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How do I calculate the number of licenses I need for a server?
The number of licenses you will need depends on the number of physical processors there are on the server, and the number of instances that you will be running (this only applies to Standard Edition, since Datacenter Edition allows for unlimited VMs).
Determining the number of physical processor licenses
Each license covers one physical processor, so you must count the number of physical processors on the server.
Here are some examples:
* You have a 2-processor server. You will need two licenses to cover a 2-processor server.
* You have a 4-processor server. You will need four licenses to cover a 4-processor server.
Determining the number of virtual instances running
If you want to run additional VMs and you do not require the highly virtualized environment that Datacenter provides (which has unlimited VMs), then you can purchase additional Standard Edition licenses for each processor and assign them all to a single physical server to increase your VM entitlement on that server.
For example, for Standard Edition, if you assign two Standard Edition licenses to a 2-processor server, you will be able to run 1 VM on that server. If you add 2 additional Standard Edition licenses to that server, the number of allowed VMs on that particular server will increase by one.
Here are some examples:
* You have a 2-processor server with 4 VMs. You will need eight licenses for 4 VMs on a 2-processor server.
* You have a 2-processor server with 6 VMs. You will need twelve licenses for 6 VMs on a 2-processor server.