HP XP Racks - Manual (Page 22)

When you restore a path with higher priority than the currently-used path, I/O is switched to the
restored path.
Multi path mode
For Multi path mode, all paths are used for I/O to the external volume. This distributes workload
in a round-robin process.
The following figure illustrates how failure is handled with redundant paths in Multi mode.
22 Requirements and planning