HP XP Continuous Access Software - Manual (Page 85)

Continuous Access XP user guide for the XP1024/XP128 85
For example, suppose the maximum initial copy activity setting is four, and you add six Continuous
Access XP pairs at one time (for LUNs 00 through 05) with the initial copy priority set as follows:
Difference Management: Measurement method Continuous Access XP uses to manage differential data for
the pair: Auto, Cylinder, or Track. The default is Auto. When you select Auto, either Cylinder or Track is
selected depending on basic size of the logical unit (LU).
Asynchronous parameters
C/T Group: Consistency group for new pairs (Async only). All Continuous Access XP Asynchronous pairs
must be assigned to a consistency group.
Error level: Error level for Continuous Access XP Async pairs.
• Group: When the specified pair is suspended, all Continuous Access XP Async pairs in the same
group are suspended, even if the failure affects only that pair and not the entire group.
Select Group for all Continuous Access XP Async volumes essential to disaster recovery.
• LU: If the failure affects only the specified pair, only that pair is suspended. A failure that affects an
entire group always results in suspension of all pairs in the group and all other affected Continuous
Access XP pairs.
Suspended Continuous Access XP Async S-VOLs with LU should not be used for disaster recovery.
Splitting Continuous Access XP pairs (Pairsplit-r)
Use the Pairsplit-r command to split Continuous Access XP pairs. When the Pairsplit-r command is
selected, the Pairsplit-r pane appears. Use the Pairsplit-r pane to select Pairsplit-r options for the pairs. You
can split a Continuous Access XP pair only after the initial copy operation is complete. For further
P-VOL of pair Priority The MCU starts initial copy operations for LUNs 03, 05,
00, and 04 immediately, starts LUN 01 when one of the
first four initial copy operations is complete, and starts LUN
02 when the next initial copy operation is complete. If
more
Continuous Access XP pairs are created, the MCU
also prioritizes initial copy operations by time requested,
so all pairs in the first group are started before any pair in
the next group is started.
LUN 03 1
LUN 05 2
LUN 00 3
LUN 04 4
LUN 01, 02 5