HP XP Array Manager Software - Manual (Page 37)

data, select shortrange. For details on viewing the usage statistics of external volume groups and
external volumes, see “
Viewing Usage Statistics about External Volume Groups ” on page 66 and
“ Viewing Usage Statistics about External Volumes in External Volume Groups ” on page 67.
• You cannot view the ratio of HP StorageWorks XP Business Copy Software processing and so on
to all processing, and the usage statistics about cache memory. For details on the ratio of XP
Business Copy processing and so on to all processing, see the description about the Business Copy
column in “
Viewing Usage Statistics about Volumes in Parity Groups ” on page 63.
Short-Range Storage
When shortrange is selected, the Auto LUN window displays the statistics collected and stored in
short range. The usage statistics about resources are collected with the interval indicated by Gathering
Interval. The storing period of statistics, which is equivalent to the range of monitoring data that can
be displayed, changes between 8 hours and 15 days depending on the gathering interval.
When shortrange is selected, the Plan button is deactivated. In addition, estimated usage rates of
volumes after migration by XP Auto LUN cannot be displayed.
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 ” on page 16. For details on the relationship between collection interval and the storing period
of the statistics, see “ Monitoring Options Window ” on page 52.
LDEV Tab of the Auto LUN Window
When you click Go, Auto LUN / Perf Ctl / Perf Mon and then Auto LUN on the menu bar of the Remote
Web Console main window, Performance Monitor starts and the Auto LUN window is active.
The Auto LUN 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 ” on page 76.
XP24000/XP20000 Performance Monitor User Guide 37