Yesterday I just did a migration of vCenter server from Physical to virtual. I re-install and configured the vCenter on the virtual machine and manually registered all the ESX host to the new vCenter. 1 of the challenges I faced was the DVswitch. I had created the same DVswitch name and port group in the new vCenter. Guess what, during the migration, the virtual machines network disconnected. I tried to dig around whats went wrong, as I found there was case senstive on the dvswitch. The case senstivie applied and happened on the Hypervisor level but from the vCenter perspective, it may not be the case as Windows does not has the issue with case sensitive. I try to create a new DVswitch port group with the correct case sentitive as I did on the hypervisor previously, vCenter detected as duplicate portgroup name.

At the end, I need to manually point the virtual machine 1 by 1 to the new port group I just created and of course there are some packet drop when this been performed. From this, I will suggest if anyone try to create a new dvswitch on different vcenter for migration purpose, try to keep the upper and lower case to be exactly same.