pairs that have the same copy type. When an operation is performed on a CG group container,
it is performed on all of the pairs included in the container.
CAUTION: Because Business Continuity Manager actually sends instructions to the storage system
for each of the C/T groups included in a copy group container, consistency of each included
consistency group on the primary site and on the secondary site is preserved. However, consistency
between consistency groups in the copy group container is not preserved, except for extended
consistency groups. Extended consistency groups are described in section “Extended Consistency
Groups” (page 26).
Defining a copy group container is explained in “Defining a copy group container” (page 485).
“CG Container Overview” (page 26) gives an overview of copy group containers. In “CG Container
Overview” (page 26), when an operation is performed on the CG container (Copy group ID:
CG.UR), the operation is performed on the CG container (copy group ID CG.TCA), the operation
is performed in batch for the C/T groups with the C/T group IDs 71 and 72.
Figure 5 CG Container Overview
Extended Consistency Groups
In a 4x4 or 4x4x4 configuration, consistency can be preserved among journal groups spread
across among multiple storage systems. A copy group container that can preserve consistency
between multiple journal groups is called an Extended Consistency Group (EXCTG).
26 Overview of HP P9000 for Business Continuity Manager Software
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