HP XP7 Business Copy for Mainframe Systems User Guide (TK913-96001)

Related topics

• “Splitting BC Z pairs” (page 50).

• “Pair splitting methods” (page 49).

Performance planning and calibrating your XP7 storage system

Performing pair tasks, such as creating, splitting, and resynchronizing BC Z pairs, affect host I/O

performance on the XP7 storage system. Calibrate your XP7 storage system before performing

tasks.

You can also maximize host I/O performance.

For more information about the guidelines for maximizing host I/O performance, see “Guidelines

for maximizing host I/O performance” (page 18).

The following is a list of items you can complete to calibrate your system:

• Host I/O performance versus number of BC Z pairs. Compare the importance of host I/O

performance with the number of BC Z pairs and the copy pace.

Assigning multiple S-VOLs to a P-VOL uses more system resources and lowers performance.

• Load sharing on parity groups.

Assign S-VOLs to newly installed parity groups. Overloading the XP7 storage system

increases parity groups, cache, channel adapters (CHAs), and/or disk adapters (DKAs).

◦

◦ Evenly distribute the P-VOLs and S-VOLs in the parity group, rather than containing a

concentration of one or the other.

◦ If you plan to simultaneously perform multiple pair tasks, place the BC Z pairs in different

parity groups.

◦ To perform a copy operation on multiple BC Z pairs in the same parity group, perform

the operation on one pair at a time.

• Quick Restore. You can maximize performance when you restore pairs using Quick Restore

(see “Workflow for maximizing Quick Restore performance” (page 19)).