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Date: Thu, 18 Oct 2001 07:56:52 -0700 (PDT)
From: "Jeffrey W. Baker" <jwbaker@acm.org>
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To: Norbert Preining <preining@logic.at>
cc: <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.12 cannot find root device on raid
In-Reply-To: <20011018150141.A17493@alpha.logic.tuwien.ac.at>
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On Thu, 18 Oct 2001, Norbert Preining wrote:

> Hi!
>
> I have the following problem:
>
> kernel 2.4.12, md and raid1 compiled into the kernel.
> /dev/hdb old linux installation
> /dev/md0 -> /dev/hde1,/dev/hdg1 new installation
>
> When I boot my old installation the md device is automatically configured
> by the kernel and I can mount it (reiserfs) without any problems.
>
> When I try to boot the new installation with the same kernel the md device
> is initialized, but the kernel cannot mount the root device. I get msgs
> about FAT problems and about mounting root as msdos.
>
> Here some config files:
> lilo.conf:
> image = /boot/lx-2.4.12
> 	root = /dev/hdb1
> 	label = old
> image = /boot/lx-2.4.12
> 	root = /dev/md0
> 	label = new
> 	optional

To use a md as root, you need to add a kernel command line:

md0=1,/dev/hde1,/dev/hdg1

Put that in the append= line of lilo.conf or type it at the lilo command
prompt.

See also Documentation/md.txt in the Linux source tree.

-jwb

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