IT organizations that have implemented Oracle Real Application Clusters (RAC) often use RAC to support critical functions of their business. Performance of these database clusters is key to enabling IT organizations to meet the requirements of their businesses, customers, and shareholders.
VMware vSphere provides a high performance virtualization platform that is capable of hosting the most critical portions of infrastructure, including Oracle RAC databases. vSphere 5 has increased these capabilities, including support for virtual machines with up to 32 vCPUs and 1TB of RAM. This support for larger virtual machines (VMs) combined with vSphere's high performance capabilities makes vSphere a great platform for running large Oracle RAC database clusters.
EMC IT has implemented vSphere throughout many parts of their infrastructure and is now in the process of moving the largest and most critical applications to vSphere. EMC and VMware worked together to evaluate the performance of one of EMC's largest Oracle RAC databases on vSphere 5. A copy of this database was used to conduct a series of tests to compare physical performance versus virtual performance.
This testing, which was done with an Oracle RAC cluster made up of six 32-CPU-based nodes, four of them virtual and two of them physical, found that virtual performed within 12% of native and was acceptable to be used for the production instance. EMC IT plans to adopt this virtual configuration in its next refresh cycle.
http://www.vmware.com/files/pdf/techpaper/OracleRAC-perf-vSphere5.pdf
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