11.04 Server only booting from 1 HDD of RAID-1

**psusi** · August 13th, 2011

Originally Posted by dharma_initiative

How shall i run the script if the machine isn`t booting up?

The same way you did before: from the livecd.

**dharma_initiative** · August 13th, 2011

I never did it that way before. i always run it ion the machine with all discs attached.
Now i did it with a live cd with booth discs attached.

Code:

                  Boot Info Script 0.60    from 17 May 2011


============================= Boot Info Summary: ===============================

 => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of 
    the same hard drive for core.img. core.img is at this location and looks 
    for (md0)/boot/grub on this drive.
 => Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of 
    the same hard drive for core.img. core.img is at this location and looks 
    for (md0)/boot/grub on this drive.
 => No boot loader is installed in the MBR of /dev/sdc.

sda1: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info:  

sda2: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info:  

sdb1: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info:  

sdb2: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info:  

sdc1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  FAT32
    Boot sector info:   According to the info in the boot sector, sdc1 starts 
                       at sector 0. But according to the info from fdisk, 
                       sdc1 starts at sector 62.
    Operating System:  
    Boot files:        

md0: ___________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:  
    Operating System:  Ubuntu 11.04
    Boot files:        /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________

Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sda1    *             63    20,971,583    20,971,521  fd Linux raid autodetect
/dev/sda2          20,971,584    27,263,040     6,291,457  fd Linux raid autodetect


Drive: sdb _____________________________________________________________________

Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdb1    *             63    20,971,583    20,971,521  fd Linux raid autodetect
/dev/sdb2          20,971,584    27,263,040     6,291,457  fd Linux raid autodetect


Drive: sdc _____________________________________________________________________

Disk /dev/sdc: 4011 MB, 4011851776 bytes
124 heads, 62 sectors/track, 1019 cylinders, total 7835648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdc1                  62     7,834,071     7,834,010  83 Linux


"blkid" output: ________________________________________________________________

Device           UUID                                   TYPE       LABEL

/dev/loop0                                              squashfs   
/dev/sda1        21e3dbe0-3924-f2f0-b64a-cd66a7075890   linux_raid_member 
/dev/sda2        e064b00f-cb16-8fdb-0ff6-1f714cc3505e   linux_raid_member 
/dev/sdb1        21e3dbe0-3924-f2f0-b64a-cd66a7075890   linux_raid_member 
/dev/sdb2        e064b00f-cb16-8fdb-0ff6-1f714cc3505e   linux_raid_member 
/dev/sdc1        391A-293F                              vfat       

================================ Mount points: =================================

Device           Mount_Point              Type       Options

/dev/loop0       /rofs                    squashfs   (ro,noatime)
/dev/sdc1        /mnt                     vfat       (rw)
/dev/sr0         /cdrom                   iso9660    (ro,noatime)


=========================== md0/boot/grub/grub.cfg: ============================

--------------------------------------------------------------------------------
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod raid
insmod mdraid09
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(md0)'
search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
fi
terminal_output gfxterm
insmod raid
insmod mdraid09
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(md0)'
search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
set locale_dir=($root)/boot/grub/locale
set lang=de_DE
insmod gettext
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=2
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
if [ ${recordfail} != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu, mit Linux 2.6.38-8-server' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    set gfxpayload=$linux_gfx_mode
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux    /boot/vmlinuz-2.6.38-8-server root=UUID=b25c1587-4645-42b7-a1cc-e64949c264dd ro   quiet
    initrd    /boot/initrd.img-2.6.38-8-server
}
menuentry 'Ubuntu, mit Linux 2.6.38-8-server (Wiederherstellungsmodus)' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    set gfxpayload=$linux_gfx_mode
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    echo    'Loading Linux 2.6.38-8-server ...'
    linux    /boot/vmlinuz-2.6.38-8-server root=UUID=b25c1587-4645-42b7-a1cc-e64949c264dd ro single 
    echo    'Loading initial ramdisk ...'
    initrd    /boot/initrd.img-2.6.38-8-server
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux16    /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux16    /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Ubuntu, with Linux 2.6.32-33-server (on /dev/sda1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sda,msdos1)'
    search --no-floppy --fs-uuid --set=root 48a39682-5c6f-4d89-a8fc-310f2ce3fd3d
    linux /boot/vmlinuz-2.6.32-33-server root=UUID=48a39682-5c6f-4d89-a8fc-310f2ce3fd3d ro quiet
    initrd /boot/initrd.img-2.6.32-33-server
}
menuentry "Ubuntu, with Linux 2.6.32-33-server (recovery mode) (on /dev/sda1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sda,msdos1)'
    search --no-floppy --fs-uuid --set=root 48a39682-5c6f-4d89-a8fc-310f2ce3fd3d
    linux /boot/vmlinuz-2.6.32-33-server root=UUID=48a39682-5c6f-4d89-a8fc-310f2ce3fd3d ro single
    initrd /boot/initrd.img-2.6.32-33-server
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /boot/vmlinuz-2.6.38-8-server root=/dev/sdb1
    initrd /boot/initrd.img-2.6.38-8-server
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
--------------------------------------------------------------------------------

