HP XP Racks - Manual (Page 19)

Use the following guidelines to maximize host I/O performance:
•
If you are creating BC Z 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 Z 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 35) .
◦
About selecting a copy pace while creating BC Z pairs, see “Creating BC Z pairs”
(page 39) .
◦ About selecting a copy pace while splitting BC Z pairs, see “Splitting BC Z pairs”
(page 50) .
◦ About selecting a copy pace while resynchronizing BC Z pairs, see “Resynchronizing or
restoring BC Z pairs” (page 58) .
Workflow for maximizing Quick Restore performance
Use the following workflow to maximize the performance of restoring pairs using Quick Restore:
1. Set the same RAID level and HDD device type.
For more information about HDD and HDD device types, see the HP XP7 Remote Web Console
User Guide.
2. Complete one of the following:
•
Place the P-VOL and S-VOLs into the same cache (location).
•
Complete the following:
a. Release specific data areas on the LDEV from Cache Residency cache.
b. Restore the pairs using Quick Restore.
For more information about restoring pairs using Quick Restore, see “Reverse
resynchronization” (page 56) .
c. Place the LDEVs into cache.
For more information about Cache Residency, including how to place LDEVs into cache
and release specific data areas on LDEVs from cache, see the HP XP7 Performance for
Open and Mainframe Systems User Guide.
3. Restore the pairs using Quick Restore.
For more information about restoring pairs using Quick Restore, see “Reverse resynchronization”
(page 56) .
4. Resume the original RAID levels.
For more information about resuming RAID levels, see “Workflow for setting the RAID level”
(page 61) .
Performance planning and calibrating your XP7 storage system 19