Maximum Performance with WebSphere Application Server V5.1 on iSeries

Chapter 4. Tools for determining performance problems 29

The upper half of the display provides the following information at a glance:

 The number of jobs currently in the system

 The total capacity of the system auxiliary storage pool (ASP)

 The percentage of the system ASP storage currently in use

 The amount of temporary storage currently in use

 The maximum amount of temporary storage space required since the last initial program

load (IPL)

 The percentage of machine addresses used

The lower half of the WRKYSSTS display shows:

 The sizes of the memory pools on the system

 The activity level settings per pool basis

 The faulting and paging rates for each pool for

– Database objects

– Non-database objects like program code, work areas, and so on

 Thread state transitions for each pool

To change a pool size, enter a value in the Size field and press the Enter key. If the pool that

is being changed is a private pool, this new pool size and the activity level shown in the

Maximum Active column are both used to change the subsystem description.

4.2.2 WRKDSKSTS command

You use the WRKDSKSTS command to observe how the disks are performing. Figure 4-2

shows an example of Work with Disk Status display.

Figure 4-2 WRKDSKSTS display

Work with Disk Status SYSTEMA

07/07/04 12:42:31

Elapsed time: 00:00:08

Size % I/O Request Read Write Read Write %

Unit Type (M) Used Rqs Size (K) Rqs Rqs (K) (K) Busy

1 6718 13161 25.7 20.5 4.0 .1 20.4 4.0 4.0 5

2 6718 13161 25.6 14.6 4.2 .1 14.4 4.0 4.2 5

3 6718 17548 25.6 29.5 5.1 .6 28.9 32.8 4.5 0

4 6718 13161 25.6 10.2 4.8 .3 9.8 10.6 4.5 5

5 6718 13161 25.6 29.7 4.3 .3 29.3 22.6 4.0 5

6 6718 17548 25.6 25.2 5.3 .1 25.0 4.0 5.3 0

7 6718 17548 25.6 18.5 4.5 .2 18.2 12.0 4.4 5

8 6718 17548 25.6 60.4 4.2 .3 60.0 4.0 4.2 5

9 6718 17548 25.6 43.7 5.5 .2 43.4 6.0 5.5 5

10 6718 17548 25.6 39.8 4.3 .3 39.4 22.6 4.1 0

11 6718 17548 25.6 32.0 4.6 .6 31.4 4.0 4.6 11

Bottom

Command

===>

F3=Exit F5=Refresh F12=Cancel F24=More keys