HP XP Array Manager Software - Manual (Page 53)

• The Rnd. column indicates random read rates. A random read rate is the ratio of random
read requests to read and write requests.
• The Seq. column indicates sequential read rates. A sequential read rate is the ratio of
sequential read requests to read and write requests.
• Write Rate:
• The
Rnd. column indicates random write rates. A random write rate is the ratio of random
write requests to read and write requests.
• The Seq. column indicates sequential write rates. A sequential write rate is the ratio of
sequential write requests to read and write requests.
• Parity Gr. Use[Exp]: This item is displayed only when you select longrange for the storing period
of statistics. Parity Gr. Use[Exp] assumes the volume might be migrated out of the parity group (or
uninstalled) and indicates expected (estimated) average and maximum usage rates of the parity
group. The Ave. (Total) column indicates an estimated change in the average usage rate. The
Max. column indicates an estimated change in the maximum usage rate.
For example, if the Ave. (Total) box for the volume 0:01 displays 20 -> 18, the average usage
rate of the parity group that the volume belongs to is 20 percent. If the volume were migrated out
of the parity group, the average usage rate of that group is expected to drop to 18 percent.
• Business Copy: This item is displayed only when you select shortrange for the storing period of
statistics. Business Copy indicates the percentage of the processing of the following programs to
all the processing of the physical drives, for each volume. This value is found by dividing access
time to physical drives by the following programs by all the access time to physical drives.
• ShadowImage for Mainframe
• Business
Copy
• Compatible FlashCopy
• Compatible FlashCopy V2
• Auto
LUN
• HP StorageWorks XP Snapshot
The Ave. (Total) column displays the average percentage of processing of the above programs in
the specified period.
The Max. column displays the maximum percentage of processing of the above programs in
the specified period.
For details on the above programs, see their respective user's guides.
• CLPR: This column indicates numbers and names of CLPRs corresponding to each parity group
which the volume belongs to, in the format CLPR-number:CLPR-name. For details on CLPRs, see HP
StorageWorks XP24000 Disk/Cache Partition User’s Guide.
Viewing Usage Statistics about External Volume Groups
Performance Monitor monitors external volume groups and lets you view the usage statistics of external
volume groups in a specified period. Performance Monitor also displays a graph that illustrates changes
in the usage statistics of external volume groups within that period.
Note: You can view the usage statistics about external volume groups only when you select shortrange for
the storing period of statistics.
To view usage statistics about external volume groups:
1. Ensure that the Auto LUN window is displayed.
2. In the tree, click the Physical tab.
3. In the drop-down list above the tree, select shortrange for the storing period of statistics.
If you select longrange, no statistics appears in the list.
4. In the tree, select the External Group folder.
The list on the right displays usage statistics about external volume groups ( Figure 22 on page 54).
The displayed statistics are the usage statistics for the period specified in the From and To boxes.
Notes:
XP24000 Performance Monitor User's Guide 53