I have a ESXi 5.0 server with 128GB of Ram and local storage. The server has 13 VM's range from 4GB of Ram to 20GB (Please note 4 of the VM's are using 20GB). Only one VM has a 1GB reservation. I was suprised to see that my VM through a host memory alarm early today and that 90% of my host memory was in use. When I looked at the resource allocations the guest VM's memory usage was very low but the host memory usage on the at least 4 VM's was high.
I have three resource pools in place.
high - no reservation
normal - 900mb
low - 300mb
Is it possible to have to many resource pools which could cause resource problems