How to license Windows Server and SQL Server across hybrid environments. Per core mechanics, Azure Hybrid Benefit, Software Assurance rules, and the audit traps that catch hybrid estates.
Windows Server and SQL Server license per physical core, with a minimum of eight cores per processor and sixteen per server. Count the physical cores, not the virtual machines, on the host.
Microsoft documents the model on its Azure Hybrid Benefit pages, which set out the mobility and core rules.
Count every physical core on the licensed host and apply the minimums. Over counting and under counting both create exposure.
Datacenter licenses unlimited virtualization on the host. Above a handful of virtual machines per host, Datacenter usually wins the math.
Azure Hybrid Benefit lets you apply existing licenses with Software Assurance to Azure workloads, removing the license charge from the compute rate. On eligible estates it is the largest single saving.
Hybrid licensing levers
| Lever | What it does | Condition |
|---|---|---|
| Azure Hybrid Benefit | Removes license from compute | Software Assurance active |
| License mobility | Moves licenses to cloud | Software Assurance active |
| Edition right sizing | Matches edition to use | Virtual machine density |
Software Assurance carries the mobility and Hybrid Benefit rights the hybrid estate depends on. Let it lapse and you lose the rights that make the model work.
SQL Server licenses per core with its own Hybrid Benefit and high availability rules. Model SQL separately from Windows Server to avoid double counting.
Microsoft audits target core counts, virtualization rights, and lapsed Software Assurance. A clean inventory is the best defense.
The hybrid estates that pass an audit clean are the ones where the buyer documented the core inventory and the Software Assurance coverage before the auditor asked.
Count the cores, claim the benefit, then protect the rights.
Morten Andersen wrote this from the Microsoft server licensing reviews he has run. He will walk your hybrid estate and your three biggest levers in a 30 minute call. No pitch.
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