================================ md0/etc/fstab: ================================

--------------------------------------------------------------------------------
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/md0 during installation
UUID=b25c1587-4645-42b7-a1cc-e64949c264dd /               ext4    errors=remount-ro 0       1
# swap was on /dev/md1 during installation
UUID=1b9e9adc-baf9-474b-94ba-d33c0f4c81b9 none            swap    sw              0       0
--------------------------------------------------------------------------------

==================== md0: Location of files loaded by Grub: ====================

           GiB - GB             File                                 Fragment(s)

   8.201728821 = 8.806539264    boot/grub/core.img                             1
   6.157077789 = 6.611111936    boot/grub/grub.cfg                             1
   1.004653931 = 1.078738944    boot/initrd.img-2.6.38-8-server                2
   0.359737396 = 0.386265088    boot/vmlinuz-2.6.38-8-server                   1
   1.004653931 = 1.078738944    initrd.img                                     2
   0.359737396 = 0.386265088    vmlinuz                                        1

=============================== StdErr Messages: ===============================

unlzma: Decoder error
unlzma: Decoder error
mdadm: /dev/md0 has been started with 2 drives.
mdadm: stopped /dev/md0

**MAFoElffen** · August 13th, 2011

"What" is the brand and model of your primary disk sda? Are you using that as SDA through all of this? (You just said that your friend had loaned you 2 disks...)

This may sound silly- but I have problems sometimes with Seagate drives and some controllers when doing RAID. Drove me batty trying to figure out what was going on the first time it happened! Found it by switching the order of the drives until it popped up as isolating the problem with that particular drive. There was nothing "really" functionally wrong with that drive (tested out fine), it just didn't like doing RAID in that particular setup. That same drive works fine in another box.

I know it's a long shot- or so I thought it was at the time also.

**dharma_initiative** · August 14th, 2011

I have three hard discs 2x Seagate ST32000542AS and one Hitachi.
On this three discs on the same hardware, Ubuntu 10.10 Server is running without any problem.

For testing purposes it borrowed 2 x Hitachi HDS722020ALA330.
With that discs 10.10 is working fine too but 11.04 not.

If i remove one disc of the raid set the system will permanently reboot.

Here is the output of the Bootinfoscript when i run it via a live cd environment with the first HDD removed. The System is NOT booting up.

Code:

                  Boot Info Script 0.60    from 17 May 2011


============================= Boot Info Summary: ===============================

 => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of 
    the same hard drive for core.img. core.img is at this location and looks 
    for (md0)/boot/grub on this drive.
 => No boot loader is installed in the MBR of /dev/sdb.

sda1: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info:  

sda2: __________________________________________________________________________

    File system:       linux_raid_member
    Boot sector type:  -
    Boot sector info:  

sdb1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  FAT32
    Boot sector info:   According to the info in the boot sector, sdb1 starts 
                       at sector 0. But according to the info from fdisk, 
                       sdb1 starts at sector 62.
    Operating System:  
    Boot files:        

md/0_0: ________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:  
    Operating System:  Ubuntu 11.04
    Boot files:        /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________

Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sda1    *             63    20,971,583    20,971,521  fd Linux raid autodetect
/dev/sda2          20,971,584    27,263,040     6,291,457  fd Linux raid autodetect


