Comment # 3 on bug 966061 from Bernhard Wiedemann

(In reply to Martin Pluskal from comment #2)
> qemu-nbd has nothing to do with nbd package, package nbd contains nbd
> server, which is not involved at all when qemu-nbd is used.
> 
> Furthermore you don't need nbd installed when working with qemu-nbd

/usr/sbin/nbd-client is part of the nbd package.
Are there other clients to use the NBD exported by qemu-nbd?

maybe I should have added earlier

Steps To Reproduce:
qemu-nbd /path/to/some.qcow2
nbd-client localhost 10809 /dev/nbd0
mount -o loop,offset=$((2048*512)) /dev/nbd0 /mnt/