Azure Scale Set vs Availability Set

Last updated on June 3, 2023

	Availability Set	Scale Set
Description	A group of discrete virtual machines spread across fault domains.	A group of identically configured virtual machines spread across fault domains.
Workloads	Use Availability Set for predictable workloads.	Use Scale Set for unpredictable workloads (autoscale).
Domain default	Has 3 fault domains and 5 update domains by default	Has 5 fault domains and 5 update domains by default
Configuration	Virtual machines are created from different images and configurations.	Virtual machines are created from the same image and configuration.
Distribution	Virtual machines are automatically distributed within a data center.	Virtual machine scale sets can be distributed within a single datacenter or across multiple data centers.
Number of VMs	You can only add a virtual machine to the availability set when it is created.	Scale sets can increase the number of virtual machines based on demand.
Pricing	Availability set has no additional charge. You only pay for the computing resources.	Scale sets have no additional charge. You only pay for the computing resources.

Sources:

https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/overview
https://docs.microsoft.com/en-us/azure/virtual-machines/availability
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/manage-availability

Written by: Jon Bonso

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Azure Scale Set vs Availability Set

Azure Scale Set vs Availability Set

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