Hitachi MK-96RD617-08 - Manual (Page 51)

Using the Performance Manager GUI 4-9
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
The usage statistics for a same term might be slightly different between
selecting shortrange and longrange because the monitoring precision of
these two interval types differs.
For details on the types of storing period of statistics, see Understanding
Statistical Storage Ranges. For details on the relationship between collection
interval and the storing period of the statistics, see Monitoring Options Window.
LDEV Tab of the Performance Monitor Window
When you click Go, Performance Manager and then Performance
Management on the menu bar of the Storage Navigator main window ,
Performance Monitor starts and the Performance Management window is
active. The Performance Management window includes the LDEV tab,
which lets you view statistics about disk access performance. For example, the
window displays the I/O rate (the number of I/Os per second), the transfer
rate (the size of data transferred per second), the average response time for
parity groups and volumes.
For details on how to use this window, see Monitoring Hard Disk Drives.
Figure 4-5 LDEV Tab of the Performance Management Window
When the LDEV tab is active, the Performance Management window
contains the following items: