Guidelines For Maximizing Host I/O Performance - HP XP7 User Manual

Consider the following items for performance planning:
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 the potential
performance.
Load sharing on parity groups.
◦
S-VOLs and P-VOLs should be assigned to different parity groups in case of failure. Make
sure that enough parity groups are used to provision the P-VOLs and S-VOLs and provide
the performance capability desired.
◦
The P-VOLs and S-VOLs should be distributed across the appropriate parity groups. If you
plan to have multiple copies of the same P-VOLs, consider placing the S-VOLs in different
combinations of parity groups.
◦
BC Z can create high levels of internal activity in your HP XP7. Make sure the configuration
is appropriate for the internal and host workload. Items that may help are additional
parity groups, cache adapters, cache, DKAs, and MPBs.
◦
Limit the number of volumes performing initial copy operations provisioned in the same
parity group.
Quick Restore. You can maximize performance when you restore pairs using Quick Restore
(see "Workflow for maximizing Quick Restore performance" (page
For more information about the guidelines for maximizing host I/O performance while performing
pair operations, see
Related topics
"System options that affect performance" (page
"BC Z pair creation" (page
"Splitting BC Z pairs" (page
"Resynchronizing or restoring BC Z pairs" (page
"Information about system and device maintenance" (page
"Sharing volumes with Cache Residency" (page
"Types of pair resynchronization" (page

Guidelines for maximizing host I/O performance

Creating, splitting, and resynchronizing pairs can affect host I/O performance.
16 Business Copy Z system requirements and planning
"Guidelines for maximizing host I/O performance" (page
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