HP StorageWorks XP Remote Web Console Software - Manual (Page 15)

External Storage XP user guide 15
NOTE: As you restore the error path, use of the restored path automatically resumes.
Figure 5 Alternate path mode is Multi mode
NOTE: In Multi mode, active I/O load balancing occurs across external disk array ports and controllers.
The XP and EMC DMX are examples of external disk arrays that use Multi mode.
Alternate path mode is Single mode
Figure 6 shows an example of when the alternate path mode is Single mode. When an error occurs in the
path used for I/Os, the I/O execution path switches to the path with the second highest priority.