When creating a managed disk from another disk, does it have the same background copy performance penalty as when creating from a snapshot?

Noah S 121 Reputation points
2024-09-17T18:07:55.9866667+00:00

For creating a disk from a snapshot, Microsoft docs say:

When you create a managed disk from a snapshot, it starts a background copy process. You can attach a disk to a VM while this process is running but you'll experience performance impact.

Is the same true if creating a managed disk using another managed disk as a source? Is it a fully complete clone or is there still a background copy involved?

Azure Virtual Machines
Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
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Azure Disk Storage
Azure Disk Storage
A high-performance, durable block storage designed to be used with Azure Virtual Machines and Azure VMware Solution.
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  1. deherman-MSFT 37,161 Reputation points Microsoft Employee
    2024-09-19T15:23:41.1333333+00:00

    @Noah S

    Thanks for your patience while I confirmed this with our service team.
    Any time a disk is created from another source (including being copied from another disk) there is a background copy operation from the source disk to the destination (new) disk. Performance of the target (new) disk will be degraded until the copy is complete.

    Hope this helps. Let me know if you have any more questions and I will do my best to assist.


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