topic Re: Memory increase in Operating System - HP-UX

Memory increase

Scott G. Gallup — Wed, 11 Nov 2009 13:48:10 GMT

I have an rp4440 running HP-UX 11.11. The server currently has 8GB of memory and I am going to increase the amount by another 8GB. I know I will be modifying the value of shmmax.
I was wondering if anyone has any suggestions, warnings, etc. about any other kernel parameters that should be changed or monitored. I am not expecting any specific values/setting just general advice and/or experiences. Thank you.

Re: Memory increase

TTr — Wed, 11 Nov 2009 14:00:10 GMT

You need to check the current utilization of some more kernel structures, anything that has a max limit, such as messages, semaphores, nproc, open files, file locks etc. and increase them if needed.

Also check your swap space utilization. You may need to add more disk swapping to be able to utilize all of the installed memory.

Re: Memory increase

Johnson Punniyalingam — Wed, 11 Nov 2009 14:59:43 GMT

I would prefer to do

Ignite backup of the Server

increase swap space

Upgrade the "Memmory"

Once mememory upgrade "Perfrom Diagnostic" test for memory -> via stm

Re: Memory increase

Jacques Carriere — Mon, 16 Nov 2009 19:03:54 GMT

Don't forget to adjust dbc_max_pct and dbc_min_pct.

Re: Memory increase

Aneesh Mohan — Mon, 16 Nov 2009 19:11:47 GMT

Hi,

The parameters that effect memeory are :

bufpages
dbc_max
dbc_min
desfree
lotsfree
maxdsiz
maxssiz
maxtsiz
minfree
msgmax.msgmnb
nbuf
nclist
netmemmax
nfile
ninode
nproc
page_text_to_local
strmsgsz
swapmem_on
unloackable_mem

Aneesh

Re: Memory increase

Suraj K Sankari — Mon, 16 Nov 2009 19:23:19 GMT

Hi,

After upgrading memory you need to extend your SWAP memory and you need to monitor your server. according to your utilization or as per applications demand you need to change the kernel parameters.

Suraj

Re: Memory increase

Scott G. Gallup — Wed, 18 Nov 2009 13:10:32 GMT

Thank you to all who replied