Drive: sdb _____________________________________________________________________

Disk /dev/sdb: 4011 MB, 4011851776 bytes
124 heads, 62 sectors/track, 1019 cylinders, total 7835648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdb1                  62     7,834,071     7,834,010  83 Linux


"blkid" output: ________________________________________________________________

Device           UUID                                   TYPE       LABEL

/dev/loop0                                              squashfs   
/dev/md127       b25c1587-4645-42b7-a1cc-e64949c264dd   ext4       
/dev/sda1        21e3dbe0-3924-f2f0-b64a-cd66a7075890   linux_raid_member 
/dev/sda2        e064b00f-cb16-8fdb-0ff6-1f714cc3505e   linux_raid_member 
/dev/sdb1        391A-293F                              vfat       

================================ Mount points: =================================

Device           Mount_Point              Type       Options

/dev/loop0       /rofs                    squashfs   (ro,noatime)
/dev/sdb1        /mnt                     vfat       (rw)
/dev/sr0         /cdrom                   iso9660    (ro,noatime)


========================== md/0_0/boot/grub/grub.cfg: ==========================

--------------------------------------------------------------------------------
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod raid
insmod mdraid09
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(md0)'
search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
fi
terminal_output gfxterm
insmod raid
insmod mdraid09
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(md0)'
search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
set locale_dir=($root)/boot/grub/locale
set lang=de_DE
insmod gettext
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=2
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
if [ ${recordfail} != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu, mit Linux 2.6.38-8-server' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    set gfxpayload=$linux_gfx_mode
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux    /boot/vmlinuz-2.6.38-8-server root=UUID=b25c1587-4645-42b7-a1cc-e64949c264dd ro   quiet
    initrd    /boot/initrd.img-2.6.38-8-server
}
menuentry 'Ubuntu, mit Linux 2.6.38-8-server (Wiederherstellungsmodus)' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    set gfxpayload=$linux_gfx_mode
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    echo    'Loading Linux 2.6.38-8-server ...'
    linux    /boot/vmlinuz-2.6.38-8-server root=UUID=b25c1587-4645-42b7-a1cc-e64949c264dd ro single 
    echo    'Loading initial ramdisk ...'
    initrd    /boot/initrd.img-2.6.38-8-server
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux16    /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod raid
    insmod mdraid09
    insmod part_msdos
    insmod part_msdos
    insmod ext2
    set root='(md0)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux16    /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Ubuntu, with Linux 2.6.32-33-server (on /dev/sda1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sda,msdos1)'
    search --no-floppy --fs-uuid --set=root 48a39682-5c6f-4d89-a8fc-310f2ce3fd3d
    linux /boot/vmlinuz-2.6.32-33-server root=UUID=48a39682-5c6f-4d89-a8fc-310f2ce3fd3d ro quiet
    initrd /boot/initrd.img-2.6.32-33-server
}
menuentry "Ubuntu, with Linux 2.6.32-33-server (recovery mode) (on /dev/sda1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sda,msdos1)'
    search --no-floppy --fs-uuid --set=root 48a39682-5c6f-4d89-a8fc-310f2ce3fd3d
    linux /boot/vmlinuz-2.6.32-33-server root=UUID=48a39682-5c6f-4d89-a8fc-310f2ce3fd3d ro single
    initrd /boot/initrd.img-2.6.32-33-server
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /boot/vmlinuz-2.6.38-8-server root=/dev/sdb1
    initrd /boot/initrd.img-2.6.38-8-server
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
menuentry "Ubuntu 11.04 (11.04) (on /dev/sdb1)" --class gnu-linux --class gnu --class os {
    insmod part_msdos
    insmod ext2
    set root='(/dev/sdb,msdos1)'
    search --no-floppy --fs-uuid --set=root b25c1587-4645-42b7-a1cc-e64949c264dd
    linux /vmlinuz root=/dev/sdb1
    initrd /initrd.img
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
--------------------------------------------------------------------------------

