HP XP Array Manager Software - Manual (Page 62)

This section describes how to view the statistics about disk access performance. Before taking
the following s, you need to start monitoring in accordance with the procedure described in
“ Starting and Stopping Storage System Monitoring ” on page 49 and obtain the usage statistics.
Viewing I/O Rates for Disks
Performance Monitor monitors hard disk drives and measures I/O rates (that is, the number of disk
I/Os per second).
To view I/O rates:
1. Ensure that the Auto LUN window is displayed.
2. Click the LDEV tab ( Figure 9 on page 35).
The tree displays a list of parity groups and external volume groups.
3. Select IOPS from the drop-down list on the right side of the window.
4. In the tree, do one of the following:
• To
view the I/O rate for each parity group and external volume group, select the Subsystem
folder or a Box folder.
The list on the right displays the I/O rate for each group ( Figure 30 on page 63).
Note: If you select the Subsystem folder, the list displays all parity groups and external
volume groups. To narrow the number of groups to be displayed in the list, select a Box
folder. For example, if you select the Box 1 folder, the list displays only the parity groups
whose IDs start with 1-.
• To view the I/O rate for each volume, select the parity group or external volume group
that contains the volumes.
The list on the right displays the I/O rate for each volume in the selected group
( Figure 30 on page 63).
The displayed statistics are the average and the maximum I/O rates for the period specified
in the From and To boxes.
Note: If you change the date and time in the From and To boxes and then click the Apply button,
Performance Monitor recalculates usage rates and updates information in the list. To change
the date and time in From and To boxes, use the arrow buttons and the sliders (for details, see
“ Auto LUN Window, Physical Tab ” on page 29).
5. To display a graph to find out how the I/O rate has been changed, take the following steps;
a. In the list, select the parity group(s), the external volume groups, or the volume(s) that
you want.
b. Use the drop-down list at the right side of the list to select the type of information that
you want to view in the graph. For details on the information that can be displayed, see
Table 4 on page 37 in “ LDEV Tab of the Auto LUN Window ” on page 34.
c. Click the Draw button.
A graph appears below the list. The horizontal axis indicates the time.
Caution: If the graph does not display changes in the I/O rate (for example, if the line in
the graph runs vertically), it is recommended that you change the value in the Chart Y Axis
Rate drop-down list. For example, if the largest value in the list is 200 and the value in
Chart Y Axis Rate is 100, you should select a value larger than 200 from Chart Y Axis Rate.
d. To view more detailed information in the graph, use the drop-down list to the right of the
list to select the type of information that you want. Next, select the Detail check box at the
lower right of the list and then click the Draw button. The detailed graph contents change as
described in Table 5 on page 38 in “ LDEV Tab of the Auto LUN Window ” on page 34.
Caution: If more than one parity group or volume is selected in the list, you cannot select
the Detail check box to view detailed information.
62 Performance Monitor Operations