Strange. So, devstack thinks it created the volume group but it is not showing up as a VG in your vgs output? Did you maybe reboot your VM after running devstack, losing the mounted /dev/loop0 device? What do you get from losetup -a ?
Strange. So, devstack thinks it created the volume group but it is not showing up as a VG in your vgs output? Did you maybe reboot your VM after running devstack, losing the mounted /dev/loop0 device? What do you get from losetup -a ?