HP XP7 Storage - Manual (Page 81)

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.
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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.
LDEV grouping function 81