Hp XP Array Manager Software Manuel d'utilisateur télécharger pdf (Page 42)

I/O rate

（

IOPS

）

400

CL1-A

300

200

100

Time

08:00 10:00

If the Detail check box is deselected

Figure 14 The Graphs that Illustrate Changes in Workloads on a Port

ViewingWorkloadStatisticsonanLUPath

When you select LUN ( ) in the tree, select a LUN in the list. select the Draw button, and then select the

Detail check box, the graph displays detailed statistics about workload on the LU path. The detailed

statistics that can be displayed differ depending on items you select in the drop-down list, as explained in

Table 6 on page 42.

Table 6 Detailed Information that can be Displayed in the Graph (Port-LUN Tab)

Select Detail and this Item in the

Drop-Down List

The Graph Contains

IO (the number of I/Os per second)*

• statistics in sequential access mode

• statistics in random access mode

Note

: If the read hit ratio or the write hit ratio is high, random

access mode is used for transferring data instead of sequential

access mode. For example, random access mode is likely to

be used for transferring data to disk areas to which the Cache

Residency Manager function is applied.

Read (the number of read accesses per

second)*

Write (the number of write accesses per

second)*

Read Hit (t

he read hit ratio)

Write Hit (the write hit ratio)

Back Trans. (backend transfer; the

number of I/Os between the cache

memory and hard disk drives)

• the number of data transfers from the cache memory to

hard disk drives (Cache to Drive)

• the number of data transfers from hard disk drives to the

cache memory in sequential access mode (Drive to Cache

Seq.)

• the number of data transfers from hard disk drives to the

cachememoryinrandomaccessmode(DrivetoCache

Rnd.)

*You c

an select this item only when I/O rates are displayed.

Monitoring Options Window

When you click Go, Auto LUN / Perf Ctl / Perf Mon and then Auto LUN on the menu bar of the Remote

Web Console main window, Performance Monitor starts. When you click the Monitoring Options tab, the

Monitoring Options window is displayed. Use it to make settings for obtaining usage rates about hard

disk drives, channel processors, disk processors, etc.

Using the Performance Monitor GUI

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Hp XP Array Manager Software Manuel d'utilisateur Page 42

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