Hello guys, I've a doubt regarding Azure VMSS, because I know that VM in Availability zone is used only to distribute VM to multiple zones but they will be completely indipendently. But in case of Virtual Machine Scale Sets, if I will add 3 identical VM (for example 3 Windows server 2022 with some agents) to a Scale Set in different zones, they will be syncronized ? for example some configuration, updates, etc..? And can Flexible vs Uniform orchestration mode impact to this behavior? thanks !

@Andrea VMSS allows you to automatically scale up and down based on your demand. It also allows the ability to automatically replace unhealthy VMs. It simplifies management, since you don't need to manage the VMs separately. You can also configure VMSS to span across multiple availability zones . The overview page covers VMSS in more detail. Let me know if you have any questions or are needing help with any specific features. If you still have questions, please let us know in the " comments" and we would be happy to help you. Comment is the fastest way of notifying the experts. If the answer has been helpful, we appreciate hearing from you and would love to help others who may have the same question. Accepting answers helps increase visibility of this question for other members of the Microsoft Q&A community. Thank you for helping to improve Microsoft Q&A!

Virtual Machine Scale Sets vs Availability Zone

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deherman-MSFT 37,851 Reputation points Microsoft Employee

2024-10-14T15:19:11.9233333+00:00

@Andrea

VMSS allows you to automatically scale up and down based on your demand. It also allows the ability to automatically replace unhealthy VMs. It simplifies management, since you don't need to manage the VMs separately. You can also configure VMSS to span across multiple availability zones.

The overview page covers VMSS in more detail. Let me know if you have any questions or are needing help with any specific features.

If you still have questions, please let us know in the "comments" and we would be happy to help you. Comment is the fastest way of notifying the experts.

If the answer has been helpful, we appreciate hearing from you and would love to help others who may have the same question. Accepting answers helps increase visibility of this question for other members of the Microsoft Q&A community.

Thank you for helping to improve Microsoft Q&A!
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Andrea 256 Reputation points

2024-10-15T07:24:58.33+00:00

So VMSS can be useful to migrate on-premise cluster nodes to cloud, instead of VM in Availability Zone that is useful to span VM standalone across zone, is it correct?

In this case , if I have a windows cluster (not SQL) with 3 nodes , can I rehost its with Azure Migrate or I need to reinstall new VMs?

deherman-MSFT 37,851 Reputation points Microsoft Employee

2024-10-15T17:12:08.34+00:00

@Andrea

If all these VMs are running the same image then yes it would be suitable for running on VMSS which helps facility spanning across availability zones. However, if these are individual VMs with different images they would need to be deployed individually without VMSS.

Yes, you should be able to migrate these with Azure Migrate.
https://learn.microsoft.com/en-us/azure/migrate/tutorial-migrate-physical-virtual-machines

Andrea 256 Reputation points

2024-10-16T08:05:48.04+00:00

hi deherman, what do you mean with "image"? these on-prem nodes are hosted on VMware vsphere and they are windows server 2022, the installation of these servers was done with classic ISO disco installer. Furthermore these nodes are part of windows cluster, so is it possible to migrate with Azure Migrate tool or is it necessary to create new VMs on Azure (in Scale Set) and then reinstall applications?

deherman-MSFT 37,851 Reputation points Microsoft Employee

2024-10-16T15:58:18.5+00:00

Are these VMs all configured excactly the same? If so, they could be migrated to VMSS. If not, then they should be migrated individually and deployed seperately. Yes, you can migrate VMware VMs.

https://learn.microsoft.com/en-us/azure/migrate/vmware/server-migrate-overview
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Virtual Machine Scale Sets vs Availability Zone

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