HP XP Array Manager Software - Manual (Page 11)

1 Overview of Performance Monitor
Performance Monitor provides usage statistics about physical hard disk drives, volumes, processors,
or other resources in your storage system. Performance Monitor also provides statistics about workloads
on disk drives and traffic between hosts and the storage system. The Auto LUN window displays a
line graph that indicates changes in the usage rates, workloads, or traffic. You can view information
in the window and analyze trends in disk I/Os and detect peak I/O time. If system performance is
poor, you can use information in the window to detect bottlenecks in the system.
When using Performance Monitor, you must specify the volumes to be monitored in control units (CUs).
Therefore, depending on your storage system configuration, the list may display performance statistics
for some volumes and not display performance statistics for other volumes. This can occur if the range
of used CUs does not match the range of CUs monitored by Performance Monitor.
To correctly display the performance statistics of a parity group and a LUSE volume, specify the
following:
• All volumes that belong to the parity group as the monitoring targets.
• All volumes that make up the LUSE volume as the monitoring targets.
Figure 1 illustrates and simplifies the performance management process.
XP24000/XP20000 Performance Monitor User Guide 11