VMware released a free e-book today on tips for performance on vSphere 5.1! Â The VMware blog post outlining the topics is here:Â http://blogs.vmware.com/performance/2012/09/performance-best-practices-for-vmware-vsphere-5-1.html.
http://www.vmware.com/pdf/Perf_Best_Practices_vSphere5.1.pdf