the Virtio SCSI controller, is an older type of paravirtualized controller
which has been superseded in features by the Virtio SCSI Controller.
+[thumbnail="qm-hard-disk.png"]
On each controller you attach a number of emulated hard disks, which are backed
by a file or a block device residing in the configured storage. The choice of
a storage type will determine the format of the hard disk image. Storages which