Some time ago I opened ticket with TAC about swap memory usaged on CUCM 6.1. Below you can read full answer (just to mention I had no real problem with CM only was courius why it's happening):
I don't see any real problem however... It's true from the graphs you
showed that the swap memory usage is increasing but this is perfectly
normal on a linux system. My question would be : do you see any issues
with the callmanager or is it just a question of why the swap memory is
increasing?
If it's the latter, that's the way linux memory management works. An
application (like ccm, Tomcat, ...) is asking memory from the OS and the
OS will allocate some pages for this application. If, after a while, the
OS sees that this application is not actively using part of this
allocated memory it will swap this part of memory to disk (swap memory)
so it can free part of the real memory.
On a CallManager this is happening so the real memory can be used to
store the configuration (which is normally on disk) for faster usage.
I can see also from the 'show status' command that you sent that the
memory usage of your CallManager is fine : you have 2Gb installed, more
or less 1.2Gb is in use and around 800Mb is available. This looks very
healthy, nothing to worry about.
So, the fact that you see the swap memory increasing is nothing bad,
it's just normal operation of the linux memory management.
Please let me know if you have any further questions regarding this.
