PSA is a special layer of the monitor (VMkernel) used to manage storage multipathing.
VMware PSA allows storage vendors, through a modular storage architecture aka PSA, to write plug-ins for their specific capabilities.
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The specific details of handling path failover for a given storage array, that is the claiming and unclaiming, are delegated to a Storage Array Type Plug-In (SATP).There are two types of NMP/MPP sub plug-ins, Storage Array Type Plug-Ins (SATPs), and Path Selection Plug-Ins (PSPs).SATPs and PSPs can be built-in and provided by VMware’s generic multipathing plug-in (NMP).Yes that means you could have multiple and different plug-ins installed.But so far only EMC came with MPP plug-in called Power Path/VE.