HP StorageWorks XP Remote Web Console Software - Manual (Page 266)

9-2 Chapter 9 Usage Monitor Operations
Hitachi Universal Replicator for IBM /OS User’s Guide
Reviewing the Usage Monitor Window
The Usage Monitoring window enables you to collect I/O statistics for all
volumes to be monitored on the connected storage system. The I/O statistics
that are displayed in the window are collected by Performance monitor. The
Usage Monitoring is able to display the data of remote copy operations. At
each data sampling time interval that is specified from Performance Monitor,
the usage monitoring window collects 1,440 pieces of data for each volume
and up to 1,440 pieces of data can be collected for entire volumes to be
monitored.