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Re: GRUB booting from RAID1 is broken after Ubuntu update: how to recove

From: Andi Meier
Subject: Re: GRUB booting from RAID1 is broken after Ubuntu update: how to recover?
Date: Mon, 02 Aug 2010 23:43:50 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100711 Lightning/1.0b1 Thunderbird/3.0.6

I fixed the boot issue by reinstalling grub using the instructions on

Because this page is German, I will describe in English what I did:

Basically I booted from "Ubuntu Rescue Remix 10.04" (from USB stick) into a 
command prompt and then:

  sudo mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1
  sudo mkdir /mnt
  sudo mount /dev/md0 /mnt

Now I could access my system partition (which was mounted on /).

Install package containing the command grub-install and reinstall GRUB by 
writing it to the MBRs of the RAID1 members:

  sudo apt-get install grub-pc
  sudo grub-install --root-directory=/mnt /dev/sda
  sudo grub-install --root-directory=/mnt /dev/sdb

After rebooting (works now!):

  sudo update-grub

The system seems to work right now, but I receive an error message while 

  udevd-work[121]: inotify_add_watch(6, /dev/sdb5, 10) failed: No such file or 

  nForce2_smbus 0000:00:03.2: Error probing SMB1.

What does that mean? If I can fix this, then I consider my system being 
completely up and running again.


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