Remote Copy SLD failover operation to a synchronous target

A failover changes the secondary Remote Copy groups on the synchronous target to primary. When failing over to a synchronous target, the failover operation responds differently based on the auto synchronize policy setting.

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, SystemB is the primary-rev system and SystemC is the periodic secondary target. Replication occurs between SystemB and SystemC.

When the synchronous target system becomes the failover system, the synchronous target system assumes the role of the primary system. The host has read/write access to the volumes in the Remote Copy groups on the synchronous system.

Figure 2: Failing over to the synchronous target systemDiagram: Failing over to synchronous target
An Auto synchronize policy is not enabled failover operation:

  • Changes the SLD Remote Copy group Target role from Secondary, Secondary to Primary-Rev, Secondary (SystemB and SystemC).

  • Changes the DR state to Failover.

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

An Auto synchronize policy enabled failover operation:

  • Changes the SLD Remote Copy group Source system to the synchronous target system (SystemB) and makes the role Primary. SystemA is now a secondary system.

  • Keeps the DR state as Normal.

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