Description of problem:
setting up the installation enviroment (root password) anaconda 21.23-1 MATE f21 (rawhide) koji - todays

Version-Release number of selected component:
anaconda-core-21.23-1.fc21.x86_64

The following was filed automatically by anaconda:
anaconda 21.23-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/parted/disk.py", line 213, in commit
    return self.__disk.commit()
  File "/usr/lib64/python2.7/site-packages/parted/decorators.py", line 41, in new
    ret = fn(*args, **kwds)
  File "/usr/lib/python2.7/site-packages/blivet/formats/disklabel.py", line 271, in commit
    self.partedDisk.commit()
  File "/usr/lib/python2.7/site-packages/blivet/formats/disklabel.py", line 250, in create
    self.commit()
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 470, in execute
    options=self.device.formatArgs)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 265, in processActions
    action.execute()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 314, in doIt
    self.devicetree.processActions()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 172, in turnOnFilesystems
    storage.doIt()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/install.py", line 142, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall)
  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)
IOException: Input/output error during write on /dev/sdb

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   initrd=initrd0.img root=live:CDLABEL=Fedora-Live-MATE-Compiz-x86_64-r rootfstype=auto ro rd.live.image quiet  rhgb rd.luks=0 rd.md=0 rd.dm=0  BOOT_IMAGE=vmlinuz0 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.14.0-0.rc3.git2.1.fc21.x86_64
other involved packages: python-blivet-0.42-1.fc21.noarch, python-libs-2.7.6-4.fc21.x86_64, pyparted-3.9.2-1.fc21.x86_64
product:        Fedora
release:        Fedora release 21 (Rawhide)
type:           anaconda
version:        rawhide

Potential duplicate: bug 964147