Re: LVM support for anaconda

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Some time ago, on Mon, Dec 10, 2001 at 11:13:46PM +0100, Jirtme Tournier wrote:
> Hi,
> we planed to port the LVM support to anaconda.
> I can't find any CVS server for this project.
> Do we need to start from the begining, or is it possible to have a look at
any
> developpement that have been started at this time ?
> Thanks for your help
>
> --
> Jérôme
>
>

How I did this, for RH 7.1, was to unpack the 2.4.2 kernel sources.  These
come on the RH 7.1 source CD.  I modified the 2.4.2-BOOT .config file to
include LVM as a module.  I then rebuilt the 2.4.2 kernel.  I included the
lvm-mod.o file in the stage2.img filesystem.  During a kickstart post-install,
script I insmod'd the lvm-mod.o file, and created an LVM partition.

You modify the stage2.img filesystem by mounting it using the loopback device,
copying the lvm-mod.o file to the mounted filesystem, umounting the filesystem,
and overwriting the new stage2.img onto an image of CD 1 in the distribution.
You then either burn a real CD from that image or use the image to boot
from NFS.

A problem with this approach is that it only works for partitions created
during that post-install script.  If you want all of the filesystems to
be LVM-ized, you need to figure out how to re-write the modules.cgz file
(also known as the module ball.)  I haven't tried it, but it may be possible
to do this using the buildinstall script.  Erik Troan said that this is
relatively easy to do; see
http://www.redhat.com/mailing-lists/kickstart-list/msg00487.html 

You will also need to figure out how to get anaconda to issue commands to
create LVM-ized partitions.


=====
--Seth Alford
sethal@xxxxxxxxx

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