I'm interested in hearing opinions on this.
I have 3 different geographical sites with datacenters in them, each with at least one Domain Controller. I also have 3 remote locations, which do not have any servers at all, just 3-5 computers each. They are connected through MPLS via a slower (3 MB) connection. The remote locations get Internet access through one of the datacenters for O365 email and hosted SharePoint. Other than that, they contact the datacenters for authentication, minimal shared file services, and updates.
In AD Sites and Services, these are all setup as individual sites (6 sites) with the appropriate subnets associated to their respective site. My question is, what are the pros and cons of this setup? Wouldn't the best configuration be to only have 3 sites (the 3 datacenters) and have the remote sites' subnets be part of one of those 3 sites? Or does it really not matter if there's no AD replication between those remote locations anyhow.