A common problem I see is when VMotion fails at the 10% mark with a timeout. You might see a dialog popup which says- Operation timed out Tasks: A general system error occurred: Failed waiting for data. Error 16. Invalid argument The VMware Knowledgebase writers have assembled a great list of possible reasons for this [...]

Ok, here is the KB article discussing the problem where the CPU usage of a virtual machine might increase significantly after VMotion migrates the virtual machine in a cluster with DRS enabled. As a result, the performance of the virtual machine might be degraded. “Starting with ESX Server 3.5 and VirtualCenter 2.5, DRS applies a [...]

Here is a quick fix for those experiencing a problem using VMotion after upgrading from ESX Server 2.5 to ESX Server 3.5 In some cases after this upgrade is done VMotion is disabled and warm migrations are not possible. The solution is to re-enable VMotion on the host. Re-enable VMotion on the host: Select the [...]