[ovirt-users] Re: [OT] Major and minor numbers assigned to /dev/vdx virtio devices

On Wed, Jul 1, 2020 at 5:55 PM Gianluca Cecchi <gianluca.cecchi@gmail.com> wrote:

Hello, isn't there an official major/minor numbering scheme for virtio disks? Sometimes I see 251 major or 252 or so... what is the udev assignment logic? Reading here: https://www.kernel.org/doc/Documentation/admin-guide/devices.txt

240-254 block LOCAL/EXPERIMENTAL USE Allocated for local/experimental use. For devices not assigned official numbers, these ranges should be used in order to avoid conflicting with future assignments.

it seems they are in the range of experimental ones, while for example Xen /dev/xvdx devices have their own static assignment (202 major)

This question belongs to qemu-discuss. Also added some people that may help. Nir