topic Re: Kernel Parameters / Swap in Operating System - HP-UX

Kernel Parameters / Swap

Art Taylor — Tue, 19 Jul 2005 05:28:33 GMT

Hello everyone.
I will be installing 8GB of ram and 1 additional CPU into an HP K460 running 11.0. This will then be a 4 processor server.

Currently is a 3 CPU with 4GB of ram and 4GB swap configured.

Please advise as to what other kernel changes would likely be necessary to accommodate the addtional ram.

I intend to use pseudo-swap and configured 8GB of swap.

Thanks to all.
Art Taylor

Re: Kernel Parameters / Swap

Leif Halvarsson_2 — Tue, 19 Jul 2005 05:35:30 GMT

Hi,
Most kernel parameters is more application (software) dependant then hardware dependant. Check for recommendations in the inatallation manuals for the software you plan to install.

Re: Kernel Parameters / Swap

Pete Randall — Tue, 19 Jul 2005 05:39:55 GMT

The only one that comes to mind is maxswapchunks.

Pete

Re: Kernel Parameters / Swap

RAC_1 — Tue, 19 Jul 2005 05:40:30 GMT

It would be btter if you add addiotnal swap space (4gb of it) on seperate disk than the primary swap. And set priority to same as that of primary swap.

You may have to tune maxswapcunks paramter to match the total swap space.

Anil

Re: Kernel Parameters / Swap

Art Taylor — Tue, 19 Jul 2005 06:09:10 GMT

Leif - I would like to use your suggestion for the application I am running, but unfortunately I have a 14 year old application that has to run on old outdated hardware and no manuals at all.

Pete - I will look at the maxswapchunks

Anil - I was contemplating doubling my swap after I post the original request. I will modify the maxswapchunks as well.

My thanks to all of you for your input and quick response to my post.

Have a great day !!

Re: Kernel Parameters / Swap

Art Taylor — Tue, 19 Jul 2005 06:13:58 GMT

Just a follow up.

Leif, Pete, Anil - did you all get your points I posted?

Thanks again.
Art

Re: Kernel Parameters / Swap

Geoff Wild — Tue, 19 Jul 2005 06:17:01 GMT

Also modify dbc_max_pct - so it is between say 400 and 800 MB of ram.

So, for 8 gb - set it to say 9 or 8.

Rgds...Geoff

Re: Kernel Parameters / Swap

Art Taylor — Tue, 19 Jul 2005 06:31:20 GMT

Geoff - I will adjust that parameter as well.

Thank you.
Art

Re: Kernel Parameters / Swap

Art Taylor — Wed, 20 Jul 2005 05:20:57 GMT

All the recommendations will be utilized where possible when hardware upgrade is completed.