Availability Zones

Source: https://www.youtube.com/watch?v=h0enGb17lnw&list=PLlVtbbG169nED0_vMEniWBQjSoxTsBYS3&index=9

For a data center you need:

1) Independent Power

2) Independent Cooling

3) Independent Networking

Availability Zones help with a facility level failure

• Not every region support availability zones, but most do

• Usually there are 3 availability zones to pick from

  • 1,2, and 3 does not necessarily indicate building #1, building #2, etc, but it does guarantee different buildings

• A subscription is a billing boundary as well as a resource boundary

  • For each subscription you will see AZ1, AZ2, AZ3

    • These zones may be unique to this subscription

      • i.e. The data center might have 20 physical buildings and your AZs may map to separate buildings than other subscriptions

• Similar to regions, microsoft will roll out updates to one AZ at a time

• Zonal is when something goes to a specific AZ (i.e. a VM)

• Zone redundant when it spans across the AZs

  • Sometimes you can choose this and other times it is forced