What is the difference between VM pause and freeze?

ML-1722 100 Reputation points

Live migration is an operation that doesn't require a reboot and that preserves memory for the VM. It causes a pause or freeze, typically lasting no more than 5 seconds. https://learn.microsoft.com/en-us/azure/virtual-machines/maintenance-and-updates

Is there any distinction between the terms "pause" and "freeze" in the context of live migration for virtual machines?

Azure Virtual Machines
Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
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  1. TP 82,331 Reputation points


    Freeze and pause mean the same thing in terms of live migration. If you take a look at the list of Event types there is a Freeze type with explanation (excerpt from documentation below):

    Expected impact this event will cause. Values:

    • Freeze: The Virtual Machine is scheduled to pause for a few seconds. CPU and network connectivity may be suspended, but there's no impact on memory or open files.
    • Reboot: The Virtual Machine is scheduled for reboot (non-persistent memory is lost). In rare cases a VM scheduled for EventType:"Reboot" may experience a freeze event instead of a reboot. Follow the instructions above for how to know if the event is complete and it's safe to restore your workload.
    • Redeploy: The Virtual Machine is scheduled to move to another node (ephemeral disks are lost).
    • Preempt: The Spot Virtual Machine is being deleted (ephemeral disks are lost). This event is made available on a best effort basis
    • Terminate: The virtual machine is scheduled to be deleted.

    Please click Accept Answer and upvote if the above was helpful.



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    In the context of live migration for virtual machines, the terms "pause" and "freeze" are often used interchangeably to refer to the temporary halt of a VM's execution during the migration process. The pause or freeze typically lasts no more than 5 seconds and is used to transfer the VM's content to a new physical resource.


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