VMware has put a stake in the ground with respect to Oracle licensing of VMware VMs running Oracle. The gist of this statement regarding certification, support, and licensing is that DRS host affinity rules, combined with vCenter audit trails showing where VMs have actually run, are sufficient for Oracle licensing purposes. The summary of the document states:
DRS Host Affinity rules can be used to run Oracle on a subset of the hosts within a cluster. In many cases, customers can use vSphere to achieve substantial licensing savings.
vCenter VMotion Logging
Concerning vCenter VMotion logging, the (more...)