[Bug 943397] Re: cannot re-add a briefly disconnected disk to a RAID1 set

[Clint Byrum]

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https://bugs.launchpad.net/bugs/943397

Title:
  cannot re-add a briefly disconnected disk to a RAID1 set

Status in “mdadm” package in Ubuntu:
  New

Bug description:
  While performing the RAID 1 tests for beta1 candidates:

  http://testcases.qa.ubuntu.com/Install/ServerRAID1

  I was unable to complete the first step where mdadm --add is used.

  $ sudo mdadm --add /dev/md0 /dev/vdb1
  mdadm: /dev/vdb1 reports being an active member for /dev/md0, but a --re-add fails.
  mdadm: not performing --add as that would convert /dev/vdb1 in to a spare.
  mdadm: To make this a spare, use "mdadm --zero-superblock /dev/vdb1" first.

  
  $ cat /proc/mdstat
  Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
  md1 : active raid1 vdb5[1] vda5[0]
        96244 blocks super 1.2 [2/2] [UU]
        
  md2 : active raid1 vda6[0]
        425972 blocks super 1.2 [2/1] [U_]
        
  md0 : active raid1 vda1[0]
        1569780 blocks super 1.2 [2/1] [U_]
        

  ubuntu at p-b1-32:~$ sudo mdadm --examine /dev/vdb1
  /dev/vdb1:
            Magic : a92b4efc
          Version : 1.2
      Feature Map : 0x0
       Array UUID : 9595b615:a4ab22b6:f400061f:da929b66
             Name : p-b1-32:0  (local to host p-b1-32)
    Creation Time : Tue Feb 28 15:29:49 2012
       Raid Level : raid1
     Raid Devices : 2

   Avail Dev Size : 3139584 (1533.26 MiB 1607.47 MB)
       Array Size : 3139560 (1533.25 MiB 1607.45 MB)
    Used Dev Size : 3139560 (1533.25 MiB 1607.45 MB)
      Data Offset : 2048 sectors
     Super Offset : 8 sectors
            State : clean
      Device UUID : c2fa7f2d:9ebed3bb:ea008191:65b60cf5

      Update Time : Tue Feb 28 16:37:57 2012
         Checksum : 7458a521 - correct
           Events : 21

  
     Device Role : Active device 1
     Array State : AA ('A' == active, '.' == missing)
  ubuntu at p-b1-32:~$ sudo mdadm --examine /dev/vda1
  /dev/vda1:
            Magic : a92b4efc
          Version : 1.2
      Feature Map : 0x0
       Array UUID : 9595b615:a4ab22b6:f400061f:da929b66
             Name : p-b1-32:0  (local to host p-b1-32)
    Creation Time : Tue Feb 28 15:29:49 2012
       Raid Level : raid1
     Raid Devices : 2

   Avail Dev Size : 3139584 (1533.26 MiB 1607.47 MB)
       Array Size : 3139560 (1533.25 MiB 1607.45 MB)
    Used Dev Size : 3139560 (1533.25 MiB 1607.45 MB)
      Data Offset : 2048 sectors
     Super Offset : 8 sectors
            State : clean
      Device UUID : 2c994b1e:79bdac7b:635987fe:0f80e387

      Update Time : Tue Feb 28 17:11:58 2012
         Checksum : 24d76cfe - correct
           Events : 145

  
     Device Role : Active device 0
     Array State : A. ('A' == active, '.' == missing)

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: mdadm 3.2.3-2ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-17.27-generic-pae 3.2.6
  Uname: Linux 3.2.0-17-generic-pae i686
  ApportVersion: 1.93-0ubuntu2
  Architecture: i386
  Date: Wed Feb 29 08:47:37 2012
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Beta i386 (20120228.1)
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Bochs Bochs
  ProcEnviron:
   TERM=xterm
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic-pae root=UUID=26ca1d0e-4569-49f5-bb18-5eefb72fccbf ro
  SourcePackage: mdadm
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/01/2007
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs
  etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'

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