(See attachment for full log) https://github.com/rwmjones/guestfs-tools/blob/master/cat/test-virt-filesyst... This test uses virt-filesystems to list the filesystems in the Fedora phony disk image. In one run of this test it found an "extra" /dev/sdb2 filesystem that obviously doesn't exist. Note that the log contains two runs of virt-filesystems, only the second one shows a failure. In the log we see that the appliance has two disks, sda is the appliance root, sdb is the Fedora image. Device name translation will map these two disks in reverse so to virt-filesystems the Fedora image should appear as /dev/sda and the partitions as /dev/sda{1,2}. The problem seems to be with the call to guestfs_pvs_full which returns: <struct guestfs_lvm_pv_list(1) = [0]{pv_name: /dev/sdb2, <-------------------- pv_uuid: RVgEshd4X91jq8omUQIsB77eyB9miZzL, pv_fmt: lvm2, pv_size: 532676608, dev_size: 536838656, pv_free: 130023424, pv_used: 402653184, pv_attr: a--, pv_pe_count: 127, pv_pe_alloc_count: 96, pv_tags: , pe_start: 1048576, pv_mda_count: 1, pv_mda_free: 519168, }> Note that the pv_name returned to virt-filesystems is not reverse translated, so it returns the appliance name (/dev/sdb2) not the translated name (/dev/sda2) of the partition containing the Fedora PV. I will try for a patch which does reverse translation on this field. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top