[Bug 1164008] [NEW] mdadm devices not recognized correctly at boot

Austin Brashear alloy45224 at gmail.com
Wed Apr 3 16:05:30 UTC 2013 

Public bug reported:

I just upgraded a working 10.04 LTS server to 12.04 LTS. The server has
two non-boot drives in a software RAID1 configuration. This array worked
fine in 10.04 LTS.

When the machine boots I should get one active array, /dev/md0
consisting of /dev/sdb1 and /dev/sdc1. Instead, I get dumped to a
busybox session and after quitting that and booting I get two inactive
arrays: md0 (consisting of /dev/sdc1 as spare) and md127 (consisting of
/dev/sdb as spare). If I run mdadm --detail /dev/md0 or mdadm --detail
/dev/md127 I get that the device does not appear to be active.

Once I've finished booting, I can assemble my array manually by running
mdadm --stop /dev/md0 and mdadm --stop /dev/md127 and then assembling
the array with mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1.

Below are the results of some troubleshooting:
$ lsb_release -rd
Description:    Ubuntu 12.04.2 LTS
Release:        12.04


$ apt-cache policy mdadm
mdadm:
  Installed: 3.2.5-1ubuntu0.2
  Candidate: 3.2.5-1ubuntu0.2
  Version table:
 *** 3.2.5-1ubuntu0.2 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.2.3-2ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages


$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : inactive sdc1[1](S)
      1953513408 blocks

md127 : inactive sdb[2](S)
      1953514496 blocks

unused devices: <none>


$ mdadm --examine /dev/sdb1
/dev/sdb1:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : a4176cee:096f0ba6:40663db4:2b8b6d2c
  Creation Time : Thu Jul  7 09:32:01 2011
     Raid Level : raid1
  Used Dev Size : 1953513408 (1863.02 GiB 2000.40 GB)
     Array Size : 1953513408 (1863.02 GiB 2000.40 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Wed Apr  3 10:32:36 2013
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : d685ab7e - correct
         Events : 722


      Number   Major   Minor   RaidDevice State
this     0       8       17        0      active sync   /dev/sdb1

   0     0       8       17        0      active sync   /dev/sdb1
   1     1       8       33        1      active sync   /dev/sdc1


$ mdadm --examine /dev/sdc1
/dev/sdc1:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : a4176cee:096f0ba6:40663db4:2b8b6d2c
  Creation Time : Thu Jul  7 09:32:01 2011
     Raid Level : raid1
  Used Dev Size : 1953513408 (1863.02 GiB 2000.40 GB)
     Array Size : 1953513408 (1863.02 GiB 2000.40 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Wed Apr  3 10:32:36 2013
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : d685ab90 - correct
         Events : 722


      Number   Major   Minor   RaidDevice State
this     1       8       33        1      active sync   /dev/sdc1

   0     0       8       17        0      active sync   /dev/sdb1
   1     1       8       33        1      active sync   /dev/sdc1

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1164008

Title:
  mdadm devices not recognized correctly at boot

Status in “mdadm” package in Ubuntu:
  New

Bug description:
  I just upgraded a working 10.04 LTS server to 12.04 LTS. The server
  has two non-boot drives in a software RAID1 configuration. This array
  worked fine in 10.04 LTS.

  When the machine boots I should get one active array, /dev/md0
  consisting of /dev/sdb1 and /dev/sdc1. Instead, I get dumped to a
  busybox session and after quitting that and booting I get two inactive
  arrays: md0 (consisting of /dev/sdc1 as spare) and md127 (consisting
  of /dev/sdb as spare). If I run mdadm --detail /dev/md0 or mdadm
  --detail /dev/md127 I get that the device does not appear to be
  active.

  Once I've finished booting, I can assemble my array manually by
  running mdadm --stop /dev/md0 and mdadm --stop /dev/md127 and then
  assembling the array with mdadm --assemble /dev/md0 /dev/sdb1
  /dev/sdc1.

  Below are the results of some troubleshooting:
  $ lsb_release -rd
  Description:    Ubuntu 12.04.2 LTS
  Release:        12.04


  $ apt-cache policy mdadm
  mdadm:
    Installed: 3.2.5-1ubuntu0.2
    Candidate: 3.2.5-1ubuntu0.2
    Version table:
   *** 3.2.5-1ubuntu0.2 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       3.2.3-2ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages


  $ cat /proc/mdstat
  Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
  md0 : inactive sdc1[1](S)
        1953513408 blocks

  md127 : inactive sdb[2](S)
        1953514496 blocks

  unused devices: <none>


  $ mdadm --examine /dev/sdb1
  /dev/sdb1:
            Magic : a92b4efc
          Version : 0.90.00
             UUID : a4176cee:096f0ba6:40663db4:2b8b6d2c
    Creation Time : Thu Jul  7 09:32:01 2011
       Raid Level : raid1
    Used Dev Size : 1953513408 (1863.02 GiB 2000.40 GB)
       Array Size : 1953513408 (1863.02 GiB 2000.40 GB)
     Raid Devices : 2
    Total Devices : 2
  Preferred Minor : 0

      Update Time : Wed Apr  3 10:32:36 2013
            State : clean
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0
         Checksum : d685ab7e - correct
           Events : 722

  
        Number   Major   Minor   RaidDevice State
  this     0       8       17        0      active sync   /dev/sdb1

     0     0       8       17        0      active sync   /dev/sdb1
     1     1       8       33        1      active sync   /dev/sdc1


  
  $ mdadm --examine /dev/sdc1
  /dev/sdc1:
            Magic : a92b4efc
          Version : 0.90.00
             UUID : a4176cee:096f0ba6:40663db4:2b8b6d2c
    Creation Time : Thu Jul  7 09:32:01 2011
       Raid Level : raid1
    Used Dev Size : 1953513408 (1863.02 GiB 2000.40 GB)
       Array Size : 1953513408 (1863.02 GiB 2000.40 GB)
     Raid Devices : 2
    Total Devices : 2
  Preferred Minor : 0

      Update Time : Wed Apr  3 10:32:36 2013
            State : clean
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0
         Checksum : d685ab90 - correct
           Events : 722

  
        Number   Major   Minor   RaidDevice State
  this     1       8       33        1      active sync   /dev/sdc1

     0     0       8       17        0      active sync   /dev/sdb1
     1     1       8       33        1      active sync   /dev/sdc1

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