HP XP RAID Manager Software - Manual (Page 82)

◦ Creating a pair in cases where the numbers of LDEVs in two device groups in a copy
group configured of simplex volumes are different.
In the following example, pairs are created for the device name A to A and B to B.
Pair operations with volumes for mainframe
For the P9500 storage system, you can create a pair with LDEVs for mainframe by using RAID
Manager. Because there are some unusable functions, see the HP P9000 Continuous Access
Synchronous for Mainframe Systems User Guide, HP P9000 Continuous Access Journal for
Mainframe Systems User Guide, and HP P9000 Business Copy Mainframe Systems User Guide
for more detailed information.
Using dummy LU
To use LDEVs for mainframe, you must define pseudo LUs (dummy LUs). The dummy LUs are
unconditionally defined when the emulation types of LDEVs are for mainframe systems. Since the
dummy LUs are used by only RAID Manager, other user interfaces, for example Remote Web
Console and host servers, do not display the dummy LUs. You cannot define host modes for dummy
LUs. Two dummy LUs are assigned to an LDEV for mainframe. The port IDs of mainframe PCBs are
assigned as the port IDs for dummy LUs.
The port number of dummy LUs are derived from the following formula.
Port#:Installed Port#(*1) (LDEV# / 0x4000)x32
Installed Port#(*1) (LDEV# / 0x4000)x32+1
*1: The minimum port number of installed ports for mainframe.
TID: (LDEV# & 03xFCO)/64
LU-M: (LDEV# &0x3F)
The mainframe volume pair can be executed just like the open volume when specifying LDEV# of
the mainframe at the HORCM_LDEV in a configuration definition file.
If you specify existing mainframe pairs, verify their MU # by using the raidscan command.
82 RAID Manager functions on P9500