topic Re: setting kernel parameters in Operating System - HP-UX

setting kernel parameters

Pushpa Kumari K.H — Wed, 09 May 2007 03:42:28 GMT

Hi All,

Could you please tell me how to change the kernel configuration parameters like MAXDSIZ_64
KSI_ALLOC_MAX ..
Could you also suggest me some link which describes all the kernel parameters.

Thanks in Advance.
Pushpa

Re: setting kernel parameters

Oviwan — Wed, 09 May 2007 03:49:17 GMT

Hey

use sam. there is also a description for each parameter.

#sam

Regards

Re: setting kernel parameters

Ivan Krastev — Wed, 09 May 2007 03:49:47 GMT

See this docss:
Configurable Kernel Parameters
http://docs.hp.com/hpux/onlinedocs/os/KCparams.OverviewAll.html

Guidelines for Tuning HP-UX Kernel Parameters
http://docs.hp.com/en/J2716-90017/ch06s05.html

regards,
ivan

Re: setting kernel parameters

Rita C Workman — Wed, 09 May 2007 11:13:52 GMT

Hello Pushpa,

If your not familiar with where to change the kernel parms, then may I suggest you begin your practice and learning of kernel tuning on a test box ! You don't want to practice on a live production box......it can be deadly...

Here is where you can read up on the parms:

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

Regards,
Rita

Re: setting kernel parameters

Doug O'Leary — Wed, 09 May 2007 13:07:09 GMT

Hey;

It depends on your os level. There is a list of kernel parameters somewhere under http://docs.hp.com. You'll have to search for them a bit. As a previous poster mentioned, they're also available under sam - one of the very few valid reasons to get into sam on systems prior to 11.23.

One 11.23 systems, the details are available from the command line:

# kctune -v maxdsiz_64bit
Tunable maxdsiz_64bit
Description Maximum size of the data segment of a 64-bit process (bytes)
Module vm
Current Value 4294967296 [Default]
Value at Next Boot 4294967296 [Default]
Value at Last Boot 4294967296
Default Value 4294967296
Constraints maxdsiz_64bit >= 262144
maxdsiz_64bit <= 4396972765184
Can Change Immediately or at Next Boot

With 11.23, you use kctune to update the parameters. A simple reboot, if necessary, will update the static parameters.

11.11 and previous OS versions require a bit more work. As stated, sam is a valid way. I still prefer the command line though. The checklist I use to update kernel parms is available at:

http://www.olearycomputers.com/ll/hpkernel.html

HTH;

Doug