[Bug 1377826] Re: Errors while post-processing grub installation

[Phillip Susi]

Indeed, mdadm is much better supported.  FYI, you might want to use
raid10 instead of raid1.  You can get both full redundancy of raid1, and
performance comparable to raid0 that way.  You want to manually create
the array with mdadm though, and specify a chunk size of 512k to 4M, and
to use the offset layout instead of the default near layout.  My current
desktop does that across 3 cheap 1 TB WD blue drives to get both good
reliability and performance.

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Title:
  Errors while post-processing grub installation

Status in “grub2” package in Ubuntu:
  Invalid

Bug description:
  Some days ago I did a dist-upgrade on my Ubuntu 12.04 system (HP
  Microserver N54L, configured as RAID 1).  At the end of the upgrade
  process a new grub.cfg is build with the following errors displayed:

  ...
  Generating grub.cfg ...
  Found linux image: /boot/vmlinuz-3.2.0-69-generic
  Found initrd image: /boot/initrd.img-3.2.0-69-generic
  Found linux image: /boot/vmlinuz-3.2.0-67-generic
  Found initrd image: /boot/initrd.img-3.2.0-67-generic
  Found memtest86+ image: /memtest86+.bin
  ERROR: ddf1: seeking device "/dev/dm-2" to 18446744073709421056
  ERROR: hpt37x: seeking device "/dev/dm-2" to 4608
  ERROR: hpt45x: seeking device "/dev/dm-2" to 18446744073709547008
  ERROR: isw: seeking device "/dev/dm-2" to 18446744073708469760
  ERROR: sil: seeking device "/dev/dm-2" to 18446744073709289984
  ERROR: ddf1: seeking device "/dev/dm-2" to 18446744073709421056
  ERROR: hpt37x: seeking device "/dev/dm-2" to 4608
  ERROR: hpt45x: seeking device "/dev/dm-2" to 18446744073709547008
  ERROR: isw: seeking device "/dev/dm-2" to 18446744073708469760
  ERROR: sil: seeking device "/dev/dm-2" to 18446744073709289984
  done
  Trigger für libc-bin werden verarbeitet ...
  ldconfig deferred processing now taking place

  Now I fear, I'm left with a productive and critical system that cannot
  reboot anymore!

  See also:
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1073108/comments/11
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1073108/comments/12

  Attached you find a file with more information about the update, dist-upgrade, dpkg.log, syslog and lvm configuration.
  Please ask for more information if needed . Thank you.

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