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RnD0102 avatar image
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RnD0102 asked SamCogan answered

What is the difference between Azure Host Dedicated and Azure VM Isolation?

Hii, can anyone please explain to me about Azure Host Dedicated and Azure VM Isolation?


VM isolation is Azure Compute offers virtual machine sizes that are Isolated to a specific hardware type and dedicated to a single customer.

Azure Dedicated Host provides physical servers that host one or more Azure virtual machines. Your server is dedicated to your organization and workloads—capacity isn’t shared with other customers. This host-level isolation helps address compliance requirements. As you provision the host, you gain visibility into (and control over) the server infrastructure, and you determine the host’s maintenance policies.

Question And please correct me if I have misunderstanding :
1. what is the meaning of "specific hardware type on vm isolated"? Does the isolated only apply to one hardware resource such as CPU, RAM, disk based on the size VM family?

  1. and if vm isolated = dedicate server (All resource dedicated/Not shared) based on the scalability of VMs isolate & Azure hosts have in common. so what is azurehost purpose?

  2. To choose the right cloud computing service, when should I choose VM isolation? and when will I choose the azure host?

azure-virtual-machines
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1 Answer

SamCogan avatar image
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SamCogan answered

An isolated VM is isolated due to the fact that the size of VM happens to take up the whole of the underlying host, whereas a dedicated host is a host that is specifically to you for your use only.

This is an important distinction for two reasons:
1. Isolated VM's could become non-isolated in the future as hardware changes and underlying hosts get bigger. We are seeing this right now with the D15_V2 VM's going from isolated to non-isolated in February 2020
2. A dedicated host is a host dedicated to you, onto which you can deploy any number of VM's of different sizes (up to the capacity of the host), where as an isolated VM is just a single VM

There are also additional benefits of a dedicated host such as:

  • Control over maintenance and patching events on the host

  • Use of Azure Hybrid licence benefit


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