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What will happen to data disk when we degrade Azure VM size? RRS feed

  • Question

  • Hi,

    I have a A4 size Azure VM and I have added 16 data disk to the VM and created one single stripe volume and storing data to it.

    Now what will happen to my volume if I change the VM size from A4 to A3 or A2? as A3 supports only 8 data disks and A2 supports only 4 data disk.

    a quick answer will be highly appreciated.

    Thanks

    Ganges

    Wednesday, April 22, 2015 2:17 PM

Answers

  • In Azure V1, i.e. http://manage.windowsazure.com which is currently in production, when deploying an A4 VM and attaching 8 data disks, you will still see A3, A2, and A1 available in the VM size dropdown list on the configuration page of the VM instance. However when trying to change the VM size from A4 with 8 data disks attached to A2 which allows 4 data disks, for instance, you will get the error, Failed to configure virtual machine. 

    In Azure v2, i.e. http://portal.azure.com which is still in preview, you won't see any VM size with attachable disks fewer than 8 included as available.

    HTH.

    Tuesday, July 14, 2015 3:57 PM

All replies

  • In Azure V1, i.e. http://manage.windowsazure.com which is currently in production, when deploying an A4 VM and attaching 8 data disks, you will still see A3, A2, and A1 available in the VM size dropdown list on the configuration page of the VM instance. However when trying to change the VM size from A4 with 8 data disks attached to A2 which allows 4 data disks, for instance, you will get the error, Failed to configure virtual machine. 

    In Azure v2, i.e. http://portal.azure.com which is still in preview, you won't see any VM size with attachable disks fewer than 8 included as available.

    HTH.

    Tuesday, July 14, 2015 3:57 PM
  • Agreed. You won't be able to "downgrade" the VM to a smaller size if it has more disks than is supported by that specific size. 

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    AdinE MCSE, MCSA, MCITP, MCTS; (Specializing in System Center Cloud and Datacenter Management)
    2015 Microsoft MVP in System Center Cloud and Datacenter Management
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    Tuesday, July 14, 2015 4:03 PM