HP XP Racks - Manual (Page 17)

◦ If you plan to simultaneously perform multiple pair tasks, place the BC pairs in different
parity groups.
◦ To perform a copy operation on multiple BC pairs in the same parity group, perform the
operation on one pair at a time.
•
If you plan to simultaneously use multiple software applications, make sure that your XP7
storage system is configured for optimal performance, such as sufficient cache. Concurrent
use affects the performance and operation of the other software applications.
For more information about configuring your XP7 storage system for optimal performance,
contact HP Technical Support.
•
If you plan to use AIX host servers, for best performance, place the P-VOLs on an AIX host
server and the paired S-VOLs on another.
Using a single AIX host server for the P-VOLs and S-VOLs changes the P-VOL and S-VOLs to
the same PVID when you create or resynchronize the BC pairs. If the PVIDs are the same and
you reboot the host server, the volumes can be misidentified. For example, the S-VOL can be
identified as the P-VOL.
•
Quick Restore. You can maximize performance when you restore pairs using Quick Restore
(see
“Workflow for maximizing Quick Restore performance” (page 18) ).
Related topics
•
“System options that affect performance” (page 30) .
•
“BC pair creation” (page 34) .
•
“Splitting BC pairs” (page 45) .
•
“Resynchronizing or restoring BC pairs” (page 55) .
•
“Pair user tasks during system and device maintenance” (page 74) .
•
“Sharing volumes with Cache Residency” (page 23) .
•
“Types of pair resynchronization” (page 52) .
Guidelines for maximizing host server I/O performance
Creating, splitting, and resynchronizing pairs affects host server I/O performance.
Use the following guidelines to maximize host server I/O performance:
•
If you are creating BC pairs, complete one or more of the following:
Create the pair when the I/O load is light.
For more information about checking I/O performance-related information, see the HP
XP7 Remote Web Console User Guide.
◦
◦ Limit the number of pairs that you simultaneously create.
•
If you are creating, splitting, or resynchronizing BC pairs, select a slower copy pace. You can
enable the system option for copy pace or you can select a specific copy pace while performing
the task.
For more information:
◦ About enabling the system option for copy pace, see “Enabling system options” (page 31) .
◦ About selecting a copy pace while creating BC pairs, see “Creating BC pairs” (page 36) .
Performance planning and calibrating your XP7 storage system 17