pair creation. As configuration information, a copy group name, a device
group name (primary and secondary), and an MU# are maintained in the
storage system.
The notes when operating copy groups are shown below.
When creating a copy group
• In case of creating a copy group by executing a command, a copy group
cannot be created through direct specification of multiple LDEVs. Create a
copy group by specifying a device group.
• In one device group associated as a copy group, the same device name
cannot be defined.
• Copy groups with the same name cannot be defined within the same
storage system.
• One device group cannot be defined to multiple copy groups.
• The maximum number of copy groups per storage system is 16,384.
• At the time of consistency group creation (pair creation) and consistency
group deletion (pair deletion), the collaboration with the group operations
(device group creation/deletion, copy group creation/deletion) is not
performed.
When deleting a copy group
• If a copy group is deleted, the association of two device groups is deleted.
However, the actual pair status, the consistency group ID and others are
not changed (not affected). Even if the pair status in the copy group is
not single and the copy group is deleted, the copy group deletion
processing is performed.
• If an LDEV is deleted from a device group associated as a copy group, the
relevant LDEVs are deleted from all the associated copy groups.
• A copy group defines the relationship of device groups. Therefore, it is not
possible to specify an LDEV and remove it from the copy group.
• Regardless of the pair status (copy status), it is possible to exclude LDEVs
from device groups associated as a copy group.
The contents of the following operations that can be executed for a copy
group are expressed hereafter with its use cases.
1. Copy group creation
2. LDEV addition to copy group
3. LDEV deletion from copy group
4. Copy group deletion
5. Pair operation by specifying a copy group
Note: The following symbols are used in the use cases described hereafter.
3-44
CCI functions
Command Control Interface User and Reference Guide
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