topic default kernal parameters in Operating System - HP-UX

default kernal parameters

Erik Voelker_1 — Tue, 10 Apr 2001 16:27:50 GMT

I've been given responsibility over some older HP 9000 k100's and k380's running one Oracle instance per machine. I know the kernal parms have been tuned, is there anyway I can find the original (default) kernal parm settings?

Thanks,
Erik

Re: default kernal parameters

James R. Ferguson — Tue, 10 Apr 2001 16:44:27 GMT

Hi Erik:

SAM has default templates. You can look in /usr/sam/lib/kc/tuned/ .

You can also use 'sysdef' in 10.20 and 'kmtune' in 11.x to list kernel parameters along with their ranges and defaults (see the man pages for further details).

Take a look too, at /stand/system. This will contain those parameters tuned from the default values (either individually, or due to the application of a template).

...JRF...

Re: default kernal parameters

Patrick Wallek — Tue, 10 Apr 2001 16:49:18 GMT

Here are kernel documentation sites. If you click on a kernel parm, it will bring up more info. and list the max, min and default values.

11.0 (and 10.20, I think)
http://docs.hp.com/hpux/onlinedocs/os/KCparams.OverviewAll.html

11i (11.11)
http://docs.hp.com//hpux/onlinedocs/os/11i/kcparams/KCparams.OverviewAll.html

Re: default kernal parameters

Erik Voelker_1 — Wed, 11 Apr 2001 14:39:52 GMT

The k100's are running on one 100mhz processor with 128mb of ram, do you think the following parameter values are too high?

msgmap (2+MSGTQL)
msgmax 32768
msgmnb 65535
msgseg 11728
msgssz 32
msgtql 6856
ninode 1400
semmap 2194
semmni 2192
semmns 2384
shmmni 2312

Thanks again,
Erik

Re: default kernal parameters

Joseph C. Denman — Wed, 11 Apr 2001 17:29:49 GMT

If the system is running fine, I would not mess with them, especially if a production environment.

However, if you are attempting to tweek you boxes, I suggest doing research on the parm you entend on modifing. Then making mods to only one at a time.

Make a mod
boot the system
Wait a while.
see if it made a difference
repeat

If you make too many changes at once, you really don't know what affected what!!!

Have a good ignite backup prior to any mod to the kernal.

Hope this helps.

...jcd...