Unique system parameters even in case of VM clone

Joshi, Anand [AUTOSOL/PSS/IN] 0 Reputation points
2026-06-12T06:40:12.6166667+00:00

Hello,

I am looking for some unique parameters with which I can identify the virtual machine uniquely. Even if VMs are clonned (by any type of option available), I should get the different values for different VMs i.e. original and clone should have different values. Please let me know list of such parameters.

Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
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  1. Nam Bui (WICLOUD CORPORATION) 1,195 Reputation points Microsoft External Staff Moderator
    2026-06-15T00:59:19.7166667+00:00

    Hello Joshi ,

    thank you for posting in the Microsoft Q&A community. Here is a direct response to your requirement.

    There is no single built-in parameter that is guaranteed to differ between an original VM and its clone across all cloning methods. Identifiers such as BIOS UUID, MAC address, hostname, SID, and disk ID can still end up duplicated, depending on how the VM is cloned or imported.

    For Hyper-V, the closest built-in identifier is the VMID. It is regenerated when a VM is imported using the “Copy the virtual machine (create a new unique ID)” option, so the original and the clone will have different values. You can query it from the Hyper-V host:

    Get-VM -Name "<VMName>" | Select-Object Name, VMId

    Please note two points:

    • VMID is a host-side identifier, not a value reliably exposed inside the guest OS.
    • VM Generation ID is not suitable for this case, because it can also change during a snapshot/checkpoint revert, while your requirement is clone-only.

    Recommendation:

    • From the host side: use the Hyper-V VMID for clone identification.
    • From inside the guest OS: no built-in parameter is guaranteed to be unique across all clone methods.
    • For a fully reliable solution: generate and store your own custom GUID during VM provisioning/customization, and regenerate it only when a new clone is created.

    I hope the response provided some helpful insight. If you find this answer useful, please hit “accept answer” so I know it addressed your concern.

    Best regards,

    Titus

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  2. Joshi, Anand [AUTOSOL/PSS/IN] 0 Reputation points
    2026-06-12T06:43:38.0033333+00:00

    I need unique ID for clone only and not for the snapshot revert

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  3. AI answer

    2026-06-12T06:40:23.4033333+00:00

    For virtual machines on Hyper-V, a key mechanism designed specifically to distinguish cloned or snapshotted VMs is the VM Generation ID.

    From the technical reference:

    • VM Generation ID is a 128-bit integer assigned to a VM by the hypervisor.
    • It is exposed to the guest (for example, via ACPI on Hyper-V).
    • The value is reset whenever a snapshot is applied or similar operations occur.

    Because of this behavior, a VM and its clone (or a VM before and after snapshot/restore) will have different VM Generation IDs, and software inside the guest can use this to detect that it is running as a different instance than before, or that it has been cloned/rolled back.

    Other identifiers (such as MAC address, computer name, IP address, etc.) can be duplicated or manually copied when cloning and therefore are not guaranteed to be unique across original and clone. The VM Generation ID is specifically intended to provide a reliable, hypervisor-backed identity change signal for virtualized workloads (for example, virtualized domain controllers).

    References:

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