Availability Set conf

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Occasional Contributor

 

If we configure VM's under availability sets, if the Data Center goes down. Will the VM's from my availability sets will be migrated. Just wanted to know the theory. Please suggest me.

3 Replies

@Suresh_Godaba 

 

Hi 

No you have to change the high availability option to availabilty zone if you want to prevent datacenter outage .

Availability set give you options to have fault domains and update domains to prevent outage due to  unplanned, planned maintenance or an hardware failure inside the datacenter . Now if you want  your workloads to be accessible  in case of a datacenter  failure you need to put your VM in an availability zone or replicate your vms using Azure Site Recovery . Availability Zones are fault-isolated locations within an Azure region, providing redundant power, cooling, and networking . So the difference is while availabilty sets are logical and  scoped to a datacenter,  availability zones are unique  physical locations within a region. Each zone is made up of one or more datacenters equipped with independent power, cooling, and networking.

 

 

https://docs.microsoft.com/en-us/azure/architecture/checklist/resiliency-per-service

 

Got you and thank you in detailed, so the AV sets are Data Center Specific and for HA they (VM) will use FD / UD? right.

AZ's are good right for highly prod VM's to single point of failure.
Yes that's true
Availability sets provide redundancy accross the datacenter while availability zones provide redundancy accross regIon .