Availability Sets in Azure enable users to separate workloads for high availability. All of the VMs in an availability set must be in the same Azure Virtual Network, which means they must be in the same Abiquo virtual datacenter.
To add a group of VMs to a basic load balancer in Azure, you must have all the VMs in the same availability set. If you do not add your VMs to an availability set, they will effectively be in different availability sets
After an upgrade, to display availability sets that were not present in the platform with deployed VMs, the user should synchronize the virtual datacenter or networks.
For more information about Azure Availability sets, see Azure documentation, for example, https://docs.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-availability-sets .
Privileges: Manage availability sets, Assign availability set to VM
Display availability sets
To display the availability sets in an Azure region:
Go to Cloud virtual datacenters view → Locations
Select an Azure location
Go to Network → Availability sets
You can create an availability set at the regional level and later assign it to a virtual datacenter.
To display the availability sets in an Azure virtual datacenter:
Select the virtual datacenter
Go to Network → Availability sets
Create an availability set
You can use availability sets to ensure high availability for your VMs in Azure. Each VM in the availability set will deploy on separate, isolated hardware, in a cluster. This is similar to the platform's concept of anti-affinity layers in private cloud. To attach Azure VMs to a basic load balancer, you must add them to the same Availability set. All of the VMs in an Availability set must be in the same Azure Virtual Network, which means they must be in the same virtual datacenter but they can belong to different Resource groups.
To create an availability set:
Go to myCloud → Locations
Select a location OR select an Azure virtual datacenter
Go to Network → Availability sets
Click the + add button
Complete the dialog and click Save
The Name of the availability set must be unique in your location
From Azure documentation: "VMs in the same fault domain share common storage as well as a common power source and network switch".
From Azure documentation: "An update domain is a group of VMs and underlying physical hardware that can be rebooted at the same time."
For more information about Azure Availability sets, see Azure documentation, for example, https://docs.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-availability-sets .
Assign an availability set to a VM
When you create a VM, you can select an Availability set. This is similar to the VM layers feature in private cloud.
Before you deploy the VM, to change the availability set, you can edit the VM and select another availability set.
If the user does not deploy the VM before the VDC is synchronized, the platform will remove the VM from the Availability set during the synchronization process.