performance problem

[miaoxucheng]

hi ,experts
a question gets me . i use 'sar -u 3 5 ' , i found the %wio is especially high .what's the problem ? does %wio impact the performance of the node ? how to improve it ?
thanks .
------------------------
sar -u 3 5

HP-UX pa1022 B.11.00 U 9000/800 04/11/03

14:58:21 %usr %sys %wio %idle
14:58:24 9 3 77 11
14:58:27 10 2 73 14
14:58:30 7 3 77 14
14:58:33 10 2 71 17
14:58:36 8 2 78 12

Average 9 2 75 14
---------------------------------
pa1022:/ >vmstat 3 5
procs memory page faults cpu
r b w avm free re at pi po fr de sr in sy cs us sy id
2 12 0 136319 434604 30 7 0 0 21 0 0 3140 18863 1934 27 4 70
1 11 0 136126 434553 7 0 0 0 0 0 0 2971 15928 1228 13 2 85
5 11 0 146424 432099 272 20 0 0 1 0 0 2781 20365 1887 54 5 41
5 11 0 146424 432872 195 47 0 0 95 0 0 3073 20641 1822 17 2 81
0 12 0 142777 433141 173 52 0 0 98 0 0 3271 20712 1690 13 4 83

[Steven E. Protter]

Most likey causes:

Too many application/servers running for available membory, swapping is rampant
Too many batch jobs running huge I/O
Incorrect kernel settings.
Short term io hit.
Unbalance disk distribution of a database.

I assume the situation is more or less constant otherwise you would not be posting.

I would recommend collecting some data on your system over a longer period of time, and see if the results are conisting. I am attaching just such a script.

SEP