Public bug reported:

Binary package hint: mdadm

I've had this problem happen a few times in the past with previous versions of 
Ubuntu. (I'm now on Lucid) I forget how I got rid of it then. What happened now 
is a just added a couple of eSATA disks (/dev/sdd and /dev/sde) (they function 
like regular SATA disks.) I had setup my /dev/md0 array from /dev/sdb and 
/dev/sdc months ago. Now all of a sudden it fabricates a /dev/md_d0 array 
somehow (based on /dev/md0p1) and the system fails to mount /dev/md0p1. This is 
the output from cat /proc/mdstat:
m...@hegemon:~$ cat /proc/mdstat
Personalities : [linear] [raid1] [multipath] [raid0] [raid6] [raid5] [raid4] 
[raid10] 
md_d0 : inactive md0p1[1](S)
      245111616 blocks
       
md0 : active raid1 sdc[1] sdb[0]
      245117312 blocks [2/2] [UU]
      
unused devices: <none>
My workaround for now is to manually remove /md_d0 every time I reboot the 
system as follows:
m...@hegemon:~$ sudo mdadm --manage --stop /dev/md_d0
mdadm: stopped /dev/md_d0
I can then run mount -a and it successfully mounts /dev/md0p1
I get this output after deleting the array, I believe it is the same as before 
I delete it:
m...@hegemon:~$ sudo ls /dev/md*
/dev/md0    /dev/md_d0    /dev/md_d0p2  /dev/md_d0p4
/dev/md0p1  /dev/md_d0p1  /dev/md_d0p3

/dev/md:
d0  d0p1  d0p2  d0p3  d0p4

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: mdadm 2.6.7.1-1ubuntu15
ProcVersionSignature: Ubuntu 2.6.32-24.39-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
Architecture: amd64
Date: Sun Aug  8 21:05:33 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MDadmExamine.dev.sda: Error: command ['/sbin/mdadm', '-E', '/dev/sda'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sda.
MDadmExamine.dev.sda1: Error: command ['/sbin/mdadm', '-E', '/dev/sda1'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sda1.
MDadmExamine.dev.sda2: Error: command ['/sbin/mdadm', '-E', '/dev/sda2'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sda2.
MDadmExamine.dev.sda3: Error: command ['/sbin/mdadm', '-E', '/dev/sda3'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sda3.
MDadmExamine.dev.sda5: Error: command ['/sbin/mdadm', '-E', '/dev/sda5'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sda5.
MDadmExamine.dev.sdd: Error: command ['/sbin/mdadm', '-E', '/dev/sdd'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sdd.
MDadmExamine.dev.sdd1: Error: command ['/sbin/mdadm', '-E', '/dev/sdd1'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sdd1.
MDadmExamine.dev.sde: Error: command ['/sbin/mdadm', '-E', '/dev/sde'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sde.
MDadmExamine.dev.sde1: Error: command ['/sbin/mdadm', '-E', '/dev/sde1'] failed 
with exit code 1: mdadm: No md superblock detected on /dev/sde1.
MachineType: Gigabyte Technology Co., Ltd. 965P-S3
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic 
root=UUID=6a13dd7d-05c7-4f03-af14-031d3821217b ro quiet splash
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcMDstat:
 Personalities : [linear] [raid1] [multipath] [raid0] [raid6] [raid5] [raid4] 
[raid10] 
 md0 : active raid1 sdc[1] sdb[0]
       245117312 blocks [2/2] [UU]
       
 unused devices: <none>
SourcePackage: mdadm
dmi.bios.date: 06/25/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F14
dmi.board.name: 965P-S3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF14:bd06/25/2009:svnGigabyteTechnologyCo.,Ltd.:pn965P-S3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rn965P-S3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: 965P-S3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'

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


** Tags: amd64 apport-bug lucid mdadm raid

-- 
md_d0 array fabricated, prevents mounting md0 partitions
https://bugs.launchpad.net/bugs/615186
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