I have a relatively large VMware ESXi 4 environment (~300 VMs running on ~50 hosts, some standalone, some clustered) that I need to upgrade to ESXi 5. The vCenter Server is already at v5.0.0, so ...

I think I have this covered from the VMware Communities, however always worth a set of second opinions. Tomorrow we're taking down our 2 box/SAN ESX 3.5 cluster to install some additional RAM. Whilst ...