On Thu, Feb 03, 2011 at 05:58:19AM +0800, mcclnx mcc wrote:
> We have DELL R900 server with 128GB RAM (CENTOS 5.5)in it. This server only have one application running and few people use it.
>
> Every week I ata least get one or two messages from monitor tool mail to me say:
>
> Message=Memory Utilization is 92.02%, crossed warning (80) or critical (90) threshold.
It sounds like your monitor tool is probably misconfigured and is looking
at "free memory", which is a very low value 'cos unused memory is used as
disk cache.
eg
% free -m
total used free shared buffers cached
Mem: 3987 3551 435 0 330 2987
-/+ buffers/cache: 233 3753
Swap: 2047 0 2047
This machine has 435M free, out of almost 4G. Except not really; it's got
3753M available for programs to use and is only using 233M of memory for
"real" stuff!
--
rgds
Stephen