GRUB2 not detecting OS on raid partitions

Posted by sleeves on Server Fault See other posts from Server Fault or by sleeves
Published on 2011-06-30T22:23:38Z Indexed on 2011/07/01 0:24 UTC
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I have recently added a drive to a system and have successfully raid'ed (RAID-1) the paritions, with the exception of the boot partition. I have it ready and mirrored, but can't get GRUB2 (update-grub) to find it.

System: Ubuntu 11.04 Raid Metadata: 1.2

If I run update-grub, it finds the kernel images on the /dev/sda2 partition (present root) but not the images on /dev/md127.

/dev/md127 is composed of "missing" and "/dev/sdb2".

fdisk on /dev/sdb confirms that sdb2 is of type fd (raid autodetect) and is also flagged bootable.

I have two things I want to do.

  1. Make the boot.cfg on /dev/sdb2 have a menu option to have the root be /dev/md127
  2. Install grub onto /dev/md127 so the actual boot.cfg from there is being used.

Thanks!

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