topic required kernel parameters in Operating System - HP-UX

required kernel parameters

IT_2007 — Wed, 09 Aug 2006 08:22:54 GMT

Hi All,

What paramteres do I need to modify after upgrading memory. Here is what I have

1st Vpar on rp8420:
Mem: 8GB will be upgraded to 12GB
Swap: 8GB
maxswapchunks: 2048 - current value
nfile - 15315 - current value

2nd Vpar on rp8420:
Mem: 4GB will be upgraded to 6GB
Swap: 4GB - current
maxswapchunks - 4096 - current
nfile - 15315 - current
maxuprc - 300 - current

Is there any other parameters to be updated?

Thanks,
Srini

Re: required kernel parameters

Jaime Bolanos Rojas. — Wed, 09 Aug 2006 08:46:46 GMT

Srini,

Look at this thread and follow Bill's Advice on how to change that kernel parameter,

http://forums1.itrc.hp.com/service/forums/bizsupport/questionanswer.do?threadId=1040911

Regards,

Jaime.

Re: required kernel parameters

Jaime Bolanos Rojas. — Wed, 09 Aug 2006 08:52:04 GMT

Srini,

Also take a look at this doc:

http://www.peoplesoft-hp.com/tools/whitepapers/%5Bfiles%5D/Technical/HPUX%20Performance%20Cookbook.pdf

Small document a explains it very well some tunable parameters.

Regards,

Jaime.

Re: required kernel parameters

Bill Hassell — Wed, 09 Aug 2006 11:44:44 GMT

The only parameter that is directly related to RAM size is dbc_max_pct. Set dbc_maxz_pct to 10 on vpar-1 and 20 on vpar-2 (DON'T leave it at 50, the bad default value). The rest of the parameters depend on your applications and environment and are not directly related to RAM size. Note that if you are getting "out of memory" or other error messages relating to memory, HP-UX is a virtual memory system so swap space handles programs that exceed RAM. Most of the time, these programs require changes to access more RAM. See also maxdsiz and maxdsiz_64 in case your programs are dozens of megs in size.

Re: required kernel parameters

IT_2007 — Wed, 09 Aug 2006 12:17:01 GMT

Jamie,

Thanks for the cookbook and it is pretty good to decide the parameters.

Thanks,
Srini

Re: required kernel parameters

IT_2007 — Wed, 09 Aug 2006 12:18:18 GMT

cookbook given by Jamie is helpful.