Created attachment 840740 [details]
engine, vdsm, libvirt and qemu logs

Description of problem:
diskGetAlignment fails when scanning an align disk on file storage (nfs)
The operation fails with the following error message:

Thread-2521::ERROR::2013-12-23 11:49:27,008::BindingXMLRPC::1003::vds::(wrapper) unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/BindingXMLRPC.py", line 989, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/BindingXMLRPC.py", line 381, in diskGetAlignment
    return api.getDiskAlignment(driveSpecs)
  File "/usr/share/vdsm/API.py", line 682, in getDiskAlignment
    return self._cif.getDiskAlignment(drive)
  File "/usr/share/vdsm/clientIF.py", line 382, in getDiskAlignment
    out = alignmentScan.scanImage(volPath)
  File "/usr/share/vdsm/alignmentScan.py", line 53, in scanImage
    "or guest:\n%s" % err)
VirtAlignError: An error scanning the disk image or guest:
["libguestfs: error: filename cannot contain ':' (colon) character. This is a limitation of qemu."]

Version-Release number of selected component (if applicable):
is28.1
vdsm-4.13.2-0.3.el6ev.x86_64
libvirt-0.10.2-29.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.415.el6.x86_64
rhevm-3.3.0-0.41.el6ev.noarch

How reproducible:
100%

Steps to Reproduce:
On NFS DC:
1. run a VM with RHEL OS installed
2. scan alignment the VM disk 


Actual results:
The operation fails with the mentioned error

Expected results:
Scan alignment should work for file storage

Additional info:
engine, vdsm, libvirt and qemu logs