Currently we are using vcenter 5.1. can we upgrade 5.5 on it. Remember my vc is on physical server. if yes please mention the stapes.
Pls have a check on the follow KB's
Methods of upgrading to vCenter Server 5.5 (2053130)
Upgrading to vCenter Server 5.5 on a Microsoft Windows platform using the Simple Install method
Upgrading vCenter Server 5.5 on a Microsoft Windows platform (2058275)
Also check Update sequence for vSphere 5.5 and its compatible VMware products
Yes we just upgraded our 5.1 vCenter to 5.5. Our vCenter server resides on a physical Windows box.
We used the "simple" method.
Hope this helps.