Difference between fault Domain and Update Domain.

Fault Domains –   refers to rack of servers with subsystems like network, power, cooling etc.  VMs in the same availability set means Azure will provision them in  2 different racks. The maximum value of fault domain is 2.


Update Domain – refers a logical unit of a deployment. Whenever any update needs to be applied at the host level, the VMs in same update domain would be restarted in the order to avoid impact to services and applications.



Author: MStechJi

IT professional with 8.5 years of experience in providing Remote Infrastructure Support in Windows Server environment including MS Azure. Intent to increase my knowledge and experience and share some tips and tricks I’ve learnt along the way.

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