F5:s is the most commonly used in these scenarios, have a look at the "Always On Reference Architecture" from VMware.
http://www.vmware.com/files/pdf/solutions/vmw-alwayson-validated-design-guide.pdf
F5:s is the most commonly used in these scenarios, have a look at the "Always On Reference Architecture" from VMware.
http://www.vmware.com/files/pdf/solutions/vmw-alwayson-validated-design-guide.pdf