[Bug 797174] Re: Ubuntu 10.10 2.6.35-28 kernel does not assemble md devices correctly.

[Sheldon Lee-Wen]

I managed to fix the issue by doing the following with each disk: (I use X here to represent the disk.)
mdadm --manage /dev/md0 --fail /dev/sdX1
mdadm --manage /dev/md0 --remove /dev/sdX1
mdadm --zero-superblock /dev/sdX
mdadm --zero-superblock /dev/sdX1
dd if=/dev/zero of=/dev/sdX bs=1 count=2048
fdisk /dev/sdX (recreated the first partition and mbr on each disk and ensure type set to fd)
mdadm --manage /dev/md0 -a /dev/sdX
(Allow the array to resync to 100% before doing the next disk. Each resync took a few hours.)

Once I had done this for all of the disks in the array I rebooted to the
latest kernel 2.6.35-28-generic-pae. On the first boot I still had the
same problem so I stopped the array with mdadm --manage --stop /dev/md0
and made the following changes to /etc/mdadm/mdadm.conf

DEVICE /dev/sda /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg /dev/sdc1
ARRAY /dev/md0 level=raid5 num-devices=3 UUID=726e3b03:242ebdf0:85c68096:6992ccf3 

I then restarted the array with:
mdadm --assemble -c /etc/mdadm/mdadm.conf /dev/md0

Then I updated all of the initramfs modules:
update-initramfs -k all -u

When I rebooted my array came online automatically without errors.

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Title:
  Ubuntu 10.10 2.6.35-28 kernel does not assemble md devices correctly.

Status in “mdadm” package in Ubuntu:
  New

Bug description:
  Binary package hint: mdadm

  I'm on Ubuntu 10.10, when I tried to boot with the 2.6.35-28 kernel,
  for some reason on boot md tries to assemble my devices incorrectly,
  using the whole devices rather than the partitions. The software raid
  device starts, but then LVM cannot find the disk group.

  e.g. Here is the output from dmesg on the 2.6.35-27 kernel, which does
  work properly:

  md/raid:md0: device sdf1 operational as raid disk 1
  md/raid:md0: device sde1 operational as raid disk 0
  md/raid:md0: device sdd1 operational as raid disk 2
  md/raid:md0: allocated 3179kB
  md/raid:md0: raid level 5 active with 3 out of 3 devices, algorithm 2
  RAID conf printout:
  --- level:5 rd:3 wd:3
  disk 0, o:1, dev:sde1
  disk 1, o:1, dev:sdf1
  disk 2, o:1, dev:sdd1
  md0: detected capacity change from 0 to 2000407494656
  md0: unknown partition table

  Here is the output form 2.6.35-28 which does not work properly:

  md/raid:md0: device sdd operational as raid disk 2
  md/raid:md0: device sdf operational as raid disk 1
  md/raid:md0: device sde operational as raid disk 0
  md/raid:md0: allocated 3179kB
  md/raid:md0: raid level 5 active with 3 out of 3 devices, algorithm 2
  RAID conf printout:
  --- level:5 rd:3 wd:3
  disk 0, o:1, dev:sde
  disk 1, o:1, dev:sdf
  disk 2, o:1, dev:sdd
  md0: detected capacity change from 0 to 2000407494656
  md0: p1

  My md0 device should not have a p1 partition on it!

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: mdadm 2.6.7.1-1ubuntu16
  ProcVersionSignature: Ubuntu 2.6.35-27.48-generic-pae 2.6.35.11
  Uname: Linux 2.6.35-27-generic-pae i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Tue Jun 14 09:07:35 2011
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MDadmExamine.dev.sdb:
   Error: command ['/sbin/mdadm', '-E', '/dev/sdb'] failed with exit code 1: mdadm: metadata format 00.90 unknown, ignored.
   mdadm: metadata format 00.90 unknown, ignored.
   mdadm: No md superblock detected on /dev/sdb.
  MDadmExamine.dev.sdb1:
   Error: command ['/sbin/mdadm', '-E', '/dev/sdb1'] failed with exit code 1: mdadm: metadata format 00.90 unknown, ignored.
   mdadm: metadata format 00.90 unknown, ignored.
   mdadm: No md superblock detected on /dev/sdb1.
  MDadmExamine.dev.sdb2:
   Error: command ['/sbin/mdadm', '-E', '/dev/sdb2'] failed with exit code 1: mdadm: metadata format 00.90 unknown, ignored.
   mdadm: metadata format 00.90 unknown, ignored.
   mdadm: No md superblock detected on /dev/sdb2.
  MDadmExamine.dev.sdb5:
   Error: command ['/sbin/mdadm', '-E', '/dev/sdb5'] failed with exit code 1: mdadm: metadata format 00.90 unknown, ignored.
   mdadm: metadata format 00.90 unknown, ignored.
   mdadm: No md superblock detected on /dev/sdb5.
  MDadmExamine.dev.sdb6:
   Error: command ['/sbin/mdadm', '-E', '/dev/sdb6'] failed with exit code 1: mdadm: metadata format 00.90 unknown, ignored.
   mdadm: metadata format 00.90 unknown, ignored.
   mdadm: No md superblock detected on /dev/sdb6.
  MDadmExamine.dev.sdb7:
   Error: command ['/sbin/mdadm', '-E', '/dev/sdb7'] failed with exit code 1: mdadm: metadata format 00.90 unknown, ignored.
   mdadm: metadata format 00.90 unknown, ignored.
   mdadm: No md superblock detected on /dev/sdb7.
  MachineType: System manufacturer P5K-E
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-27-generic-pae root=UUID=ded4ad54-93bf-4849-99b3-096269bba553 ro crashkernel=384M-2G:64M,2G-:128M quiet splash nomodeset video=uvesafb:mode_option=1920x1200-24,mtrr=3,scroll=ywrap vmalloc=192M
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_CA.utf8
   SHELL=/bin/bash
  SourcePackage: mdadm
  dmi.bios.date: 10/31/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0806
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P5K-E
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0806:bd10/31/2007:svnSystemmanufacturer:pnP5K-E:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5K-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: P5K-E
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'

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