Hitachi VSP F1500 User And Reference Manual page 126

If a consistency group attribute is valid and no consistency group ID is
specified, automatically assign a consistency group ID (1 copy group=1
consistency group). If the automatic consistency group assignment is
specified and the other pairs in a copy group already have consistency group
IDs, assign the same consistency group ID.
If there is no target LDEV to be a pair in the copy group, the process is
terminated by detecting an error.
• Use cases
As an example of pair operation, the following shows use cases that can
be created a pair by specifying a copy group.
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Creating a pair in cases where the device names and the numbers of
LDEVs in two device groups in a copy group configured of simplex
volumes are the same.
In the following example, pairs are created with LDEVs that have the
same device name, A to A and B to B.
Creating a pair in cases where the device names and the numbers of
LDEVs in two device groups in a copy group configured of simplex
volumes and paired volumes are the same.
In the following example, a pair is created with LDEVs for the device
name A. And no operation is performed for the volumes of device
name B that are already formed into copy pairs.
Creating a pair in cases where different device names exist in two
device groups in a copy group configured of simplex volumes.
In the following example, a pair for device name A can be created, but
not for device name B and C because they have different names.
CCI functions
Command Control Interface User and Reference Guide