Comment 1 for bug 971621

This problem happens with:

a) qcow2 root disk images (nbd block devices) ==> As described above

disk: qcow2 format

instance1 .../instance-00000001/disk --> nbd15 --> .../instance-00000001/rootfs
instance2 .../instance-00000002/disk --> nbd14 --> .../instance-00000002/rootfs
instance3 .../instance-00000003/disk --> nbd13 --> .../instance-00000003/rootfs

but also with:

b) raw root disk images (loop block devices)

nova.conf: use_cow_images=False

disk: raw format

instance1 .../instance-00000001/disk --> loop0 --> .../instance-00000001/rootfs
instance2 .../instance-00000002/disk --> loop1 --> .../instance-00000002/rootfs
instance3 .../instance-00000003/disk --> loop2 --> .../instance-00000003/rootfs