HP XP Racks - Manual (Page 27)

Table 1 Methods for preserving consistency for each copy type (continued)
Consistency preservation method Consistency group ID
specification method
Consistency group ID specified Copy type
copy group attributes are
defined.
For EXCTG, the EXCTG ID
(Forward/Reverse) is specified Yes 4x4
configurations
in the Copy Group Detail
Definition panel. For details
about EXCTG, see
“Extended
consistency groups” (page 30) .
Legend: Yes = Required, Optional = Can be selected.
The Business Continuity Manager ISPF panels use the abbreviation C/T group for consistency
group.
For the Business Copy Z, TrueCopy Asynchronous for Mainframe, or Continuous Access Journal
Z copy type, before a consistency group can be defined, a consistency group ID must be registered
with the storage systems. This is described in
“Setting up Storage Systems” (page 119) .
You can define a consistency group in Business Continuity Manager by using the registered
consistency group ID. The functions of the storage system where the consistency group ID was
registered can preserve the consistency of the consistency group. Defining a consistency group is
explained in section
“Defining the copy group ID and copy group attributes (Continuous Access
Journal Z)” (page 642) .
CAUTION: If you define a consistency group across multiple storage systems and create a copy
group by specifying the consistency group ID, consistency is not preserved, except in the following
instances:
•
For TrueCopy Asynchronous for Mainframe: In a copy group configuration of two to four
primary storage systems and a secondary storage system.
•
For Continuous Access Journal Z: In an extended consistency group (see “Extended consistency
groups” (page 30) ).
This is similar to preserving consistency for a copy group container (see “Copy group containers”
(page 29) ).
NOTE: Throughout this manual, the terms consistency group and consistency group ID are used
in full when they appear in the text.
When a field on a Business Continuity Manager ISPF panel uses the abbreviation for either of
these terms (C/T group or C/T group ID), any related text duplicates the ISPF terminology and
follows it with the full term in parentheses.
How to check whether consistency is preserved
For TrueCopy Asynchronous for Mainframe or Continuous Access Journal Z copy groups, you can
check whether consistency is being preserved by checking the copy pair statuses and the diagnosis
information.
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