VMware Requirements for VMotion

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http://serverfault.com – We have had some issues with our Linux guests, especially CentOS 5 and 6, on our VMware ESXi 4.1 cluster during times of vmotion events. For example, after a vmotion migration, our CentOS hosts appear to be powered on, but you cannot access them or interact with them inside of the console in VCenter. I was curious what the requirements are for the guest VM configuration in order to make this successful. Does one need to have VMware Tools installed for all of the Linux guests to allow vmotion to work? We have VMware tools installed on all of our Windows guests and none of our Linux guests righ (HowTos)