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fedora-users: Re: FC14 problem "no root device found"

Re: FC14 problem "no root device found"

From: Gijs <info_at_nospam>
Date: Wed Oct 12 2011 - 20:39:02 GMT
To: Bruno Wolff III <bruno@wolff.to>, fedora-list@redhat.com

On 9-10-2011 17:19, Bruno Wolff III wrote:
> On Fri, Oct 07, 2011 at 20:25:50 +0200,
> Gijs<info@bsnw.nl> wrote:
>>
>> I created a raid-1 device for the /boot partition. I copied my existing
>> boot to /boot and my existing root to the LVM-volume that is ontop of a
>> raid-5 device. I tried booting from it, but I just can't get it to mount
>> the root right after it boots the kernel. I get the message "no root
>> device found".
>>
>> I pretty much tried everything. I recreated the initrd because I thought
>> it might have something to do with the raid device (which I didn't have
>> before). But after inspecting the initrd contents of my original stock
>> kernel, I found mdadm and other raid-related files. So I figured that
>> shouldn't be the problem.
>>
>> I tried specifying the root partition in a number of ways. By UUID, by
>> "/dev/mapper/raid--5--lvm-root", by "/dev/md-0", by "/dev/raid-5/root",
>> by label "root". Nothing worked.
>>
>> Does anyone have any idea how to solve this?
>
> Did you update fstab and mdadm.conf on the new system and rerun dracut?
> (I usually use the kernel update script to rerun dracut so I don't
> need to remember the options.)
>
> The initramfs includes information about which devices to activate before
> doing the root pivot. If you don't have the raid array for root in mdadm.conf
> the array won't be started and hence won't be available to change to.
>
> You might need to do something similar for lvm. I don't use it, so I don't
> need to worry about it.

I thought I updated the initrd, but I guess I used the wrong command. I
checked the command that the RPM of the kernel runs on installation, as
you suggested, and executed that command. Was able to get it booting
right away :) Thanks!
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