On Fri, 15 Feb 2013, Dragon wrote:

         Magic : a92b4efc
       Version : 1.2
   Feature Map : 0x0
    Array UUID : 92a99ca0:8e22bc66:f8050881:78c344d9
          Name : mfsnode1:2  (local to host mfsnode1)
 Creation Time : Tue Jul 24 18:18:21 2012
    Raid Level : raid5
  Raid Devices : 6

Avail Dev Size : 5842757597 (2786.04 GiB 2991.49 GB)
    Array Size : 29213783040 (13930.22 GiB 14957.46 GB)
 Used Dev Size : 5842756608 (2786.04 GiB 2991.49 GB)
   Data Offset : 2048 sectors
  Super Offset : 8 sectors
         State : clean
   Device UUID : 6a679a1d:f42d6b9f:a13cd977:0fdbea86

   Update Time : Mon Dec 17 00:13:56 2012
      Checksum : 8c50873e - correct
        Events : 211768

        Layout : left-symmetric
    Chunk Size : 512K

As far as I can tell, it looks like data offset, super offset,superblock 
version all match what you have after doing --create. So this is good.

mdadm -E /dev/sdd4
        Events : 0

mdadm -E /dev/sdf4
        Events : 0

Do you have any idea how this happened?

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se