Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

Multi-path software (also referred to as the failover driver) is the software resident on the host server that provides management of the redundant data path between the host server and the storage array. For the multi-path software to correctly manage a redundant path, the configuration must have redundant iSCSI connections and cabling.

The multi-path software identifies the existence of multiple paths to a virtual disk and establishes a preferred path to that disk. If any component in the preferred path fails, the multi-path software automatically reroutes I/O requests to the alternate path so that the storage array continues to operate without interruption.