============================== md/0_0/etc/fstab: ===============================

--------------------------------------------------------------------------------
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/md0 during installation
UUID=b25c1587-4645-42b7-a1cc-e64949c264dd /               ext4    errors=remount-ro 0       1
# swap was on /dev/md1 during installation
UUID=1b9e9adc-baf9-474b-94ba-d33c0f4c81b9 none            swap    sw              0       0
--------------------------------------------------------------------------------

================== md/0_0: Location of files loaded by Grub: ===================

           GiB - GB             File                                 Fragment(s)

   8.201728821 = 8.806539264    boot/grub/core.img                             1
   6.157077789 = 6.611111936    boot/grub/grub.cfg                             1
   1.004653931 = 1.078738944    boot/initrd.img-2.6.38-8-server                2
   0.359737396 = 0.386265088    boot/vmlinuz-2.6.38-8-server                   1
   1.004653931 = 1.078738944    initrd.img                                     2
   0.359737396 = 0.386265088    vmlinuz                                        1

=============================== StdErr Messages: ===============================

unlzma: Decoder error

**YesWeCan** · August 14th, 2011

I think I see. The mdadm version is different between 10.10 and 11.04. Would you add the missing drive back, boot and post the contents of your /etc/mdadm/mdadm.conf
Also cat /proc/mdstat
and sudo mdadm -Es

**dharma_initiative** · August 14th, 2011

mdadm.conf

Code:

# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#

# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
DEVICE partitions

# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes

# automatically tag new arrays as belonging to the local system
HOMEHOST <system>

# instruct the monitoring daemon where to send mail alerts
MAILADDR root

# definitions of existing MD arrays
ARRAY /dev/md0 UUID=21e3dbe0:3924f2f0:b64acd66:a7075890
ARRAY /dev/md1 UUID=e064b00f:cb168fdb:0ff61f71:4cc3505e

# This file was auto-generated on Sat, 13 Aug 2011 16:48:15 +0200
# by mkconf $Id$

cat /proc/mdstat

Code:

Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md1 : active raid1 sda2[1] sdb2[0]
      3145664 blocks [2/2] [UU]
      
md0 : active raid1 sda1[1] sdb1[0]
      10485696 blocks [2/2] [UU]
      
unused devices: <none>

mdadm -Es

Code:

ARRAY /dev/md0 UUID=21e3dbe0:3924f2f0:b64acd66:a7075890
ARRAY /dev/md1 UUID=e064b00f:cb168fdb:0ff61f71:4cc3505e

**YesWeCan** · August 14th, 2011

They look perfect. Try
sudo update-initramfs -u
to make sure the madam.conf info is available to the kernel during boot.
and
sudo update-grub
sudo grub-install /dev/sda
sudo grub-install /dev/sdb
for good measure.

**dharma_initiative** · August 14th, 2011

Same error

**YesWeCan** · August 14th, 2011

Why is it that mdstat does not show a metadata version and mdadm -Es doesn't show one either?
With metadata 1.2 that 11.04 uses by default, we should see the metadata version and the name of the array shown.
sudo mdadm -D /dev/md0
mdadm -V

Also, it would be useful to always see the Grub menu if Grub runs. Annoyingly, Ubuntu defaults to not showing it. In /etc/default/grub add a # before the GRUB_HIDDEN_TIMEOUT=0 line and then run sudo update-grub.

I seem to have reproduced something similar in VirtualBox. The symptom is slightly different, I end up with a blank screen when either disk is disconnected.

**dharma_initiative** · August 14th, 2011

I`ve already activatd the showing of the grub boot menu and it`s shown.
But when the PC reboots (because of the missing disc) ther is no grub menu.

mdadm -D /dev/mdo

Code:

/dev/md0:
        Version : 0.90
  Creation Time : Fri Aug 12 18:52:23 2011
     Raid Level : raid1
     Array Size : 10485696 (10.00 GiB 10.74 GB)
  Used Dev Size : 10485696 (10.00 GiB 10.74 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sun Aug 14 17:15:03 2011
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 21e3dbe0:3924f2f0:b64acd66:a7075890
         Events : 0.1072

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8        1        1      active sync   /dev/sda1

mdadm -V

Code:

mdadm - v3.1.4 - 31 August 2010

Thread: 11.04 Server only booting from 1 HDD of RAID-1

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