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This topic describes common workarounds of issues that you might encounter while backing up or restoring Hyper-V virtual machines. 

Linux virtual machine boots into maintenance mode after restore

If the disk sequence changes after restore, the boot order changes for the Linux virtual machine and the virtual machine boots into maintenance mode or some virtual disks are not visible. 


For the Linux virtual machine, change the disk sequence in /etc/fstab.  The virtual machine boots without any problem after you enter the correct disk sequence. For more information, see RedHat documentation. [External link]

Virtual machine restored to an alternate host fails to start

When VM is restored on another host, sometimes it fails to start with an error: 'Unnamed VM' could not initialize. (Virtual machine ID).
The event log shows the error: The security ID structure is invalid (0x80070539).


On the Hyper-V host:

  1. Open an administrative PowerShell command window.
  2. Run:
    Grant-VMConnectAccess -VMName "Name of VM that is not starting" -UserName "Domain and username of the current user"

For more information, see Virtual machine cannot start - The security ID structure is invalid (0x80070539) [External link to a Microsoft support article.]

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