Multiple server deployment is a supported configuration. Naturally.
2013 to 2016 must first go via 2015. Understood.
Question is, in multiple-server deployments when following in-place upgrade approach (I know, not my recommendation either), must every server in the deployment be upgraded to 2015 first or just the server carrying the Deployment Server role?
Our topology is:
1 x Deployment Server role
2 x Web front end
3 x back end
1 x SSRS
1 x SQL Server (primary node, AlwaysOn cluster to other 3 SQL Server nodes)
all x 2: one topology at primary site and one at DR.
Appreciate the wisdom from those that have gone through it.
Many thanks