Copy SLD failover operation to a periodic target

A failover changes the secondary Remote Copy groups on the periodic target to primary. When the periodic target system becomes the failover system, the synchronous target system temporarily assumes the role of the primary system. Data is transferred from the synchronous system to the periodic system. Then, the periodic target system becomes the primary-rev system. The host has read/write access to the volumes in the Remote Copy groups on the periodic system.

In this example, before the failover, SystemA is the primary system, SystemB is the synchronous secondary target, and SystemC is the periodic secondary target. After the failover, SystemC is the primary system and SystemB is the synchronous secondary target. Replication occurs between SystemC and SystemB.

Figure 3: Failing over to the asynchronous periodic systemDiagram: Failing over to periodic system
  • Changes the SLD Remote Copy group Target role from Secondary, Secondary to Secondary, Primary-Rev (SystemB and SystemC).

  • Changes the DR state to Failover.

  • Provides the host read/write access to the source and periodic systems (SystemA and SystemC).