On 01/10/2013 09:23 AM, chris wrote:

Hello,

I have a machine which was running a imsm raid volume, where the
motherboard failed and I do not have access to another system with
imsm. I remember noticing some time ago that mdadm could recognize
these arrays, so I decided to try recovery in a spare machine with the
disks from the array.

I guess my questions are:
Is this the right forum for help with this?
Am I even going down a feasible path here or is this array dependent
on the HBA in some way?
If it is possible any ideas of anything else I can do to debug this further?

Typically mdadm probes the OROM and look for platform details. But you 
can try overriding with:
export IMSM_NO_PLATFORM=1

See if that works for you.

The original array was a raid 5 of 4x2TB sata disks

When I examine the first disk, things look good:

mdadm --examine /dev/sdb
mdadm: /dev/sdb is not attached to Intel(R) RAID controller.
mdadm: /dev/sdb is not attached to Intel(R) RAID controller.
/dev/sdb:
           Magic : Intel Raid ISM Cfg Sig.
         Version : 1.3.00
     Orig Family : 226cc5df
          Family : 226cc5df
      Generation : 000019dc
      Attributes : All supported
            UUID : b67ea029:aaea7da2:2540c1eb:ebe98af1
        Checksum : 651263bf correct
     MPB Sectors : 2
           Disks : 4
    RAID Devices : 1

   Disk02 Serial : Z1E1RPA9
           State : active
              Id : 00030000
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

[Volume0]:
            UUID : 51a415ba:dc9c8cd7:5b3ea8de:465b4630
      RAID Level : 5
         Members : 4
           Slots : [__U_]
     Failed disk : 0
       This Slot : 2
      Array Size : 11721072640 (5589.04 GiB 6001.19 GB)
    Per Dev Size : 3907024648 (1863.01 GiB 2000.40 GB)
   Sector Offset : 0
     Num Stripes : 15261814
      Chunk Size : 128 KiB
        Reserved : 0
   Migrate State : idle
       Map State : failed
     Dirty State : clean

   Disk00 Serial : Z1E1AKPH:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

   Disk01 Serial : Z24091Q5:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

   Disk03 Serial : Z1E19E4K:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)


When I try to scan for arrays I get this:
# mdadm --examine --scan
HBAs of devices does not match (null) != (null)
ARRAY metadata=imsm UUID=b67ea029:aaea7da2:2540c1eb:ebe98af1
ARRAY /dev/md/Volume0 container=b67ea029:aaea7da2:2540c1eb:ebe98af1
member=0 UUID=51a415ba:dc9c8cd7:5b3ea8de:465b4630
ARRAY metadata=imsm UUID=b67ea029:aaea7da2:2540c1eb:ebe98af1
ARRAY /dev/md/Volume0 container=b67ea029:aaea7da2:2540c1eb:ebe98af1
member=0 UUID=51a415ba:dc9c8cd7:5b3ea8de:465b4630

My first concern is the warning that the HBA is missing, the whole
reason I am going at it this way is because I don't have the HBA.
Second concern is duplicate detection of the same array.

If i try to run # mdadm -As:
mdadm: No arrays found in config file or automatically

  I also tried adding the output from --examine --scan to
/etc/mdadm/mdadm.conf but after trying that I now get blank output:

# mdadm --assemble /dev/md/Volume0
#
# mdadm --assemble --scan
#

full examine of all disks involved:

/dev/sdb:
           Magic : Intel Raid ISM Cfg Sig.
         Version : 1.3.00
     Orig Family : 226cc5df
          Family : 226cc5df
      Generation : 000019dc
      Attributes : All supported
            UUID : b67ea029:aaea7da2:2540c1eb:ebe98af1
        Checksum : 651263bf correct
     MPB Sectors : 2
           Disks : 4
    RAID Devices : 1

   Disk02 Serial : Z1E1RPA9
           State : active
              Id : 00030000
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

[Volume0]:
            UUID : 51a415ba:dc9c8cd7:5b3ea8de:465b4630
      RAID Level : 5
         Members : 4
           Slots : [__U_]
     Failed disk : 0
       This Slot : 2
      Array Size : 11721072640 (5589.04 GiB 6001.19 GB)
    Per Dev Size : 3907024648 (1863.01 GiB 2000.40 GB)
   Sector Offset : 0
     Num Stripes : 15261814
      Chunk Size : 128 KiB
        Reserved : 0
   Migrate State : idle
       Map State : failed
     Dirty State : clean

   Disk00 Serial : Z1E1AKPH:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

   Disk01 Serial : Z24091Q5:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

   Disk03 Serial : Z1E19E4K:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)
/dev/sdc:
    MBR Magic : aa55
Partition[0] :   3907027057 sectors at           63 (type 42)
/dev/sdd:
           Magic : Intel Raid ISM Cfg Sig.
         Version : 1.3.00
     Orig Family : 226cc5df
          Family : 226cc5df
      Generation : 000019d9
      Attributes : All supported
            UUID : b67ea029:aaea7da2:2540c1eb:ebe98af1
        Checksum : 641438ba correct
     MPB Sectors : 2
           Disks : 4
    RAID Devices : 1

   Disk03 Serial : Z1E19E4K
           State : active
              Id : 00020000
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

[Volume0]:
            UUID : 51a415ba:dc9c8cd7:5b3ea8de:465b4630
      RAID Level : 5
         Members : 4
           Slots : [__UU]
     Failed disk : 0
       This Slot : 3
      Array Size : 11721072640 (5589.04 GiB 6001.19 GB)
    Per Dev Size : 3907024648 (1863.01 GiB 2000.40 GB)
   Sector Offset : 0
     Num Stripes : 15261814
      Chunk Size : 128 KiB
        Reserved : 0
   Migrate State : idle
       Map State : failed
     Dirty State : clean

   Disk00 Serial : Z1E1AKPH:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

   Disk01 Serial : Z24091Q5:0
           State : active
              Id : ffffffff
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)

   Disk02 Serial : Z1E1RPA9
           State : active
              Id : 00030000
     Usable Size : 3907024648 (1863.01 GiB 2000.40 GB)
/dev/sde:
    MBR Magic : aa55
Partition[0] :   4294967295 sectors at            1 (type ee)

# dpkg -l | grep mdadm
ii  mdadm                                                       3.2.5-1+b1

thanks
chris
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