HP P9000 Business Copy for Mainframe Systems User Guide (AV400-96386, October 2011)

real time. As a result, multiple write requests to pools may cause excess of the BC Z license
capacity. You can only use the license capacity that you purchased.
When your BC Z volumes exceed license capacity, you are allowed to use the volumes for
additional 30 days. After that, BC Z operations can no longer be performed, except for
deleting pairs.
The following table shows volumes and capacities that are counted as the usage capacity of
Business Copy Z. The total capacity of the following must be less than the capacity that you
purchased.
Table 2 The volumes and capacities to be added to the usage capacity of Business Copy Z
Capacity to be addedVolume to be added
Normal-VOL or THP
V-VOL
The kind of the volumesProgram product
Volume capacityNormal VOLS-VOLBusiness Copy Z
Pool capacity that the
volume is using
THP V-VOL
Volume capacityNormal VOLT-VOL
Pool capacity that the
volume is using
THP V-VOL
Volume capacityNormal VOLReserved-VOL
Pool capacity that the
volume is using
THP V-VOL
The word "Normal-VOL" in the above table means an internal volume or an external volume that
is not specified as a Thin Provisioning Z volume. Besides, external volumes refer to internal volumes
that are mapped to volumes in external storage systems by External Storage.THP-VOL is a virtual
volume that is used in Thin Provisioning Z.
Planning pair volumes
You must create volumes for S-VOLs and T-VOLs prior to creating pairs. Review system requirements
for pair volumes in Table 1 (page 10). Also, the following options can be used:
• Before you create a pair, you can reserve a volume as a T-VOL. This insures that no I/O occurs
in the reserved volume before creating a pair. Reserved volumes may only be used as T-VOLs.
(With TSO or ICKDSF commands, T-VOLs are required to be offline to the host; therefore, they
do not need to be reserved.)
• If you use Business Continuity Manager, you can place a group of pairs in a copy group.
Using the copy group, you can perform pair operations on all the pairs in the group at the
same time, including the At-Time Split operation with which you can specify the split time. See
the HP P9000 for Business Continuity Manager User Guide for information on setting up
consistency groups and performing pair operations.
If you use PPRC, you can split the pairs in a consistency group, though the At-Time Split feature
is not available.
Planning number of pairs
This section provides instructions for calculating the number of system resources required for one
Business Copy Z pair. With this information you can calculate the maximum number of pairs.
When you create pairs, differential tables (tables managing differential bitmaps) and pair tables
are required. These must be available in sufficient number to handle all the pairs you will create.
HP Confidential12 Requirements and planning