Ubuntu 10.04LTS 64 bit raid1 will not boot from second drive

[karlson]

btw, i tried to switch the secondary hdd to the primary sata (without using the other hdd) and from here it couldn't boot either... Hmm. Exactly the same behaviour as when connected to the secondary sata.

It seems something is missing on this drive... But what could it be?

grub...

[mucho_maze]

grub...

Yes exactly. GRUB was not install on /dev/sdb, even though I've run

sudo grub-install /dev/sda
sudo grub-install /dev/sdb

When trying to install on md0 I got the following

sudo grub-install /dev/md0

usr/sbin/grub-setup: warn: Attempting to install GRUB to a partition instead of the MBR. This is a BAD idea.
/usr/sbin/grub-setup: error: embedding is not possible, but this is required when the root device is on a RAID array or LVM volume.

So the question was how to install GRUB. It turned out that I needed to run these commands

grub-setup -r  ”(hd1)” /dev/sdb
grub-install --modules=raid /dev/sdb (thanks to HanB: http://ubuntuforums.org/showthread.php?t=1539205)

in order to install GRUB properly. After these commands have been run, I can take out either of the two drives, sda and sdb, and have a functioning system.

Thanks for all your help.

[GabrielSyme]

Yes exactly. GRUB was not install on /dev/sdb, even though I've run

sudo grub-install /dev/sda
sudo grub-install /dev/sdb

When trying to install on md0 I got the following

sudo grub-install /dev/md0

usr/sbin/grub-setup: warn: Attempting to install GRUB to a partition instead of the MBR. This is a BAD idea.
/usr/sbin/grub-setup: error: embedding is not possible, but this is required when the root device is on a RAID array or LVM volume.

So the question was how to install GRUB. It turned out that I needed to run these commands

grub-setup -r  ”(hd1)” /dev/sdb
grub-install --modules=raid /dev/sdb (thanks to HanB: http://ubuntuforums.org/showthread.php?t=1539205)

in order to install GRUB properly. After these commands have been run, I can take out either of the two drives, sda and sdb, and have a functioning system.

Thanks for all your help.

This post is a year old, but you just saved my bacon, sir! My hat is off to you. Thank you so much. This really should be documented somewhere.