HP XP Array Manager Software - Manual (Page 16)

Software, and Hitachi Universal Replicator™ for Mainframe. The displayed contents are the same as
those displayed in the Usage Monitor windows of each remote copy function.
The Export Tool enables you to save information on the Auto LUN window into files, so you can use
spreadsheet or database software to analyze the monitoring results. For detailed information about
the Export Tool, see “
Overview of Export Tool ” on page 24 and Chapter 6 on page 99.
Understanding Statistical Storage Ranges
Performance Monitor has two kinds of periods (ranges) for collecting and storing statistics: short range
and long range. The difference of the two ranges and the statistics at which they are targeted is as
follows:
• Storing in short range
If the number of CUs to be monitored is 64 or less, Performance Monitor collects statistics at a
user-specified interval that is between 1 and 15.
If the number of the CUs to be monitored is 65 or more, Performance Monitor collects statistics at
a user-specified interval that is 5, 10 or 15 minutes, and stores them between 8 hours and 1 day.
All the statistics that can be monitored by Performance Monitor are collected and stored in short
range.
• Storing in long range
Performance Monitor collects statistics at fixed 15-minute intervals, and stores them for 3 months
(that is, 93 days).
The usage statistics about resources in the storage system are collected and stored also in long
range, in parallel with in short range. However, some of the usage statistics about resources
cannot be collected in long range.
The Auto LUN window can display the statistics within the range of the storing periods above. You
can specify a part of the storing period to display the statistics on the lists and graphs of Performance
Monitor.
All statistics, except some information related to XP Auto LUN, can be displayed in short range (for
the storing period corresponding to the setting for the collecting interval) on Auto LUN window. In
addition, usage statistics about resources in the storage system can be displayed in both short range
and long range because they are monitored in both ranges. When you display usage statistics about
resources, you can select the displayed range.
For more information on using XP Auto LUN, see the HP StorageWorks XP24000/XP20000 Auto
LUN Software User Guide.
For more about statistics that can be monitored in short and long ranges, see the description of Auto
LUN window in “
Performance Monitor Window ” on page 31. For more about the relationship between
collection interval and the storing period of the statistics, see “ Monitoring Options
Window ” on page 52.
Parity Group Usage Statistics
A parity group is a group of hard disk drives (HDDs) that form the basic unit of storage for the storage
system. All HDDs in a parity group must have the same physical capacity. The storage system supports
three types of parity groups as follows:
• RAID-1 parity group
A RAID-1 parity group consists of two pairs of HDDs in a mirrored configuration.
• RAID-5 parity group
About Performance Monitor 16