Hp XP Array Manager Software Manuel d'utilisateur télécharger pdf (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 Ra

tes for Disks

Performance M

onitor 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 th

e Auto LUN window is displayed.

Click the LDEV tab (Figure 9 on page 35).

Thetreedisplaysalist of parity groups andexternalvolumegroups.

3. Select IOPS from the drop-down list on the right side of the window.

4. In thetree, do oneofthe following:

•To view the I

/O rate for each parity group and external volume group, select the Subsystem

folder or a

Box folder.

Thelistonthe rightdisplaysthe I/Oratefor 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 th

e I/O rate for each volume, select the parity group or external volume group

that contains the volumes.

Thelistonthe right displaysthe I/Oratefor each volume in theselectedgroup

(Figure 3

0 on page 63).

The displ

ayed 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 LU

NWindow, Physical Tab” on page 29).

5. To disp

lay 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-downlistatthe rightside ofthe list to select the type ofinformation that

you wa

nt 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 gr

aph 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

Char

tYAxis Rate is 100, you should select a value larger than 200 from Chart Y Axis Rate.

d. To v

iew more detailed information in the graph, use the drop-down list to the right of the

lis

tto selectthe type of informationthatyou 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”onpage34.

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.

Performance Monitor Operations

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Hp XP Array Manager Software Manuel d'utilisateur Page 62

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