LVM2 - installer "see" already existing logical volumes [SOLVED]

I've been messing about with LVM for about a week now and ran into a snag with the installer.
Essentially if, for whatever reason, I make my logical volumes, then reboot and start the installer it won't "see" my L.Vols at all.  I did the
modprobe dm_mod
before starting and after starting the installer.  The result is still the same either way.  I ended up removing the L.Vols and re-creating them, then running the installer again.  It seems to be the only way I can get the setup scripts to "find" the Logical Volumes properly if the Physical Extent/Volume Group/Logical Volumes pre-existed before invoking /arch/setup. 
I searched the installation forum but the closest thing I found was this from a year ago:  http://bbs.archlinux.org/viewtopic.php?id=48483.  I'm a bit baffled as to how I can get the installation routine to recognise the volumes exist so I don't need re-create things every time I want to do another install.  Any advice is appreciated.
*goes to search elsewhere*
MS
Last edited by MoonSwan (2009-04-06 23:11:26)

I think once you've modprobe dm_mod, u should be able to do a bunch of commands to activate existing volume groups and logical volumes. I'm running an lvm setup and it took me ages to suss it all out and get up and running.
You can definitely do an lvscan command which should look for logical volumes and list them for you. I think you can activate them through there too. Does doing any of the following give you anything once you've done the modprobe?
pvdisplay
vgdisplay
lvdisplay
Also
ls -al /dev/mapper (I think) should lisy the devices for lvm tht already exist. Sorry can't be more accurate for you at the mo, am not in front of my linux box. :-(

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