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MichaelFlynn-9124 asked RamyaHarinarthini-MSFT commented

Enabling accelerated networking and network disconnect or downtime

In the past enabling accelerated networking had to be done via Powershell and when the VM was deallocated. I noticed there is now a Enable Accelerated Networking button and I enabled it on a non live server. My question is, does this cause any downtime at all and I assume its enabled now without deallocating the server. I would like to do this on a server that is currently live.

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RamyaHarinarthini-MSFT answered

@MichaelFlynn-9124 Welcome to Microsoft Q&A, Thank you for posting your here!!

I have tried to enable the accelerated networking without stop and deallocating the VM in my test subscription however failed with the below.
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When it comes to enabling/disabling Accelerated Networking on existing Azure VMs, if your VM was created individually, without an availability set, you need to stop/deallocate the individual VM to enable Accelerated Networking. If your VM was created within an availability set, or VMSS, all VMs contained in the availability set or VMSS will need to be stopped/deallocated before enabling Accelerated Networking on any of the NICs.

For more info - https://docs.microsoft.com/en-us/azure/virtual-network/create-vm-accelerated-networking-cli#enable-accelerated-networking-on-existing-vms

Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.


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MichaelFlynn-9124 answered RamyaHarinarthini-MSFT commented

I did this without dellocating and did not fail for me.

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@MichaelFlynn-9124 The documentation states that "VMs must be stopped/deallocated before enabling Accelerated Networking on any NIC".

The reason for this is VM with Accelerated Networking must land on a certain type of hardware node that supports the AN features, VM will also guarantee to be on a hardware node that supports AN. In some cases, the action to turn on AN may succeed without stopping each VM, but it is not guaranteed. This means that for the sake of consistency, we recommend to always stop VMs before enabling. Otherwise, we may experience some inconsistency issue.

Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.


Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.

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@MichaelFlynn-9124 Just checking in to see if the above answer helped. If this answers your query, do click “Mark as Answer” and Up-Vote for the same, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know

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