HP XP Racks - Manual (Page 18)

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) ).
Related topics
•
“System options that affect performance” (page 34) .
•
“BC Z pair creation” (page 38) .
•
“Splitting BC Z pairs” (page 48) .
•
“Resynchronizing or restoring BC Z pairs” (page 58) .
•
“Pair user tasks during system and device maintenance” (page 77) .
•
“Sharing volumes with Cache Residency” (page 26) .
•
“Types of pair resynchronization” (page 55) .
Guidelines for maximizing host I/O performance
Creating, splitting, and resynchronizing pairs affects host I/O performance.
18 Business Copy Z system requirements and planning