Fault Domain Availability Set

To change the fault domain count you.

Fault domain availability set. What are fault domains. Regions availability zones and fault domains. Fault domain means common power source and common physical network switch for vm s.

Maximum 2 or 3 fault domain fd provided by azure for each availability set based on azure region. When you put vms on an availability set then to protect vms from failure azure spread them on fault domain and update domain. Please refer microsoft article for common errors messages.

When you place your vms in an a vailability set azure guarantees to spread them across fault and update domains. Azure fault domains define the group of virtual machines that share a common power source and network switch. All hosts in the presentation tiers and middle tiers belong to fault domain 1.

By default azure will assign three fault domains and five update domains which can be increased to a maximum of 20 to the availability set. There are 3 fault domains and 5 update domains per availability set by default. A rack goes down it is the pcs that are lost.

It just means that machines are being protected from. Once underlying host physical server 1 and vm nsit vm01 are back azure will pick another update domain. You can change the number of fault and update domains in an availability set.

A fault domain is factually a rack of the servers which consumes mostly subsystem like network power cooling etc. Microsoft azure what is an availability set. Each and every fault domain contains some racks and each rack contains a virtual machine.