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PowerMaxOS is the software operating environment for PowerMax arrays. It manages the storage and controls communications with the host systems. There are additional features for PowerMaxOS that provide specific capabilities such as remote replication. The software for a PowerMax is available in packages that consist of a core set of features and additional, optional features. For PowerMaxOS 5978 and earlier, there are two packages for open systems arrays and two for mainframe arrays. For PowerMaxOS 10 there is one package, plus an optional SRDF package.