topic Re: shmmax value in Operating System - HP-UX

shmmax value

himacs — Tue, 23 Feb 2010 08:48:40 GMT

Hi Admins,

I want to tune shmmax value equal to ram.

currently i have 6 gb ram and shmmax is 1073741824.

How can i calculate the new shmmax value

whether its like 1073741824*6

Please suggest on this

Regards
himacs

Re: shmmax value

johnsonpk — Tue, 23 Feb 2010 08:54:29 GMT

Hi Himacs
Currently you have 1 Gb (ie 1073741824 bytes)

>>whether its like 1073741824*6
Yes , You are right.

Johnson

Re: shmmax value

himacs — Tue, 23 Feb 2010 09:00:39 GMT

Hi Johnson,

Thanks for the response

So what vakue i have to give with kctune or SAM..

kctune shmmax=?

Please suggest

Regards
himacs

Re: shmmax value

johnsonpk — Tue, 23 Feb 2010 09:13:27 GMT

kctune shmmax=6442450944

Re: shmmax value

Johnson Punniyalingam — Tue, 23 Feb 2010 09:17:52 GMT

Hope you have also "make_tape_recovery" for the OS backup.

Better if you could >SAM

SAM ->Kernel Configuration Configurable-> Parameters->Select shmmax->Actions -> Modify Configurable Parameter -> specify the value 1073741824*6 =

Re: shmmax value

madhuchakkaravarthy — Tue, 23 Feb 2010 09:24:55 GMT

shmmax is dynamic so reboot is not necessary,,

but it is always welcome to take the os backup.

if not have the copy of vmunix and system in stand

regards

MC

Re: shmmax value

johnsonpk — Tue, 23 Feb 2010 09:41:22 GMT

BY default kctune will prompt you for take a current kernel config backup

if you want to revert back the changes, you can use kconfig -l backup
if you want the system to be booted with the backed up kernel

use kconfig -n backup and reboot the server

Re: shmmax value

himacs — Tue, 23 Feb 2010 10:12:07 GMT

Hi All,

I have changed the shmmax value to 6GB thro SAM.There was no renoot since the same is dynamic.

Thanks to johnsonpk for value calculating suggestion

regards
himacs

Re: shmmax value

Johnson Punniyalingam — Tue, 23 Feb 2010 10:19:20 GMT

Congrats .!!

does the new value changes reflected ..? You can with below command

# kctune |grep shmmax

. if everything looks good. You may wish to close thread.avoid multiple posting :)

Re: shmmax value

himacs — Tue, 23 Feb 2010 10:23:17 GMT

Hi Johnson,

Changes reflected in server.

Thanks for ur support

Regards
himacs