- a special VMkernel layer
- VMP (NMP by default VMware NMP, a generic Multipathing Plugin)
- SATP + PSP
- Manage physical path claiming and unclaiming
- Register and de-register logical devices
- Associates physical path with logical devices
- Processes I/O requests to logical devices (optimal physical path for the requests - load balance; fail-over )
- abort or reset logical devices
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