HP XP P9500 Storage - Manual (Page 35)

Related information
•
“Removing reserve attribute from a volume” (page 55)
Reserving a consistency group
A consistency group number is required when assigning pairs to a consistency group. Once you
have assigned pairs to a consistency group, you can perform pair operations on the pairs in the
group, including At-Time Split.
Prerequisite information
•
The consistency group must be created before reserving it, using BCM.
1. In the tree, click Replications > Local Replications, then click the Consistency Group tab.
2. In the Consistency Group window, click Reserve Maintenance CTGs.
3. In the Reserve Maintenance CTGs window’s Available Consistency Groups table, select the
consistency group you want to reserve and click Add. This action moves the consistency group
to the Selected Consistency Groups table.
4. Click Finish.
5. In the Confirm window, enter a Task Name then click Apply.
Related information
•
“Releasing a reserved consistency group” (page 55)
System options that affect performance
You can enable and disable the following options that affect performance. (To go directly to the
procedure, see
“Setting performance options” (page 36) ).
•
Swap&Freeze. Alters the behavior of the Quick Restore operation. With Swap&Freeze, update
copy operations are suppressed when the Quick Restore is completed and the pair is in DUPLEX
status. Differential data is not copied to the new S-VOL. Use the Swap&Freeze option when
you want to keep S-VOLs unchanged after the Quick Restore operation.
•
Host I/O Performance. Increases I/O performance while suppressing copy processing.
However, be aware that enabling this option results in a longer copy time, slowing copy
processing.
•
Copy Threshold. Temporarily stops copy operations when the workload on the storage system
is heavy. This is done to minimize degradation to host I/O performance during peak periods.
The option performs only when workload is heavy; the Host I/O Performance option suppresses
copy operations at all times regardless of workload level.
When the Copy Threshold Option is enabled, it is effective for all of the following software:
◦ BC
◦ BC Z
◦ Compatible FlashCopy
◦ FS
◦ SS
◦ Auto LUN
Reserving a consistency group 35