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I/O rate for parity groups and external volume groups (When the Subsystem folder is selected):

I/O rate for parity groups or external volume groups (When the Box 1 folder is selected):

I/O rate for volumes:

Note:

It is possible that the I/O rate for a parity group or an external volume group is not equal to the

sum ofthe I/Oratefor each volume in that group. This is becausethe Auto LUN window omits fractions

below the decimal point when displaying the I/O rate for each volume.

Note

: If there is no volume in a parity group, hyphens (-) are displayed in place of performance

statistics on a parity group.

Figure 30 I/O Rates for Disks

Thelistdisplaysthe following:

•

: When the green checkmark icon is displayed on the left of an item, the graph displays

workload statistics about the parity group, the external volume group, or the volume.

• PG: Indicates the parity group ID or the external volume group ID. If the ID starts with the letter

E, the group is an external volume group. If the ID starts with the letter V or X,the groupis

aV-VOL group.

• LDEV: Indicates the volume ID. If the ID ends with the symbol #, the volume is an external volume.

If the ID ends with the symbol V or X, the volume is a virtual volume.

• Emulation: Indicates the emulation type.

• IO Rate: Indicates the number of I/O requests to the parity group, the external volume group,

or the volume per second.

• Read: Indicates the number of read requests to the parity group, the external volume group,

or the volume per second.

• Write: Indicates the number of write requests to the parity group, the external volume group,

or the volume per second.

• Read Hit: Indicates the read hit ratio.

• Write Hit: Indicates the write hit ratio.

• Back Trans.: Indicates the number of data transfers per second between the parity group (or the

external volume group, or the volume) and the cache memory.

• Response Time: This column indicates the time for replying from the parity group, the external

volume group, or the volume when I/O accesses are made from the host to them. The unit is

milliseconds. The average response time in the period speciﬁed at Monitoring Term is displayed.

Note:

For the mainframe volume or the parity groups that contain mainframe volumes, the values

of Response Time are always 0.

XP24000 Performance Monitor User's Guide

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Hp XP Array Manager Software Manuale Utente Pagina 63