MPIO allows a server to use multiple paths for I/O if they are available.
MPIO software offers redundancy at the path level. MPIO typically operates in a round-robin manner by sending packets first down one path and then the other. If a path becomes unavailable, MPIO software continues to send packets down the functioning path.
NOTE: MPIO is operating-system specific, and it loads as a driver on the server or it is part of the server operating system.