Viewing Write Pending And Cache Memory Usage Statistics; Example Of Drr Usage Rates Displayed In The List - HP XP20000 User Manual

6. To display a graph that illustrates changes in usage rate for DRRs, select the desired DRRs in the
list and then click Draw.
NOTE:
The range of monitoring and the gathering interval affects the time period represented by a
graduation on the horizontal axis.
Figure 26 Example of DRR Usage Rates Displayed in the List
.
The list displays the following items:
: When the green checkmark icon
changes in usage rate for the DRR.
ID: This column displays ID numbers for DRRs.
Usage:
The Ave. (Total) column displays the average usage rate in the specified period.
The Max. column displays the maximum usage rate in the specified period.

Viewing Write Pending and Cache Memory Usage Statistics

Performance Monitor provides statistics about write pending rates. A write pending rate indicates the
ratio of write-pending data to the cache memory capacity. Performance Monitor displays the average
and the maximum write pending rate in a specified period. When you select shortrange for storing
period of statistics, Performance Monitor also displays the average and the maximum usage statistics
about the cache memory in a specified period. In addition, Performance Monitor can display a graph
that illustrates changes in write pending rate or usage statistics of the cache memory within that period.
NOTE:
The data written to the Cache Residency cache area is not included in the write pending rate field.
To view the write pending rate or usage statistics of the cache memory:
1. Ensure that the Auto LUN window is displayed.
2. In the tree, click the Physical tab.
3. In the list above the tree, select the storing period of statistics from longrange and shortrange for
display.
For details on the types of storing period of statistics, see
Ranges" on page 16.
72 Performance Monitor Operations
is displayed on the left of a DRR, the graph illustrates
"Understanding Statistical Storage