scan rate - process resources

[amarsafy]

Hi,
I have two questions on AIX 4.3.3:
1. During the backup I get a very high memory scan rate (reaches 600) whether in normal cases its less than 40. what am I may doing wrong?

2. To monitor the resources conumed by each process I use "ps aux", however it gave wrong answers regarding the CPU consumption, what other tool I may use?

Thanks alot
Aly

 

[Morsing]

1. What is memory scan rate?

2. How do you know they're wrong??

Cheers

Henrik Morsing
Certified AIX 4.3 Systems Administration
& p690 Technical Support

 

[amarsafy]

1. scan rate is the number of mameory scaned pages to be swaped due to in-sufficient memory (high scan rate means high memory demanding leading to the fact of lake in memory resources)
2. I made a dummy loop script that consumes all the CPU resources (sar gives 0 Idle) and yet I still see the this script consumes only a very little CPU percentage and even the sum of all the processes is less than 100%

 

[Morsing]

How many processors do you have??

Can you post some vmstat output??

Cheers

Henrik Morsing
Certified AIX 4.3 Systems Administration
& p690 Technical Support

 

[amarsafy]

IBM PSERIES 660 MODEL 6H1
2x750 (2 ways) MHz CPU, 2GB RAM

I'm running my own scripts to gather and get a hourly average, the output is something like that:
(Hour)(RAM utilized %) (scan rate) (free RAM)
0:08 99.9548 14.6064 0.00727273
1:08 99.9783 650.083 0.395455
2:08 99.9853 342.329 0.171818
3:08 99.9747 339.169 0.964545
4:08 99.985 428.483 0.192727
5:08 99.9404 284.044 0.402727
6:08 99.9257 1.46 0
7:08 99.9269 1.48636 0
8:08 99.9279 0.938182 0
9:08 99.9326 1.85364 0
10:08 99.9397 1.09909 0
11:08 99.9188 0.210909 0
12:08 99.9114 0.286364 0
1308 99.9114 2.36636 0.00363636
14:08 99.9028 0.0909091 0

Each reading represents the average of the previous hour as I get a reading every 3 second.