topic Re: Kernel Params not showing up in Operating System - HP-UX

Kernel Params not showing up

Janet Sanberg — Tue, 10 Apr 2007 13:14:24 GMT

I have an rp7640 running HPUX 11.23 on which 2 kernel params - maxsawpchukns and semmap - are not showing in kctune or SAM at all. Maxswapchunks showing up in sysdef as 0 value, semmap not showing there ewither. Also, when DBA tries to upgrade Oracle they get:

Checking for maxswapchunks=16384; found no entry. Failed <<<<
Checking for semmap=4098; found no entry. Failed <<<<

Re: Kernel Params not showing up

Court Campbell — Tue, 10 Apr 2007 13:19:51 GMT

They don't exist in 11.23. Welcome to the world of the oracle installer for hp-ux. It blows.

Re: Kernel Params not showing up

Janet Sanberg — Tue, 10 Apr 2007 13:24:55 GMT

Ok, first I need to correct myself. machine is an rx7640, not rp7640. Also, I am runnning 11.23 on an rx4640 and the kernel params do exist there. What is the difference?

Re: Kernel Params not showing up

James R. Ferguson — Tue, 10 Apr 2007 13:27:51 GMT

Hi Janet:

The old 'sysdef' is deprecated and should not be used. For 11.23 use 'kctune' to query kernel parameters.

As noted, 'maxswapchunks' and 'semmap' don't exist at 11.23.

Regards!

...JRF...

Re: Kernel Params not showing up

Janet Sanberg — Tue, 10 Apr 2007 13:31:15 GMT

Ok, I really do beleive you guys, but how do I explain to the DBA why they are showing up on one system with 11.23 and not this one?

Re: Kernel Params not showing up

Court Campbell — Tue, 10 Apr 2007 13:32:19 GMT

Just so you can feel assured. look here:

http://database.in2p3.fr/doc/oracle/Oracle_Entreprise_Manager_10g_R3/doc/install.102/b28745/EMQHP.htm

then look at the lines that state:

Notes:

The following parameters are obsolete in HP-UX 11.23:
o maxswapchunks
o semmap

Re: Kernel Params not showing up

Court Campbell — Tue, 10 Apr 2007 13:35:18 GMT

Tell your dba's I said the oracle installer for hpux blows big chunks. did you by chance do an upgrade on the other box to 11.23? I am not sure what the oracle installer uses to query the kernel a parameters. but my best guess would be that it looks at some file and you just so happened to have the parameters in that file. But I can only guess.

Re: Kernel Params not showing up

Court Campbell — Tue, 10 Apr 2007 13:40:21 GMT

maybe this is a better answer. maybe someone used kctune with the -u switch to create a user-defined tunable for the two parameters. That seems to be the most plausible explanation.

Re: Kernel Params not showing up

A. Clay Stephenson — Tue, 10 Apr 2007 13:40:51 GMT

You are allowed to "outbushwhack" the kctune command by making up variables using the -u option. Man kctune for details. Here is a sample:
kctune -u -C "Bogus maxswapchunks" maxswapchunks=8192

Re: Kernel Params not showing up

Janet Sanberg — Tue, 10 Apr 2007 14:22:44 GMT

Thank you all for the good information. I think we are all satisifed here.

Re: Kernel Params not showing up

Court Campbell — Tue, 10 Apr 2007 14:27:21 GMT

Thanks for the points. Oh, that's right, you did not assign any.

Re: Kernel Params not showing up

Janet Sanberg — Tue, 10 Apr 2007 14:35:22 GMT

Ok, I mistakenly closed a the thread before submitting my point. Bad me. Hope you like them.