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IBM System Storage DS8000 Copy Services for IBM System z by Mark Wells, Alexander Warmuth, Luiz Moreira, Flavio Gondim De Morais, Peter Klee, Michael Frankenberg, Charles Burger, Thorsten Altmannsberger, Bertrand Dufrasne, Peter Cronauer

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z/OS Basic HyperSwap
Basic HyperSwap is a z/OS high availability feature available with the DS8000 storage system. It provides the capability to switch host I/O operations transparently, without application outage, between Metro Mirror primary and secondary volumes. The switch can be either planned (for maintenance) or unplanned (as a result of a primary storage system failure, for example).
This chapter describes the z/OS Basic HyperSwap functionality. It provides a short overview and describes some of the sequences of HyperSwap operations.

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