Multipathing and PSA troubleshooting
PSA is a collection of storage APIs used by a vSphere host using a VMkernel layer. PSA has different components, and its open and modular framework design allows an independent storage design for third-party SAN developers to directly interact with the storage I/O path of vSphere hosts.
PSA manages different plugins that perform different I/O operations, for example, synchronizing the concurrent I/O access, path selection, and load balancing can be defined by multiple multipathing plugins (MPPs), which can be provided by a SAN provider. The two most famous third-party MPPs are as follows:
- Symantec Dynamic Multi-Pathing (http://goo.gl/dTH2PV)
- EMC PowerPath (http://goo.gl/SNJRXr)
The following screenshot presents ...
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