Target Port Group Support

Target Port Group Support (TPGS) provides failover for a storage subsystem. Failover is an automatic operation that switches the data path for a logical drive from the preferred controller to the alternate controller in the case of a hardware failure.

TPGS is part of the ANSI T10 SPC-3 specification. It is implemented in the controller firmware. TPGS is similar to other multi-pathing options, such as Auto Logical Drive Transfer (ADT) and Redundant Dual Active Controller (RDAC), which were developed prior to defining a multi-pathing standard. The advantage of TPGS is that it is based on the current standard, which allows interoperability with multi-pathing solutions from other vendors. Interoperability with other multi-pathing solutions simplifies administration of the host.

Each host type uses only one of the multi-path methods: RDAC, ADT, or TPGS. The availability of TPGS depends on whether the combination of the operating system and the failover driver present on the host supports it.

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