I have two GW12 servers, one with the primary domain and po the other has a secondary domain and gwia and dva (Windows 2008R2). Can I have both servers agents down when I upgrade the primary domain/post office to GW2014 and then upgrade the secondary right after that, or does the secondary need to have the agents running while the primary/po gets upgraded. The reason I'm asking is that these are VM's and I wanted to snapshot each server with the agents down and then do the upgrade (that way I would have a good backout incase of any issues). Is this feasible?