HP XP24000/XP20000 Business Copy Software User Guide (T5213-96034, November 2011)

Threshold option temporarily stops the copy operations when the load of the storage system is
heavy. If you set this option, you can minimize the degradation of host I/O performance by
temporarily stopping XP Business Copy copy operations when the storage system load is heavy.
XP Business Copy has another option called the Host I/O Performance option, which maintains
host I/O performance (response). The Host I/O Performance option suppresses the copy operations
regardless of the status of the storage system. However, the Copy Threshold option is effective only
when the storage system load is heavy. When the Copy Threshold option is in effect, all the XP
Business Copy copy operations stop.
For information about setting the Host I/O Performance option, see (page 23). For information
about setting the Copy Threshold option, call HP technical support.
Copy operations that are stopped by the Copy Threshold option will resume when the load of the
storage system becomes light. If this option is valid, the copy operation and the copy operations
of the following program products will stop when the load of the storage system is heavy:
• ShadowImage for Mainframe
• HP XP for FlashCopy Mirroring Software
• HP XP for FlashCopy Mirroring V2 Software
• HP XP Snapshot Software
• HP XP Auto LUN Software
24 About XP Business Copy Operations