[Bug 999076] Re: mdadm 0.9 metadata at the end of the disk confuses grub

Phillip Susi psusi at ubuntu.com
Wed May 16 18:54:20 UTC 2012 

** Summary changed:

- Upgrade vom 10.04 LTS Server to 12.04 LTS Server breaks grub
+ mdadm 0.9 metadata at the end of the disk confuses grub

** Changed in: grub2 (Ubuntu)
       Status: Incomplete => Triaged

** Changed in: grub2 (Ubuntu)
   Importance: Undecided => High

** Description changed:

- I tried to upgrade a server, and i was left with a broken grub2. I think
- it has to do something with LVM/RAID.
+ When using mdadm metadata format 0.9 and the partition is at the end of
+ the disk, grub can not tell whether it is the partition or the whole
+ disk that is the raid component, resulting in errors like:
  
- My setup: /root lies on LVM which is on a Raid5. There's not separate
- boot partition.
- 
- When i reinstall grub2 from the command-line i get the following errors:
- 
- ...
- 
- Setting up grub-pc (1.99-21ubuntu3) ...
- 
- Creating config file /etc/default/grub with new version
  error: found two disks with the index 0 for RAID md0.
  error: found two disks with the index 3 for RAID md0.
  error: superfluous RAID member (4 found).
  error: superfluous RAID member (4 found).
  error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.                                                                                                                                                                              
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- /usr/sbin/grub-probe: error: unknown filesystem.
- Auto-detection of a filesystem of /dev/mapper/lvm-root failed.
  
- Try with --recheck.
- If the problem persists 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>
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- /usr/sbin/grub-probe: error: unknown filesystem.
- Auto-detection of a filesystem of /dev/mapper/lvm-root failed.
- Try with --recheck.
- If the problem persists 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>
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- /usr/sbin/grub-probe: error: unknown filesystem.
- Auto-detection of a filesystem of /dev/mapper/lvm-root failed.
- Try with --recheck.
- If the problem persists 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>
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- /usr/sbin/grub-probe: error: unknown filesystem.
- Auto-detection of a filesystem of /dev/mapper/lvm-root failed.
- Try with --recheck.
- If the problem persists 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>
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: found two disks with the index 0 for RAID md0.
- error: found two disks with the index 3 for RAID md0.
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- error: superfluous RAID member (4 found).
- /usr/sbin/grub-probe: error: unknown filesystem.
- Auto-detection of a filesystem of /dev/mapper/lvm-root failed.
- Try with --recheck.
- If the problem persists 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>
+ This can cause unexpected failure after upgrading from 10.04.

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https://bugs.launchpad.net/bugs/999076

Title:
  mdadm 0.9 metadata at the end of the disk confuses grub

Status in GRand Unified Bootloader:
  Unknown
Status in “grub2” package in Ubuntu:
  Triaged

Bug description:
  When using mdadm metadata format 0.9 and the partition is at the end
  of the disk, grub can not tell whether it is the partition or the
  whole disk that is the raid component, resulting in errors like:

  error: found two disks with the index 0 for RAID md0.
  error: found two disks with the index 3 for RAID md0.
  error: superfluous RAID member (4 found).
  error: superfluous RAID member (4 found).
  error: superfluous RAID member (4 found).

  This can cause unexpected failure after upgrading from 10.04.

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