HP XP Racks - Manual (Page 43)

Suppressing update copy operations during pair creation
You can suppress update copy operations after you create pairs. Suppressing update copy
operations keeps the P-VOL and S-VOL unsynchronized and reduces the effect on host I/O
performance.
Prerequisite: The pair status is “DUPLEX”.
•
Enable the Swap & Freeze system option.
For more information about how to enable this system option, see “Enabling system options”
(page 35) .
Related topics
•
“System options that affect performance” (page 34) .
Workflow for setting up pair configurations for BC Z
Use the following workflow to configure pairs for BC Z:
1. Create pairs with different numbers of S-VOLs.
Open the Select Pair Configuration window of the Create Pairs wizard.
For Number of Secondary Volumes, select the number according to the pair with the highest
number of S-VOLs, even when some pairs do not have many S-VOLs.
For more information about creating pairs, see “Creating BC Z pairs” (page 39) .
2. Remove the unwanted volumes.
For an example, see “???TITLE??????TITLE???Example 3: Workflow for simultaneously creating
a pair with two S-VOLs and another with one S-VOL” .
Example 1: Workflow for creating a pair
You want to create a pair using one P-VOL and one S-VOL. For Number of Secondary Volumes,
select 1.
You want to use one P-VOL and three S-VOLs (the maximum). For Number of Secondary Volumes,
select 3.
Example 2: Adding a second S-VOL to an existing pair
In this example, you want to add a new S-VOL to an existing pair, as illustrated in the following
image. In this case, for Number of Secondary Volumes, select 2.
BC Z pair creation 43