Protecting a standalone VM against both zonal and regional failure.

Dan 176 Reputation points


I am currently looking into our BCDR planning and looking at how to best protect an individual VM where it is not possible to have multiple VMs.

I am planning on using ASR to replicate to another region but I am also looking into the possibility of a zonal failure.

One thought is that we could have subnets dedicated to a zone and then pin all individual VMs to this subnet and zone, this would then allow us to route all traffic for this subnet to a second region if a zone were to fail, this would only require replication to the second region.

I can't find any references to this approach anywhere, so I'm wondering if there is a better way to achieve this, or if there are any drawbacks of pinning a VM to a zone when it is standalone.


Azure Site Recovery
Azure Site Recovery
An Azure native disaster recovery service. Previously known as Microsoft Azure Hyper-V Recovery Manager.
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  1. Leon Laude 85,726 Reputation points


    You can configure Availability Zones for your VMs, availability zones are unique physical locations within an Azure region:

    To protect an Azure VM from a regional failure, you can indeed use Azure Site Recovery:

    Quickstart: Set up disaster recovery to a secondary Azure region for an Azure VM

    For more information about high availability alternatives for your Azure VMs, you can read more here:

    Availability options for virtual machines in Azure

    Best regards,

  2. SadiqhAhmed-MSFT 41,296 Reputation points Microsoft Employee

    @probi Replication and failover from region 1, zone 1 to region 2 is supported. You can then failback from region 2 to region 1, zone 1.

    I don’t think VNets are zone-aware, and therefore cannot be pinned to a specific Zone. As for re-routing traffic to a different region, that’s where something like Traffic Manager could be used.

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