HP XP P9500 Storage - Manual (Page 33)

Related information
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“Removing reserve attribute from a volume ” (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 33) .
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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 PAIR
status. Differential data is not copied to the new secondary volume. Use the Swap&Freeze
option when you want to keep secondary volumes unchanged after the quick restore operation.
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Host I/O Performance. Increases I/O performance while suppressing copy processing. This
results in longer copy time.
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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:
◦ Business Copy
◦ Business Copy Z
◦ Compatible FlashCopy
◦ Snapshot
◦ Auto LUN
NOTE: The Copy Threshold option must be enabled by your service representative. You can
enable other options described here using the Options window in Remote Web Console.
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Copy Pace options. Reduce the effect on host server I/O performance by suppressing copy
processing in PAIR status. The system uses this option when pairs are in PAIR status only. It
has no effect when the pair is in other statuses.
You can choose from three levels of processing-suppression/performance-improvement:
◦ Copy Pace Ext. None (usable since program version 70-03-01-xx/xx). This is the most
effective option—stops copy processing. With this option, note that synchronization when
a pair is split tends to be slower, which prolongs the time that the pair is in PSUS(SP)/PSUS
or COPY(SP)/COPY status. If this poses a problem, either minimize the time that the pair
is in PAIR status so that synchronization at the pair split does not require so much time,
or use one of the other Copy Pace options.
◦ Copy Pace Ext. Slower2—2nd most effective
◦ Copy Pace Ext. Slower1—3rd most effective
Setting performance options
1. In the tree, click Replications > Local Replications. In the Local Replication window, click Edit
Local Replica Options.
2. In the Edit Local Replica Options window, for System Type, select Business Copy.
System options that affect performance 33