HP StorageWorks XP Remote Web Console Software - Manual (Page 13)

HPAV for z/OS user guide for the XP128/XP1024/XP12000/XP10000 13
advance to the base devices 1, 2 and 3 work as alias devices that are assigned to all base devices in the
same LU.
For example, If I/O requests have converged on the base device 1 when a host computer accesses the
base device 1 by using Compatible Hyper PAV, I/O requests will be issued to the alias devices
automatically. In this case, all alias devices that were assigned to the base devices 1, 2 and 3 in this LU
work as the alias devices for the base device 1. If a host computer accesses similarly to the base devise 2
or 3, I/O requests will be also issued to all alias devices in this LU automatically.
The base device 4 is also able to use all alias devices in this LU as its alias though an alias device is not
assigned to the base device 4.