A rack just lost power. The shop kept selling.

Frequently asked questions

What is a fault domain in Azure?

A group of hardware — VMs on the same rack sharing one power feed and one network switch — that fails together. Losing the rack's power or switch takes out everything in that fault domain at once.

Does putting two VMs in an availability set automatically protect them?

Only if Azure actually places them in different fault domains — two VMs that land in the same fault domain share the same failure, so they aren't redundant with each other even though they're both "in" the set.

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