Planning connections to the ESS

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PowerHA® SystemMirror® Enterprise Edition for Metro Mirror communication with the ESS requires connections to each of the ESS subsystems through the ESSNet administrative network. This access lets PowerHA SystemMirror Enterprise Edition for Metro Mirror use the ESS Command Line Interface (CLI) to control the ESS subsystems during event processing.

Commands are sent to the ESS Copy Services Server software that runs on one of the ESS subsystems in the environment.

The PowerHA SystemMirror cluster nodes can either connect directly to the ESSNet or connect over a router or bridge. The interfaces that communicate with the ESSNet can be defined to PowerHA SystemMirror, but IP address takeover (IPAT) should not be used on those interfaces. If the interfaces are defined to PowerHA SystemMirror, ensure that the nodes can gain access to ESSNet at any time.

Note: The reliability of the connection between a node and the ESSNet directly affects the performance of PowerHA SystemMirror Enterprise Edition for Metro Mirror. A slow or unreliable network connection to ESSNet results in commands to initiate a fallover being processed slowly or unreliably.