HP StorageWorks XP Remote Web Console Software - Manual (Page 7)

About XP Compatible Hyper PAV Feature
XP Compatible Hyper PAV was evolved from static Compatible PAV and dynamic Compatible
PAV.
If you use XP Compatible Hyper PAV, alias devices that are assigned to any base device are
shared with all base devices in the same LCU. Thereby, the number of alias devices assigned to
each base device by XP Compatible Hyper PAV does not need to change, as it does if you use
Dynamic Compatible PAV. This feature allows more devices to be assigned to a base device than
possible when using Compatible PAV because you can reduce the quantity of devices that are
assigned to an alias device.
You can specify the type of PAV (Compatible PAV or XP Compatible Hyper PAV) to use for each
host computer. Therefore, an alias device may accept both I/O requests that are issued when you
use the Compatible PAV and XP Compatible Hyper PAV.
When you use z/VM, it is assumed that you are using z/OS as a guest OS on z/VM.
Figure 2 Flow of I/O Requests Using XP Compatible Hyper PAV
Figure 2 (page 7) illustrates that alias devices A, B and C are assigned to base device 1. Alias
devices D, E and F are assigned to base device 2 and alias devices G, H and I are assigned to
base device 3 within an LCU. When using XP Compatible Hyper PAV, all alias devices assigned
in advance to base devices 1, 2 or 3 work as alias devices for all base devices in the same LCU.
For example, if I/O requests come from a host computer to base device 1 using XP Compatible
Hyper PAV, they are automatically issued to the alias devices in the same LCU. For XP Compatible
Hyper PAV, the rule is that all alias devices assigned to any base devices in this LCU are used as
About XP Compatible Hyper PAV Feature 7