Problem Description
-------------------------------
While doing Fedroa 18 ppc64 alpha VNC type installation on P7 LPAR , installation got blocked with unknown error occurred on "Installation summary " screen (see attached screenshot install-log1.txt).

Note that I am able to install other LPARS using same repo , but the current system where this issue got hit is currently having RAID configuration on top of LVM with Fedora17 installed.I looked into reason tab on anaconda VNC log screen (see attached screen shot install-log4.txt) , it says  " AttributeError:'MdRaidArrayDevice' Object has no attribute 'isMagic' "


--- Details information previous state of the system ---

System was earlier installed with Fedora17 and was having LVM volumes on top of RAID5 , which is on top of multipath disks.
Here are the details of the state of the system before F18 installation test:

[root@miz04 ~]# uname -a
Linux miz04.austin.ibm.com 3.3.4-5.fc17.ppc64 #1 SMP Mon May 14 10:18:37 MST 2012 ppc64 ppc64 ppc64 GNU/Linux

[root@miz04 ~]# pvscan 
  Found duplicate PV q50if4DipE96H1Flq9TrBKkm41yDS93b: using /dev/sdj1 not /dev/sdb1
  PV /dev/sdj1   VG myvg       lvm2 [10.00 GiB / 9.98 GiB free]
  PV /dev/sda3   VG vg_miz04   lvm2 [20.50 GiB / 0    free]
  Total: 2 [30.50 GiB] / in use: 2 [30.50 GiB] / in no VG: 0 [0   ]
[root@miz04 ~]# vgscan 
  Reading all physical volumes.  This may take a while...
  Found duplicate PV q50if4DipE96H1Flq9TrBKkm41yDS93b: using /dev/sdj1 not /dev/sdb1
  Found volume group "myvg" using metadata type lvm2
  Found volume group "vg_miz04" using metadata type lvm2
[root@miz04 ~]# lvscan 
  Found duplicate PV q50if4DipE96H1Flq9TrBKkm41yDS93b: using /dev/sdj1 not /dev/sdb1
  ACTIVE            '/dev/myvg/myvol1' [12.00 MiB] inherit
  ACTIVE            '/dev/vg_miz04/lv_swap' [3.91 GiB] inherit
  ACTIVE            '/dev/vg_miz04/lv_root' [16.59 GiB] inherit
[root@miz04 ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] 
md0 : active raid6 sdk[1] sdl[2] sde[3] sdb[0]
      31452672 blocks super 1.2 level 6, 512k chunk, algorithm 2 [5/4] [UUUU_]
      
unused devices: <none>
[root@miz04 ~]#  mdadm --detail /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Fri Jun  1 07:17:23 2012
     Raid Level : raid6
     Array Size : 31452672 (30.00 GiB 32.21 GB)
  Used Dev Size : 10484224 (10.00 GiB 10.74 GB)
   Raid Devices : 5
  Total Devices : 4
    Persistence : Superblock is persistent

    Update Time : Thu Sep 27 18:31:25 2012
          State : clean, degraded 
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 512K

           Name : miz04.austin.ibm.com:0  (local to host miz04.austin.ibm.com)
           UUID : 3b7a77c3:74369530:dd64485b:d1f8e943
         Events : 6812

    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   /dev/sdb
       1       8      160        1      active sync   /dev/sdk
       2       8      176        2      active sync   /dev/sdl
       3       8       64        3      active sync   /dev/sde
       4       0        0        4      removed


I rebooted the system and went for fedora 18 installation , where I noticed installation could not proceed due to "due to unknown error occurred "

Attached full installation console log "miz04-install-log.txt"

Thanks...
Manas