topic Re: Kernel Tunable. in Operating System - HP-UX

Kernel Tunable.

brian_31 — Thu, 15 Nov 2001 18:24:47 GMT

Hi Team:

We have a whole lot of kernel tunable for 11.0 for a third party vendor. It almost covers every Kernel tunable for 11.0. Is there an order to start as each of them is interdependent? Please help me as to how to proceed with this like which one to set first and the next so on..

Thanks &Regards
Brian.

Re: Kernel Tunable.

Paula J Frazer-Campbell — Thu, 15 Nov 2001 18:30:36 GMT

Hi
If you are tuning a new system then tune via sam as each interdependance will be shown.

Paula

Re: Kernel Tunable.

James R. Ferguson — Thu, 15 Nov 2001 18:32:37 GMT

Brian:

Have a look at the document (via the link), below). It is organized by related parameters.

http://docs.hp.com/hpux/onlinedocs/os/KCparams.OverviewAll.html

Regards!

...JRF...

Re: Kernel Tunable.

Michael Tully — Thu, 15 Nov 2001 22:54:28 GMT

Hi,

As already suggested by Paula, SAM would
be a good place to start if you don't
know. Are the suggested parameters listing
numbers only or a combination of numbers
and formulas? If it is the latter, you
could use the below suggested method.

as root

# cd /stand/build
# /usr/lbin/sysadm/system_prep -s system
# vi system (make your changes)
save file

# /usr/sbin/mk_kernel -s system
# /usr/sbin/kmupdate

# cd /
# /sbin/shutdown -r -y 0

HTH
-Michael

Re: Kernel Tunable.

A. Clay Stephenson — Thu, 15 Nov 2001 22:58:58 GMT

Hi Brian:

I would take the 3rd party's tunable list with a grain of salt. I've seen quite of few of those. Some are simply funny; some are truly dangerous; a few are valid. Ask lots of questions and if you don't get reasonable answers without hand-waving then examine them very carefully. In short, look before you leap.

Regards, Clay

Re: Kernel Tunable.

Michael Tully — Thu, 15 Nov 2001 23:20:42 GMT

Clay, very good comment concerning vendor
related suggestions on kernel parameters.
We received a suggested list of these
from one vendor shush! (peoplesoft) and
some of them were laughable.

maxfiles 4096 (double the nominated limit)

-Michael

Re: Kernel Tunable.

Roger Baptiste — Thu, 15 Nov 2001 23:44:55 GMT

Brian,

Start off with a pinch of cynicism on the given list. Ultimately it is you who call the shots on what the parm values should be. I have seen params from vendors which are way off mark.

Next, before you do any change, take a printout of your existing kernel parm values. use SAM since for every value you attemptto change it calculates dependencies and warns you about it. Do this for the whole list provided by the vendor. A good starting point would be to tweak MAXUSERS values, since that in turn controls nfiles , nflock and few other values.

HTH
raj