There are many supportive refrences with DSS V7 as a VM. These videos will show you more on what you need.

http://www.open-e.com/service-and-su...-to-resources/

http://www.open-e.com/service-and-su...ts-and-videos/

Open-E DSS V7 as a Virtual Machine - Best Practices
Active-Passive and Active-Active HA Cluster Comparison with Performance Benchmark
How to install Open-E DSS V7 as virtual machine on VMware
HA Solution with VMware and Open-E DSS V7 as Virtual Storage Appliance