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Showing posts from June 28, 2015

Pluggable Storage Architecture (PSA)

PSA - (Storage API - Multipathing) With a SAN, to improve availability, the administrator can create multiple, redundant paths between hosts and storage targets or LUNs. However, multiple, redundant paths can introduce confusion if not properly managed. Multipathing software was created to minimize the confusion. Multipathing software takes control of all I/O requests; it chooses the best path for data transmission and manages path failover if an active path becomes unavailable. The multipathing software in ESXi is known collectively as the Pluggable Storage Arctitecture (PSA). The PSA is used to manage storage multipathing in ESXi. It is an open, modular framework that coordinates the simultaneous operation of other multipathing plug-ins (MPPs) created by VMware and/or third-party software developers. Pluggable Storage Architecture (PSA) vSphere Pluggable Storage Architecture (PSA) Framework is a special VMkernel layer in vSphere that manages storage multi-pathing. It