topic Re: buffer issue in Operating System - HP-UX

buffer issue

arun m govind — Wed, 23 Aug 2006 01:34:52 GMT

hi
how can i incres the buffer size in hpu11.11i system

regards
Arun M Govind

Re: buffer issue

Steven E. Protter — Wed, 23 Aug 2006 01:39:57 GMT

Shalom,

dbc_max_pct can be increased.

There are two versions of 11i released today, I beliee its dynamic, ie does not require a reboot in 11i v2.

You may also wish to increase dbc_min_pct

If these two parameters are too far apart the system can lose a lot of resources when it tries to dynamically adjust the buffer cache.

SEP

Re: buffer issue

sajeer_2 — Wed, 23 Aug 2006 01:51:42 GMT

Arun,
See the reply from Bill Hassel in this post

http://forums1.itrc.hp.com/service/forums/bizsupport/questionanswer.do?threadId=829449

sajeer

Re: buffer issue

arun m govind — Wed, 23 Aug 2006 01:51:43 GMT

hi

thanks for the replay

in my system the values are as folows
dbc_max_pct=100
dbc_min_pct=5
max how much i can incree from this

regards
arun m govind

Re: buffer issue

Patrick Wallek — Wed, 23 Aug 2006 02:09:56 GMT

Stop!!!!! You absolutely MUST change your dbc_max_pct parameter. There is absolutely no way you want it to be 100.

That means that, at least in theory, your buffer cache could take up 100% of your RAM, leaving you no room for other things, like critical HP-UX processes to run.

Ideally, with HP-UX 11.11, your buffer cache should be between 800 and 1600 MB.

Please please please reduce your dbc_max_pct as soon as possible.

Now, tell us what your real problem is. Why do you think you need to increase your buffer cache size?

Re: buffer issue

arun m govind — Wed, 23 Aug 2006 02:56:54 GMT

hi

thanks for the replay.

Regards
arun

Re: buffer issue

arun m govind — Wed, 23 Aug 2006 02:58:50 GMT

hi

thanks