Description of problem:
do a network install of fc21 alpha RC2 on ppc64 guest


Version-Release number of selected component:
anaconda-21.48.10-1

The following was filed automatically by anaconda:
anaconda 21.48.10-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/formats/__init__.py", line 370, in create
    raise FormatCreateError("invalid device specification", self.device)
  File "/usr/lib/python2.7/site-packages/blivet/formats/prepboot.py", line 76, in create
    DeviceFormat.create(self, **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 559, in execute
    options=self.device.formatArgs)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 361, in processActions
    action.execute(callbacks)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 364, in doIt
    self.devicetree.processActions(callbacks)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 216, in turnOnFilesystems
    storage.doIt(callbacks)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/install.py", line 190, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall, callbacks=callbacks_reg)
  File "/usr/lib64/python2.7/threading.py", line 766, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 227, in run
    threading.Thread.run(self, *args, **kwargs)
FormatCreateError: ('invalid device specification', '/dev/sda1')

Additional info:
addons:         com_redhat_kdump
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   BOOT_IMAGE=/ppc/ppc64/vmlinuz ro
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.17.0-301.fc21.ppc64
product:        Fedora"
release:        Cannot get release name.
type:           anaconda
version:        Fedora