HP XP7 Continuous Access Journal for Mainframe Systems User Guide (TK911-96001)

Splitting, restoring, releasing pairs in an EXCTG
With Business Continuity Manager, you can split, restore, and release all pairs in an EXCTG
collectively.
Pair-split operation
When you perform a pair-split operation in an EXCTG, you have the choice of specifying Flush or
Purge for Suspend Mode.
• With Flush, the pairs in the EXCTG are split with the consistency of the data update sequence
maintained.
• With Purge, consistency of the data update sequence is not maintained within the EXCTG,
but within each journal. With Purge, the pair-split operation is completed faster than with
Flush.
NOTE: When you split all pairs in a specific journal in an EXCTG, you cannot use the REVERSE
option of the Business Continuity Manager YKSUSPND command.
Operations for a specific journal
When you split, restore, or release all pairs in a specific journal in an EXCTG, the supervisor DKC
executes arbitration processing on the other journals.
For example, in Figure 14 (page 55), if you collectively split all pairs that belong to journal 1, the
supervisor DKC executes arbitration processing on journals 2 and 3, and therefore consistency of
data update sequence is maintained only within the primary systems 2 and 3 and the secondary
systems 2 and 3. If you restore pairs in journal 1, the supervisor DKC executes arbitration processing
on journals 1 and 3.
Figure 14 Multiple systems in EXCTGs
Splitting, restoring, releasing pairs in an EXCTG 55