What is platformUpdateDomainCount property in Azure Availability Set good for?

Experience Level: Junior
Tags: Azure Availability SetsAzure CloudAzure Virtual Machine Scale Sets

Answer

The platformUpdateDomainCount is a property that defines how many update domains there are in the availability set. The upper limit is 20.

If the platformUpdateDomainCount is set to 3 and you have 15 virtual machines in the availability set, it means that 5 VMs can be updated and unavailable at a time, but the remaining 10 VMs are always available.
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