I have a RAID1 array that is supposed to have two Hitachi disks /dev/sdf and /dev/sdg. Instead I think have:
) a degraded RAID1 /dev/md125p1, composed of a single /dev/md/RAID_Hitachi_0_0p1, that has a working filesystem
) a single “Raid Component”/dev/md126 aka /dev/md/RAID_Hitachi_0_0, composed of disks /dev/sdf and /dev/sdg, with apparently no filesystem, and is a component of /dev/md127
) a partially assembled imsm container /dev/md127, with one member, /dev/md/RAID_Hitachi_0_0, wich cannot even be read with parted.

I fear that I have TWO fake-raids, but the only one I wanted, RAID_Hitachi_0_0, has been re-purposed into a raid component of hitachi_mirror_0. Can this be untangled? Or am I stuck reformatting?

Thanks!

Code:
mdadm --detail /dev/md125p1
/dev/md125p1:
        Version : 1.0
  Creation Time : Tue Jan 26 12:06:25 2010
     Raid Level : raid1
     Array Size : 976751968 (931.50 GiB 1000.19 GB)
  Used Dev Size : unknown
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Sun Jul 17 14:31:47 2011
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : hitachi_mirror
           UUID : 781fa619:a0d8b7c6:8b1736ab:0e05354f
         Events : 7232892

    Number   Major   Minor   RaidDevice State
       0     259        0        0      active sync   /dev/md/RAID_Hitachi_0_0p1
       1       0        0        1      removed
Code:
 ls –la /dev/md 
lrwxrwxrwx.  1 root root    8 Jul 17 12:58 hitachi_mirror_0 -> ../md125
lrwxrwxrwx.  1 root root   10 Jul 17 12:59 hitachi_mirror_0p1 -> ../md125p1
-rw-------.  1 root root    5 Jul 17 12:59 md127.pid
srwxr-xr-x.  1 root root    0 Jul 17 12:59 md127.sock=
-rw-------.  1 root root  205 Jul 17 12:58 md-device-map
lrwxrwxrwx.  1 root root    8 Jul 17 14:41 RAID_Hitachi_0_0 -> ../md126
lrwxrwxrwx.  1 root root   10 Jul 17 12:58 RAID_Hitachi_0_0p1 -> ../md126p1
Code:
 mdadm -E -s
ARRAY metadata=imsm UUID=59aa3704:4716e93c:da98c89d:424f6409
ARRAY /dev/md/RAID_Hitachi_0 container=59aa3704:4716e93c:da98c89d:424f6409 member=0 UUID=5ddd9fc2:43d5d2ba:8258f6b9:64a11a3d
ARRAY /dev/md/hitachi_mirror metadata=1.0 UUID=781fa619:a0d8b7c6:8b1736ab:0e05354f name=hitachi_mirror
Code:
 mdadm --detail /dev/md126
/dev/md126:
      Container : /dev/md127, member 0
     Raid Level : raid1
     Array Size : 976762368 (931.51 GiB 1000.20 GB)
  Used Dev Size : 976762368 (931.51 GiB 1000.20 GB)
   Raid Devices : 2
  Total Devices : 2

          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0


           UUID : 5ddd9fc2:43d5d2ba:8258f6b9:64a11a3d
    Number   Major   Minor   RaidDevice State
       1       8       80        0      active sync   /dev/sdf
       0       8       96        1      active sync   /dev/sdg
Code:
 mdadm --detail /dev/md127
/dev/md127:
        Version : imsm
     Raid Level : container
  Total Devices : 2

Working Devices : 2


           UUID : 59aa3704:4716e93c:da98c89d:424f6409
  Member Arrays : /dev/md/RAID_Hitachi_0_0

    Number   Major   Minor   RaidDevice

       0       8       80        -        /dev/sdf
       1       8       96        -        /dev/sdg