firstly,i've updated libguestfs before the tests,
# guestfish --version
guestfish 1.16.19rhel=6,release=1.el6
>
> Secondly, use the regular qemu and kernel packages supplied by Red
> Hat. These contain all the bits needed for libguestfs to work, and
> have been extensively tested.
secondly,the regular qemu supplied by redhat does not support disk
only snapshot using libvirt,so i am tring to solve these problems. and
yestoday i found that qemu-kvm-0.14.1 works correct with guestfish ,
thanks.
qemu-kvm-1.1-rc4 does not support guestfish 1.16.19 too....