1 If you are using Virtio
The following will work if you have a virtual server (KVM-Linux) using virtio with the operating system installed on the first storage device:
2 If you are not using virtio
The following will work if you have a dedicated server (or in case you are not using virtio) with the operating system installed on the first storage device:
It is now fixed. You shouldn't see that message anymore in the following reboots.