We're currently on Active Roles version 8.1.3 in a single datacenter with multiple web servers and always on SQL DB. We're looking to re-architect to a dual datacenter model (keeping our current datacenter as-is). Question is how to stand up the new servers in the 2 new datacenters and migrate. The latencies are 8-10 ms.
Our current plan is to attach our new servers in the new datacenters to the existing DB in the existing datacenter, then migrate the DB when we go-live. One question is application versions. Can we install 8.1.5 on the new servers? Or should we stick with 8.1.3 and upgrade later?