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Verified the bug with:
virt-p2v-0.8.6-5.20120502.1.el6.iso
virt-v2v-0.8.7-6.el6.x86_64
libvirt-0.9.10-16.el6.x86_64
libguestfs-1.16.19-1.el6.x86_64
augeas-0.9.0-3.el6.x86_64

Steps:
1.Download the virt-p2v iso from brewweb.

2.Create MD device /dev/md0 with sda and sdb.

3.Install rhel5 and rhel4 on md0.

4.Use virt-p2v to convert the host on md0,both rhel5 and rhel4 can be converted
successfully without these error messages.

So move the bug to VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-0774.html