The four-site SRDF/SQAR configuration provides disaster restart capabilities at DC2, DC3 or DC4. Figure 7Figure 7 illustrates GDDR operation in a SRDF/SQAR environment. This topology features redundant SRDF/A connections for continuous DR protection out of region and provides the ability to resume a two site SRDF/S operation in another region without having to perform a full resynchronization between the arrays.

Figure 7.                  GDDR SRDF/SQAR

In this environment, GDDR can perform the following tasks:

• Manage planned site swaps
• Manage planned region swaps
• Continue remote SRDF/A replication following inter-site link failure
• Resume SRDF/S with AutoSwap protection in a remote region following unplanned site/region outage
• Manage recovery after unplanned site swaps
• Manage recovery after unplanned region swaps
• Perform standard operational tasks:

• IPL, system reset, activate, deactivate
• Trigger stop/start of business workloads

• Actively monitor for unplanned/failure events, including:

• Sites
• Systems
• ConGroup trip
• AutoSwap event
• Loss of SRDF/S
• Loss of SRDF/A
• Inter-site communication failure

• Provide Cyber Recovery from any site or from all sites