Managed Disk Copy from snapshot

Mr. B 26 Reputation points
2021-03-07T15:44:35.343+00:00

We have about 1.5 TB database file hosted on managed disk. During emergency expansion we did like to create copies of this managed disk. Our approach is to take a snapshot of this managed disk and create new disks using this snapshot as source.

Questions:

  1. How much time does it take for the snapshot to rehydrate (copy all data from source to snapshot)?
  2. How must time does it take for a new disk to rehydrate from snapshot?
  3. Is there a way to know if the new disk is completed hydrated?
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. Sumarigo-MSFT 45,406 Reputation points Microsoft Employee
    2021-03-09T06:33:25.84+00:00

    @Mr. B Welcome to Microsoft Q&A, Thank you for posting your query!

    Firstly, apologies for the delay in responding here and any inconvenience this issue may have caused.

    There is no such timings for creating a snapshot but it should complete in a couple of mins(based on the size). Same is the case for creating a disk from snapshot.

    A snapshot is a full, read-only copy of a VHD. This itself means it's hydrated

    Hope this helps!

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

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  1. Mr. B 26 Reputation points
    2021-03-09T17:08:52.07+00:00

    Thanks Sumarigo for the response.

    Are there any restrictions on the bandwidth during hydration process? It seems very fast when compared to a file copy operation of same size which is bound by the provisioned bandwidth of the disk.

    Is there any white paper or blog explaining the details on how the hydration is performed?

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