how to set the kernel parameters in hpux

[senthil_kumar_1]

Hi

I am using hpux 11.00 and 11.11.

I knew "how to set the kernel parameters in linux".

The file "/etc/sysctl.conf" is used to set the kernel parameters in linux.

Like this how to set the kerner parameters in hpux 11.00 and 11.11.

1) what is the file is used to set the kernel parameters?
2) how to view all current kernel parameter settings?
3) How to set the new kernel parameter with out restarting the server?

[George_Dodds]

Do a man on kmtune.

Cheers

George

[avizen9]

Hello Senthil,
please refer below good doc,

http://docs.hp.com/en/939/KCParms/KCparams.OverviewAll.html

[Suraj K Sankari]

Hi,

You can change kernel parameter through SAM.
from command line also you can change the parameter.

"Overview of Kernel Configuration Parameters"
See the below link your all answers are there.

http://docs.hp.com/en/B8725-90143/ch13s03.html

or Download the pdf file

http://docs.hp.com/en/B8725-90143/B8725-90143.pdf

See the attache file how to change kernel parameter through command line.

Suraj

[Pete Randall]

Actually this is one of the cases where I prefer to use SAM. The SAM interface has valuable help sections which can explain some of the more obscure kernel parameters and their relationships to other parameters - potentially valuable help in my opinion.


Pete

[Sunny123_1]

Hi Senthil

Best way to use SAM

go to sam > Kernel Configuration > Configurable Parameters.

Or use kmtune.

Regards
Sunny

[Sajjad Sahir]

Dear Senthil

Please check the following link, it is an excellent one

http://docs.hp.com/en/1219/tuningwp.html

thanks and regards

Sajjad Sahir

[johnsonpk]

Hi Senthil,
>>1) what is the file is used to set the kernel parameters?
/stand/system is used to create /set kernal tunables.(changing the system file entries doesnt mean that you have set the kernal tunables on the kernel)
>>2) how to view all current kernel parameter settings?
#kmtune (till 11iv2)
#kctune (v2
and v3)
>>>3) How to set the new kernel parameter with out restarting the server?
Reboot is required for tunables that are static
You can use SAM or change it as belo
(if you are tuning the dynamic parameters using kmtune -s = it will have immediate effect(not reboor required))
1)Modify the system file either by vi or by command
# kmtune â s dbc_max_pct=35

2)Generate the kernel
after you modified the system file as needed you can generate the new kernel using the
mk_kernel script. The name of the new kernel will be /stand/build/vmunix_test
unless explicitely specified through the -o option. The -s option specifies the system
file to use, /stand/system is the default:
# mk_kernel

3)Schedule kernel update
kmupdate is used to initiate the move of the new kernel (/stand/build/vmunix_test)
and the corresponding files to their appropriate places at the next shutdown or startup.
The current kernel will be copied to /stand/vmunix.prev
# kmupdate

4)the new kernel will be activated by restarting the system:
# cd /
# shutdown â r 0


Rgds
Johnson

[Rahul Rai_1]

Hello Senthil,

Before changing Kernel Parameter be sure there is two type of Kernel Parameter

1) static, where reebot require, to make effective.
2) Dynamic where no need to reebot.

well, sam is the best way to change the kernel parameter, there is some dependencys with other kernel parameters, and it will simply display the formula.

sam > Kernel Configuration > Configurable Parameters

Regards,
Rahul Rai.

[Don Morris_1]

Note that 11.0 had no Dynamic tunables, only Static. (11.11 introduced Dynamic tunables).