Q. Some of my Hyper-V virtual machines (VMs) that have dynamic disks connected to a SCSI controller are offline on VM startup. Why?

A. This is a known problem. A workaround is to change the start behavior of the service STORVSC from 3 to 0, which means the service will be started by the kernel loader.

  1. Start the registry editor (regedit.exe).
  2. Move to HKLM\SYSTEM\CurrentControlSet\Services\storvsc.
  3. Change Start value from 3 to 0 and click OK.
  4. Reboot the VM.
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