Hp XP Array Manager Software Manuale Utente Scaricare il pdf (Pagina 60)

•The Ave. (Total) column displays the average write pending rate for the speciﬁed period.

•The Moment Max. column displays the maximum write pending rate for the speciﬁed period.

Viewing Usage S

tatistics about Access Paths

The channel ada

pters (CHAs) and the disk adapters (DKAs) transfer data to the cache switch (CWS)

and the shared memory (SM) when I/O requests are issued from hosts to the storage system. In some

conﬁgurations, DKAs are called array control processors (ACPs). Also, the cache switch transfers data

to the cache memory.

Performance M

onitor monitors these data transfer paths and lets you view the average and the maximum

usage rate fo

r the paths in a speciﬁed period. Performance Monitor also displays a graph that illustrates

changes in path usage within that period.

To view usage statistics about paths:

1. Ensure that t

he Auto LUN window is displayed.

2. In the tree, click the Physical tab.

3. In the drop-down 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

“Understan

ding Statistical Storage Ranges” on page 15.

When you view usage statistics about paths, the items displayed in the list by selecting

longrange and shortrange are the same.

4. In the tree, double-click the Access Path Usage folder.

5. Do one of the following:

•To check u

sage statistics about paths between adapters (CHAs and DKAs) and the cache

switch, s

elect Adapter-CSW, from below the Access Path Usage folder.

• To check usage statistics about paths between adapters (CHAs and DKAs) and the shared

memory, select Adapter-SM, from below the Access Path Usage folder.

• To check usage statistics about paths between cache switches and the cache memory, select

CSW-Cache, from below the Access Path Usage folder.

The list on the right displays the average and maximum usage rate for the speciﬁed paths

(Figur

e29 on page 61). The displayed statistics are the average and the maximum usage 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).

6. To dis

play a graph that illustrates changes in usage statistics about paths, select the desired

paths in the list and then click the Draw button.

Note:

The range of monitoring and the gathering interval affects the time period represented by

agra

duation on the horizontal axis.

Performance Monitor Operations

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Hp XP Array Manager Software Manuale Utente Pagina 60

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