There is a plethora of information out there about migration of clustered 08r2 VMs to 2012 VM as is there also a ton of info on upgrading the 2008 R2 host to 2012.
What I cannot find, is in a non-clustered, non-HA scenario, for a small customer running Lync, TMG, and File services off of one host, containing those three VMs, they want all four (the one host and thee guest VMs, all Hyper-V 2008R2 Enterprise) to be 'Upgraded', to 2012.
Can the Hyper-V 2008R2 Enterprise Hosts be safely upgraded one-by-one, within the VM, to 2012 Datacenter or do we have to treat it in theory as a cluster and use migration tools?
Since all three are in production, after redundant backups are made, the goal would be to bring each guest from 09r2 to 2012 up one by one, test overnight, and then test in production before moving into a new cluster...
Thanks!
B