I've had my first CentOS 7 KVM host setup for about a year now, it is a dual quad-core machine with 32GB of physical memory. I have a dozen VM's running with a total allocated memory of 23GB. This system has 4GB of swap and here is the current usage details....
KiB Mem: 32773552 total, 32564628 used, 208924 free, 2224 buffers
KiB Swap: 4603836 total, 3262108 used, 1341728 free. 9606248 cached Mem
I've read you really don't want a great deal of swap because if it shouldn't be using swap at all. I believe the above shows over 3GB being used now, is this normal? I am not having any performance issues out of this server. I am currently building a new server and comparing to see what is the best amount of swap to use on the new server that should have similar loads?