I'm building VMs for an application that will have 3 separate server environments; dev/test/prod. Dev will only need 1 app/web server and 1 DB server but test/prod will each need to be highly available with 2 app/web servers and 2 DB servers (SQL Server 2014).
Would it make the most sense to just have 2 MS SQL Server Enterprise 2014 servers in an Always on Availability Group with 3 separate instances for dev/test/prod? Is that good practice or is it better for each environment to have their own DB servers? If all 3 environments shared DB servers then I would only need 2, but if they each have their own DB servers then I would need 5.
