We have 2 set of ESX 3.5 host, vCenter running in VM (not physical computer). The stroage is SAN storage (EMC). The guest OS are around 10 set. And that is file server, AD server, Print server... etc.
We are planing to purchase 2 set of Dell-PowerEdge R720 (32GB Ram) as new host. And also upgrade the VM to ESXi5.1, and will use 1 of old host as vCenter. Could you please provide the best practise step for upgrade the hardware and software. Many thanks.