"The Memory Control Driver for virtual machine <VM name> will not deflate. The VM is unable to reclaim memory that is allocated to it. Add more physical resources to the server or use VMotion to move the VM to better balance utilization across servers in the cluster."

"The Memory Control Driver for server <host server> is not able to deflate the balloon for its virtual machines. Add more physical memory to the server or use VMotion to better balance utilization across servers in cluster. This rule checks for servers working really hard to reclaim memory. Add more physical resources to the server or use VMotion to better balance utilization across servers in the cluster."

"VM has moved virtual machine memory from physical pages to the VMWare swap file within ESX. This may adversely affect performance on this VM."

Virtual Center's performance graphs show that the ESX server(s) in question are in fact using between 100-150 MBs of swap memory, and vFoglight does show that the VM(s) in question are using between 50 and 100 MBs of swap memory. This is dispite the fact that the ESX servers are only using between 25 and 40 % of their RAM.

Balooning seems to be at zero everywhere.

Any ideas?