Hitachi MK-96RD617-08 - Manual (Page 14)

1-2 Overview of Performance Manager
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
Performance Monitor
Performance Monitor lets you obtain usage statistics about physical hard
disk drives, volumes, processors or other resources in your storage system.
Performance Monitor also lets you obtain statistics about workloads on disk
drives and traffic between hosts and the storage system. The Performance
Management 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).. Therefore, depending on your disk subsystem
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 performance statistics of a parity group and a LUSE
volume, you must specify as follows:
• Specify all volumes belonging to the parity group as the monitoring targets.
• Specify all volumes making up the LUSE volume as the monitoring targets.