You will find the note about virtualization in each Server Sizing Guide in the Oracle Hospitality Simphony Online Documentation Library of the relevant Simphony version
at Oracle´s Food and Beverage Documentation section now:
A Note on Virtualization
All recommendations put forth herein regarding the resource requirements for hardware when sizing a
Simphony platform are applicable to Virtualized environments as well as physical ones when current
Virtualization technologies such as Oracle Virtualbox are used. Current technologies incur no real overhead cost,
and therefore do not require separate consideration when choosing resource requirements.
and the Virtualization Matrix Supported Virtualization and Partitioning Technologies for Oracle Database and RAC Product Releases
Unix, Linux, & Windows Operating Systems in the Oracle Technology Network.