topic add memory, need to modify kernel params? in Operating System - HP-UX

add memory, need to modify kernel params?

John Kittel — Tue, 18 Apr 2006 17:03:15 GMT

HP-UX 11i. rp7410 ( two of them actually).

I am adding memory to increase from 10GB to 16GB.

I plan to adjust kernel params dbc_max_pct and dbc_min_pct to maintain my current 800MB size buffer cache. I know how to do that.

Are there other kernel params that may need to be adjusted? One system runs oracle, if that matters.

- JOhn

Re: add memory, need to modify kernel params?

Christopher Caldwell — Tue, 18 Apr 2006 17:12:14 GMT

In general, you shouldn't need to modify any other kernel parameters.

Re: add memory, need to modify kernel params?

James R. Ferguson — Tue, 18 Apr 2006 17:14:56 GMT

Hi John:

In lieu of using a dynamic buffer cache you could use a static one to avoid this in the future.

If your performance is good, and you have not encountered any fence limits (e.g. in the data stack size ('maxdsiz*', etc), then there is nothing the must be adjusted simply because you have added more physical memory.

Regards!

...JRF...

Re: add memory, need to modify kernel params?

John Kittel — Tue, 18 Apr 2006 17:22:59 GMT

Thanks.