[Bug 681535] Re: Auto-detection of a filesystem of /dev/md0 failed.

[Sebastian Nickel]

It seems that the problem is when using big partitions and GPT. If I
reduce my partition sizes and use a normal dos partition style grub
installs without problems. When using GPT the error occures. I use a 1MB
boot_grub partition for embedding the grub bootfiles. I use the
following scheme (for example):

"""
$> parted /dev/sda print       
Disk /dev/sda: 3001GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 4      1049kB  3146kB  2097kB                     bios_grub
 1      3146kB  2151MB  2147MB                     raid
 2      2152MB  2688MB  536MB                      raid
 3      2689MB  45.6GB  42.9GB                     raid
"""

Does grub-2 from ubuntu not support GPT partition style?

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https://bugs.launchpad.net/bugs/681535

Title:
  Auto-detection of a filesystem of /dev/md0 failed.

Status in “grub2” package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: grub2

  Setting up grub-pc (1.99~20101124-1ubuntu1) ...
  /usr/sbin/grub-probe: error: no such disk.
  Auto-detection of a filesystem of /dev/md0 failed.
  Please report this together with the output of "/usr/sbin/grub-probe --device-map="/boot/grub/device.map" --target=fs -v /boot/grub" to <bug-grub at gnu.org>
  /usr/sbin/grub-probe: error: no such disk.

  > sudo /usr/sbin/grub-probe --device-map="/boot/grub/device.map" --target=fs -v /boot/grub
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: scanning hd0 for LVM.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: no LVM signature found
  .
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: scanning hd1 for LVM.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: no LVM signature found
  .
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: scanning hd2 for LVM.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: no LVM signature found
  .
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: changing current directory to /dev.
  /usr/sbin/grub-probe: info: changing current directory to snd.
  /usr/sbin/grub-probe: info: changing current directory to by-path.
  /usr/sbin/grub-probe: info: changing current directory to cpu.
  /usr/sbin/grub-probe: info: changing current directory to shm.
  /usr/sbin/grub-probe: info: changing current directory to dri.
  /usr/sbin/grub-probe: info: opening md0.
  /usr/sbin/grub-probe: error: no such disk.

  with grub 1.98+20100804-7ubuntu1:

  > sudo /usr/sbin/grub-probe --device-map="/boot/grub/device.map" --target=fs -v /boot/grub
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd0 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: the size of hd2 is 781422768.
  /usr/sbin/grub-probe: info: changing current directory to /dev.
  /usr/sbin/grub-probe: info: changing current directory to snd.
  /usr/sbin/grub-probe: info: changing current directory to by-path.
  /usr/sbin/grub-probe: info: changing current directory to cpu.
  /usr/sbin/grub-probe: info: changing current directory to shm.
  /usr/sbin/grub-probe: info: changing current directory to dri.
  /usr/sbin/grub-probe: info: opening md0.
  ext2

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