+++ This bug was initially created as a clone of Bug #1085057 +++

Description of problem:
On an Asus P5Q-EM motherboard w/E8600 cpu, and a pair of identical seagate hdd's set up in the BIOS as a RAID-1 mirror set.

Booted from a 4GB USB stick created elsewhere with 
livecd-iso-to-disk --format --reset-mbr fedora-live-desktop.iso  /dev/sdd

USB booted to desktop, then  selected "install to hard disk", language selection screen comes up, wait a few seconds and anaconda declares the error.

Version-Release number of selected component:
anaconda-core-21.31-1.fc21.x86_64

The following was filed automatically by anaconda:
anaconda 21.31-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/devicelibs/mdraid.py", line 59, in get_raw_array_size
    raise MDRaidError("get_raw_array_size is not defined for level container.")
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 3260, in rawArraySize
    smallestMemberSize)
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 3266, in superBlockSize
    return mdraid.get_raid_superblock_size(self.rawArraySize,
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 3290, in size
    smallestMemberSize = self.smallestMember.size - self.superBlockSize
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 575, in __str__
    s = "%s %s %s" % (exist, self.size, super(StorageDevice, self).__str__())
  File "/usr/lib/python2.7/site-packages/blivet/storage_log.py", line 45, in log_method_return
    logging.getLogger("blivet").debug(fmt % fmt_args)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2190, in getDeviceByUuid
    log_method_return(self, found)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1509, in handleUdevMDMemberFormat
    md_array = self.getDeviceByUuid(device.format.mdUuid, incomplete=True)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1800, in handleUdevDeviceFormat
    self.handleUdevMDMemberFormat(info, device)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1194, in addUdevDevice
    self.handleUdevDeviceFormat(info, device)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2083, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2019, in populate
    self._populate()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 429, in reset
    self.devicetree.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 146, in storageInitialize
    storage.reset()
  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)
MDRaidError: get_raw_array_size is not defined for level container.

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   initrd=initrd0.img root=live:UUID=9082-6045 rootfstype=vfat rw rd.live.image overlay=UUID=9082-6045 quiet  rhgb rd.luks=0 rd.md=0 rd.dm=0  BOOT_IMAGE=vmlinuz0 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.15.0-0.rc0.git9.1.fc21.x86_64
other involved packages: python-blivet-0.47-1.fc21.noarch, python-libs-2.7.6-4.fc21.x86_64
product:        Fedora
release:        Fedora release 21 (Rawhide)
type:           anaconda
version:        rawhide

--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:05 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:07 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:08 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:11 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:13 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:14 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:16 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:18 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:19 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 13:15:21 EDT ---



--- Additional comment from Kevin R. Porter on 2014-04-07 21:53:46 EDT ---


Oddly enough, while F21 (bug occurs on Rawhide 20140406 X64 "live desktop" nightly build) chokes on my Intel BIOS raid-1 mirror set...the older
F20 installs just fine on the same hardware.  I.e. this bug would appear to be something new in Anaconda's code since F20?

--- Additional comment from mulhern on 2014-04-08 09:00:39 EDT ---

There are a few levels of problem here:

1) In log_method_return() the debug() method is called using the format operator. It is possible to pass the fmt_args as arguments to the debug() method, which ought to cause the exception to be logged instead of raised. pylint did not report W1201 for some reason for this line.
2) An exception is raised when get_raw_array_size() is called for a container object. Should this choice itself be re-evaluated? If not:
3) Then we cannot assume that superBlockSize() must always succeed, as self.rawArraySize() may raise an exception. We need to decide whether the exception should be handled in superBlockSize or rawArraySize and how.