HP XP P9500 Storage - Manual (Page 15)

S-VOL P-VOL
3390-MB •
3390-MC •
3390-M
• 3390-MA
3390-A 3390-A
None supported 3390-V
Note: Combinations not listed are not supported.
License capacity requirements
The total capacity of pair volumes must be less than the maximum volume capacity licensed to you.
After operations begin, you should be aware of capacity requirements in order to keep volumes’
total size within purchased capacity.
•
P-VOLs, S-VOLs, and volumes are reserved for use as S-VOLs must have licensed capacity.
•
If you are using a volume for multiple purposes, the capacity of the volume is counted only
once. You do not need to multiply the capacity by the number of purposes for which it is used.
When your BC Z volumes exceed license capacity, you are allowed to use the volumes for additional
30 days. After that, you cannot perform BC Z operations except to delete pairs.
For more information, see the HP XP P9000 Remote Web Console User Guide.
Planning pair volumes
You must create volumes for P-VOLs and S-VOLs prior to creating pairs. For more information about
the system requirements for pair volumes, see
“System requirements” (page 11) . Also, you can use
the following options:
•
Before creating a pair, you can reserve a volume as an S-VOL. This ensures that an I/O does
not occur in the reserved volume before creating the pair. You can only use reserved volumes
as S-VOLs. (With TSO or ICKDSF
•
commands, T-VOLs are required to be offline to the host; therefore, you do not need to reserve
them.)
•
If you use BCM, 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
consistency-group pair-split operations at specified times.
For more information about setting up consistency groups and performing pair operations,
see the Business Continuity Manager User Guide.
If you use PPRC, you can split the pairs in a consistency group, but At-Time Split is not available.
Planning number of pairs
You can calculate the number of system resources required for a BC Z pair. With this information
you can calculate the maximum number of pairs allowed on your system.
Differential tables (tables managing differential bitmaps) and pair tables are required to create
pairs. You must supply an adequate number of tables to handle all the pairs you plan to create.
The number of differential and pair tables that are present in the system depends on additional
shared memory that is installed. Therefore, you must ensure that you have sufficient additional
shared memory to handle the number of pairs.
License capacity requirements 15