How to upgrade VMware Infrastructure 5.x to 6.0
I found a good article to upgrade vmware 5.0 to 6.0 infrastructure they have give steps as below .VMware vSphere 6.0 upgrade is performed in a phase manner.
Phase 1: Perform the upgrade of the VMware vCenter Server along with VMware vCenter Update Manager.
http://www.youtube.com/watch?v=efViGyzYY3Y
http://www.youtube.com/watch?v=QXOkUVhIOA8
Phase 2: Upgrade your vSphere hosts to vSphere 6.0
Phase 3: Complete the upgrade of your virtual machines by first upgrading VMware Tools, then optionally upgrading the virtual hardware.
Phase 4: The final step is to upgrade your datastores to VMware vSphere VMFS version 5
the whole article is available on vmware site with video tutorials.
Source Article :- http://www.vmware.com/products/vsphere/upgrade-center/upgrade