VMM Tuning

[tovohery]

I'm new with AIX and I want to set
minperm to 10% and lru_file_repage=0.
So, what should I do to make this? The below is the result of
# vmstat -v
1474560 memory pages
1410818 lruable pages
1084 free pages
0 memory pools
237596 pinned pages
80.0 maxpin percentage
20.0 minperm percentage
80.0 maxperm percentage
22.7 numperm percentage
321478 file pages
0.0 compressed percentage
0 compressed pages
23.3 numclient percentage
80.0 maxclient percentage
329232 client pages
0 remote pageouts scheduled
36866 pending disk I/Os blocked with no pbuf
42889943 paging space I/Os blocked with no psbuf
2740 filesystem I/Os blocked with no fsbuf
768 client filesystem I/Os blocked with no fsbuf
812 external pager filesystem I/Os blocked with no fsbuf

Any help?
Thanks and regards

 

[mrn]

Why do you want to do that?

The lru_file_repage is maybe a good idea, but don't just make changes without knowing why your making them and without spending some time studying ps and sar stats.

vmo -o lru_file_repage=0

or to make perm use

vmo -p -o lru_file_repage=0


Mike

"Whenever I dwell for any length of time on my own shortcomings, they gradually begin to seem mild, harmless, rather engaging little things, not at all like the staring defects in other people's characters."

 

[tovohery]

My problem is about the oracle database performance.
In oracle forum, they suggest to tune vmm because there was many io in my server and i think that my RAM size doesn't fit my oracle database.
Does this command set also minperm to 10%?

Regards

 

[mrn]

No to set minperm do the following

vmo -o minperm%=10

use vmo -p -o minperm%=10 to make perm (lasts after reboot)

If your really not sure what your doing, get hold of a evaluation copy of sarcheck see

http://www.sarcheck.com

(I'm sure I should be on commission...) It will make tuning suggestions based on sar & ps data collected.

Mike

"Whenever I dwell for any length of time on my own shortcomings, they gradually begin to seem mild, harmless, rather engaging little things, not at all like the staring defects in other people's characters."

 

[tovohery]

If I set
vmo -o minperm%=10

Does it takes effect immediately until the system restart?
Thanks also for the link

Regards

 

[mrn]

Yes it takes effect immediately until reboot.

do vmo -a > /vmob4 to save a copy of your current settings

Mike

"Whenever I dwell for any length of time on my own shortcomings, they gradually begin to seem mild, harmless, rather engaging little things, not at all like the staring defects in other people's characters."

 

[kHz]

vmo -o minperm%=10

To be exact. This will take effect immediately but will not persist across reboot.

vmo -p -o minperm%=10

-p will make it permanent.

When you run 'vmstat -v' pay attention to numperm. You don't want numperm below minperm even if lru_file_repage=0. It may be better to set minperm to 5.