Nagios Support Forum

Please see http://support.nagios.com/forum/viewtop ... 16&t=23044 for background info on this issue.

I am having this issue again - it never actually went away, just getting around to creating a new topic about it.

Doing a helps temporarily.

CentOS release 6.4 (Final) x64
Nagios XI 2012R2.5

I don't think this is a nagios issue - it is more of a "linux issue". Linux uses lots of cached memory, which many people claim *shouldn't be a problem*. You can probably search for ways for optimizing your memory usage and reducing the cached memory on your system.

Note: This exact issue prompted us to modify the "custom_check_mem":
http://support.nagios.com/wiki/index.ph ... ree_Memory