Workflow For Maximizing Quick Restore Performance; Splitting Pairs Using Consistency Groups - HP XP7 User Manual

Use the following guidelines to minimize the impact of pair operations on host I/O performance:
If you are creating BC Z pairs, try one or both 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
34).
◦
About selecting a copy pace while creating BC Z pairs, see
38).
◦
About selecting a copy pace while splitting BC Z pairs, see
50).
◦
About selecting a copy pace while resynchronizing BC Z pairs, see
restoring BC Z pairs" (page

Workflow for maximizing Quick Restore performance

Use the following workflow to maximize the performance of restoring pairs using Quick Restore:
1. Use the same RAID level and HDD device type for the P-VOL and S-VOL.
For more information about HDD and HDD device types, see the HP XP7 Remote Web Console
User Guide.
2. Perform one of the following actions:
Place the P-VOL and S-VOLs into the same cache partition if they are in different partitions.
If Cache Residency is being used, release specific data areas on the LDEV from the Cache
Residency cache, and then place the LDEVs into cache using Cache Residency.
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
(page 55).
4. Resume the original RAID levels if they were changed by a reverse resynchronization action.
For more information about resuming RAID levels, see
(page 60).

Splitting pairs using consistency groups

A consistency group lets you perform tasks and change pair status on a group of BC Z pairs. With
consistency group (CG) pair-split, you can simultaneously split all of the pairs in a CG.
57).
"Workflow for setting the RAID level"
"Enabling system options" (page
"Creating BC Z pairs" (page
"Splitting BC Z pairs" (page
"Resynchronizing or
"Reverse resynchronization"
Splitting pairs using consistency groups 17