We have a big push to do as much consolidation of servers and databases as possible. At the moment, we don't have a huge number (22 servers, 300 databases). Most are SQL 2008 and 2008 R2, a couple of SQL 2012. And we're looking to implement SQL 2014 this year. A couple are physical servers, the others are VM (VMware). The consolidated server(s) will also be VM. When consolidating instances on a single server:How many instances per server? Databases per instance? Not MS theoretical limits but based on practical experience. IIRC, a MS SQL trainer once told me 5 instances per server and 50 databases per instance (but that seems low by today's standards). What are the resources that limit a single server's performance, compared to giving each instance it's own server? (Assuming CPU and memory are practically unlimited, and each instance has separate SAN LUNs for data, logs tempdb, etc). What is the first thing "to hit the wall" on a single server? Would you mix versions of SQL? 2014, 2012, 2008 on the same box? What other considerations are there when consolidating instances and databases? thanks for any suggestions.
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