The IFS statement on supporting virtualized servers.

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Virtualization Software
If running IFS Applications on virtualization software (VMWare, XEN, Hyper-W  etc.) customers should be aware that IFS certification of various platforms is  done on physical servers only. When running components of IFS Applications on  virtual servers support is provided in the following manner.
If a problem arises and it is a known IFS Applications issue, IFS will recommend  an appropriate solution.
If that solution does not work, the customer must  contact the VM software Vendor's support for further help.
If the problem is  determined to be an unknown IFS Applications issue when running on a VM, the issue must be reproduced on a physical system by the  customer or VM vendor support before IFS will try and solve the problem.
All issues which  are determined to be VM specific will be referred back to the customer, who  should contact VM vendor support.
In addition all policies for Virtualization stated by Oracle also Apply for  the IFS Application database.
Oracle generally do not support nor recommend the  Oracle RDBMS database server to be virtualized in a production environment.
See for example Oracles VMware policy statement (Note:249212.1:  Support Status for VMware)