Read about Availability set Overview::
What is an availability set?
An availability set is a logical grouping of VMs that allows Azure to understand how your application is built to provide for redundancy and availability. We recommended that two or more VMs are created within an availability set to provide for a highly available application and to meet the 99.95% Azure SLA. There is no cost for the Availability Set itself, you only pay for each VM instance that you create.
What is the fault domain?
there will be so many servers residing on data centers, all these servers will be placed on racks, each rack will have its own power supply and network switch we can call each rack a fault domain.
fault domain can fail at the same time and the root cause will same.
What is the updated domain?
The updated domain is a group of resources that can be maintained/rebooted at the same time. only one updated domain can be rebooted at a time. there will be 30 mins maintenance time difference between the two updated domains.
SLA for Virtual Machines
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