Re: [libvirt] [PATCH 0/2] qemu: add new disk type='lun' for bus='virtio'

On 12/23/2011 12:15 AM, Daniel P. Berrange wrote: > The 'type' attribute refers to how the host emulator deals with the > disk. > > The 'device' attribute refers to what type of device hardware is exposed > to the guest. > > What we're doing here is controlling whether the host emulator allows > SG_IO. The guest visible device hardware has not changed at all. Thus > using the 'type' attribute is the correct approach. You could also say that the host is still accessing the device in the same way (via /dev/sdX). The guest visible device changes because in one case it allows SG_IO, in the other it doesn't, even if the host device is the same.