Hitachi HUS VM, User And Reference Manual

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Creating a pair in cases where the device names in two device groups
in a copy group configured of simplex volumes and paired volumes
are different.
In the following example, a pair for device name A to A can be
created. For the device name B and C, although it does not change
the paired status, but an error occurs because they have different
device names.
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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 using CCI. However, some of the
replication functions are not available in CCI. For more detailed information,
see the user manual for the replication function: Hitachi TrueCopy® for
Mainframe User Guide , Hitachi Universal Replicator for Mainframe User Guide ,
or Hitachi ShadowImage® for Mainframe User Guide .
Using "dummy" LUs for mainframe LDEVs
Pseudo-LUs called "dummy" LUs are used to access mainframe LDEVs in CCI.
The dummy LUs are unconditionally defined for all mainframe device
emulation types. Since the dummy LUs are used only by CCI, other user
interfaces such as Storage Navigator 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.
CCI functions
3-49
Command Control Interface User and Reference Guide