[Bug 701351] Re: grub-install fails to install on a raid1 array

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: grub2 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/701351

Title:
  grub-install fails to install on a raid1 array

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: grub2

  This bug is very similar to https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/527401 but different with a twist: I'm running mdraid version 1.0, whereas the above bug explicitly states that the fix is for version 0.9.
  To recap:

  # lsb_release -rd
  Description:	Ubuntu 10.04.1 LTS
  Release:	10.04

  # apt-cache policy grub2
  grub2:
    Installed: 1.98-1ubuntu9
    Candidate: 1.98-1ubuntu9
    Version table:
   *** 1.98-1ubuntu9 0
          500 http://us.archive.ubuntu.com/ubuntu/ lucid-updates/universe Packages
          100 /var/lib/dpkg/status
       1.98-1ubuntu5 0
          500 http://us.archive.ubuntu.com/ubuntu/ lucid/universe Packages

  
  # grub-install --recheck --modules="mdraid raid" /dev/md1
  /usr/sbin/grub-probe: error: no mapping exists for `md1'.
  /usr/sbin/grub-probe: error: no mapping exists for `md1'.
  /usr/sbin/grub-setup: error: no mapping exists for `md1'.

  # grub-probe -t fs /boot
  grub-probe: error: no mapping exists for `md1'.

  # grub-install -v 
  grub-install (GNU GRUB 1.98-1ubuntu9)

  # cat /proc/mdstat

  md1 : active raid1 sdc1[3] sda1[0]
        530100 blocks super 1.0 [3/2] [UU_]

  NOTE: "super 1.0" above means this is mdraid version 1.0, not 0.9

  Comments in bug 527401 (specifically comment 9) suggests that perhaps
  grub does not (yet?) support raid versions 1.0, 1.1 or 1.2

  The upshot is that I'm unable to write the MBR and install grub on
  either /dev/sda, /dev/sdb or /dev/sdc :-(

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