July 05, 2015

Storage Array Type Plug-In (SATP)

SATP

Storage Array Type Plug-Ins (SATPs) run in conjunction with the VMware NMP and are responsible for array-specific operations.

ESXi offers a Storage Array Type Plug-in (SATP) for every type of array that VMware supports in the VMware Hardware Compatibility List (HCL). It also provides default SATPs that support non-specific active-active and ALUA storage arrays, and the local SATP for direct-attached devices.

Each SATP accommodates special characteristics of a certain class of storage arrays and can perform the array-specific operations required to detect path state and to activate an inactive path. As a result, the NMP module itself can work with multiple storage arrays without having to be aware of the storage device specifics.

The SATP monitors the health of each physical path and can respond to error messages from the storage array to handle path failover. There are third-party SATPs that the storage vendor can provide to take advantage of unique storage properties.

After the NMP determines which SATP to use for a specific storage device and associates the SATP with the physical paths for that storage device, the SATP implements the tasks that include the following:
  • Monitors the health of each physical path.
  • Reports changes in the state of each physical path.
  • Activates an inactive path
  • Performs array-specific actions necessary for storage fail-over, e.g. activates passive paths.
Managing SATPs

The esxcli storage nmp satp list command lists the SATPs that are currently available to the NMP system and displays information about those SATPs:

Reference:

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