Enabling system options – HP XP Racks User Manual

Page 31

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Copy Threshold. (For BC/SS, BC Z, Compatible FlashCopy, FS, and Auto LUN) Enable this
system option to temporarily suppress copy operations when the XP7 storage system’s workload
is heavy and to maximize host I/O performance during peak periods.

NOTE:

A service representative must enable this system option.

•

Copy Pace. Enable this system option to determine the rate at which the XP7 storage system
copies data, to suppress copy processing, and to maximize host server I/O performance.

Use one of the following processing-suppression/performance-improvement levels:

◦

(FC Z and FCSE only) FC Slower Copy1

◦

(FC Z and FCSE only) FC Slower Copy2

◦

Copy Pace Ext. Slower1. This is the third most effective
processing-suppression/performance-improvement level.

◦

Copy Pace Ext. Slower2. This is the second most effective
processing-suppression/performance-improvement level.

◦

Copy Pace Ext. None. This is the most effective
processing-suppression/performance-improvement level. This level stops copy processing.

NOTE:

This processing-suppression/performance-improvement level requires more time

to synchronize when you split a pair, which prolongs the time that the pair is in the process
of being Quick Split (“PSUS(SP)/PSUS” status) or Steady Split (“COPY(SP)/COPY” status).
If this is a problem, complete one of the following:

–

Minimize the time that the pair status is “PAIR”.

–

Use one of the other copy pace processing-suppression/performance-improvement
levels.

For more information about the methods you can use to split pairs, see

“Pair splitting

methods” (page 46)