You have 9 virtual machines in an Availability Set with 2 fault domains and 20 update domains. How many VMs will remain available during planned maintenance?

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Thamimul ansari · Accepted Answer

During planned maintenance, at least 8 VMs will remain available because only one update domain is updated at a time. With 9 VMs distributed across 2 fault domains and 20 update domains, each update domain will have at most $9\div 2=4.5$ VMs. However, because update domains are updated one by one, and VMs are spread across them, you will still have 8 VMs available

You have 9 virtual machines in an Availability Set with 2 fault domains and 20 update domains. How many VMs will remain available during planned maintenance?

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