HP XP7 Storage - Manual (Page 88)

◦ 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 mainframe volumes
You can create a pair with mainframe LDEVs by using RAID Manager. However, some of the
replication functions are not available in RAID Manager. For more detailed information, see the
user manual for the replication function: HP XP7 Continuous Access Synchronous for Mainframe
Systems User Guide, HP XP7 Continuous Access Journal for Mainframe Systems User Guide, or
HP XP7 Business Copy for Mainframe Systems User Guide.
Using "dummy" LUs for mainframe LDEVs
Pseudo-LUs called "dummy" LUs are used to access mainframe LDEVs in RAID Manager. The dummy
LUs are unconditionally defined for all mainframe device emulation types. Since the dummy LUs
are used only by RAID Manager, other user interfaces such as Remote Web Console and host
servers do not display the dummy LUs. Two dummy LUs are assigned to each mainframe LDEV.
The port IDs of the mainframe PCBs are assigned as the port IDs for the dummy LUs. Host modes
cannot be defined for dummy LUs.
To determine the port number for dummy LUs, use the following formula:
Port#:Installed Port#(*1) (LDEV# / 0x4000)x32
Installed Port#(*1) (LDEV# / 0x4000)x32+1
*1: The lowest port number of the installed mainframe ports.
TID: (LDEV# & 03xFCO)/64
LU-M: (LDEV# &0x3F)
To perform pair operations on mainframe volumes just like on open-system volumes, include the
mainframe LDEV# in the HORCM_LDEV section of the configuration definition file. If you have
mainframe pairs that already exist, you can verify their MU # using the raidscan command.
Pair status and access permission for mainframe LDEVs
The pair status of mainframe LDEVs is displayed in the same way as for open-system LDEVs.
However, access permissions to mainframe P-VOLs and S-VOLs are different from those of open
volumes. The following tables show the pair status and access permissions for mainframe LDEVs.
88 RAID Manager functions on the P9500 and XP7 Storage