Kernal Parm's Help Please

[Germo]

I have been asked by our Informix DBA to find out what the setting are for the following parm's, the problem is that I have never heard of them and I am not too sure how if they do exist they can be altered or shown.

nfiles, semmni, semmns, semmns, shmmax

Any help would be great thanks.

 

[p5wizard]

If memory serves me, those kernel params are not modifiable on AIX. Just assume they are by default big enough to run Informix.


HTH,

p5wizard

 

[hirschaj]

Informix should have an AIX installation/administration guide that would let you know what parameters should be changed. I would look for that as a starting point.


Jim Hirschauer

http://www.aixexpert.com

 

[DSMARWAY]

hi ,

the parameters you have listed are normally under HPUX
operating system

i.e. nfile max number of open files
semmni no. of semaphore indentifiers
semmns max no. of semaphores
shmmax max shared memory segment

Have a look at the AIX part of informix parameters
one other thing you can look at is /etc/security/limits
normally when informix/database fails to start becuse the data/stack area at set too low

description of parameters you can set are in this file
e.g.
fsize - soft file size in blocks
* core - soft core file size in blocks
* cpu - soft per process CPU time limit in seconds
* data - soft data segment size in blocks
* stack - soft stack segment size in blocks
* rss - soft real memory usage in blocks
* nofiles - soft file descriptor limit
* fsize_hard - hard file size in blocks
* core_hard - hard core file size in blocks
* cpu_hard - hard per process CPU time limit in seconds
* data_hard - hard data segment size in blocks
* stack_hard - hard stack segment size in blocks
* rss_hard - hard real memory usage in blocks
* nofiles_hard - hard file descriptor limit

you can set parameters for individual users
e.g nofiles = 4000
data = -1

-1 being unlimited

note:- if you change these parameters and your application gets started by a user , you must stop and start the application for the changes to take affect / logout and log back in

HTH

 

[usige]

Germo,
You don't need to worry about those parms in AIX. These are all dynamic in AIX not like HP or Sun. I've installed and maintained 7 or 8 Informix servers and have never had a problem on those (other than nofiles being to small in some cases). There are thing you might want to tune later depending on if you used raw or cooked file systems but that's a different topic of discussion.

 

[kHz]

Those parameters are not configurable on AIX. That is the nice thing about AIX compared to Solaris. The OS has the settings high enough by default installation there isn't any need to change them.

AHHHHH! AIX! how nice compared to Solaris.