system hung Phy mem utilization 100% & swap utilization 0%

[Prasanth V Aravind]

We are facing memory problem on I64 hp server. It has 18GB RAM and 24 GB swap. System is not at all using swap space even though physical Memory get 100 % utilized. Once Phy mem is 100 % starting to give “swap reservation failure error “and system get hung.

Can we specify/ define some where as system should be use swap space, before physical RAM utilization is 100%.

System specification:-
HPUX11.23
Rx4640
18 GB MEM
24GB swap


Thanks in advance
Prasanth

[AwadheshPandey]

http://docs.hp.com/en/5187-4198/ch02s09.html
http://h21007.www2.hp.com/portal/download/files/unprot/devresource/Docs/TechPapers/UXPerfCookBook.pdf

[whiteknight]

Prasu,

Usually the standard rules of swapspace is 2x of physical memory = 36GB.

Check your kernel parameter dbc_max_pct value also make sure set < than 10%
hope this help

WK

please assign points

[Dennis Handly]

>Can we specify/define some where as system should use swap space, before physical RAM utilization is 100%.

Using 100% of RAM is a GOOD thing.
Please provide your "swapinfo -tam" output so we can analyze it.

>swap reservation failure error

Then you need even more swapspace.

>WK: Check your kernel parameter dbc_max_pct value also make sure set < than 10%

This should be automatically reduced if under memory pressure?