SLA for availabilty zones & sets RRS feed

  • Question

  • Hi,

    i'm studing for AZ-900 certification. I have a question regarding availability zones (AZ) and sets (AS).

    MS says that, if I deploy two instances of a VM (vm1 and vm2) on different AZs or in a AS, then i get a SLA of 99,99%/99,95% respectively.

    I'm confused. What is the difference between build my own application on vm1, ignoring vm2, and buy only an instance? Shouldn't the probabilities of a down be the same?

    Thank you for the answers.

    Tuesday, February 18, 2020 8:50 AM


  • Hi

    If you deploy your app in a a single VM, Then if the VM goes down for upgrades or hardware failure or any disaster, Then you app also will go down.

    Do for the SLA for a single VM will be low when compared to availability sets.

    You application should also be compatible for deploying multiple replicas of them in different vms.

    Once we place 2 or more vms in a availability set, Then the chance of two vms going down at the same time is very very low.   So the SLA also increases.

    Let me know if you have more questions


    Tuesday, February 18, 2020 9:00 AM