During planned maintenance, VMs in the same one of these groups reboot together, and only one group is rebooted at a time. Availability sets default to 5 and allow up to 20.
Also called UD.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains Update domain in context, with comparison tables and the common traps.
Terms in this definition
- Planned maintenance
Updates Microsoft schedules for the Azure platform. Most leave VMs untouched; where a reboot is needed, Service Health gives notice and a period during which you can trigger the maintenance on your own timetable.
- Virtual machines
Infrastructure-as-a-service compute giving complete control of the operating system, making it a fit for lift-and-shift moves and for software relying on OS-level pieces like COM.