Install to dual boot on system with existing LVM setup

Alan E. Davis lngndvs at gmail.com
Thu Sep 29 13:24:29 BST 2005


I would like to install Ubuntu x86_64 on a machine with an existing copiy of
Fedora Core 3, installed at the factory. The existing OS is installed on an
LVM volume group taking up all of the existing hdd space on the machine. The
question is how to install a new OS (Ubuntu x86_64) without harming the
existing one.

I have looked over the LVM HOWTO, but didn't see any specifics about this
matter.

These are SATA drives:
1. /dev/sda 74GB 10K rpm
2. /dev/sdb 250GB. 7K rpm

The existing distribution is interesting, but I am unfamiliar with it. I
want to install Ubuntu Breezy for two reasons: to evaluate and so that I can
use something I am familiar with on this new amazing machine.

I'd like to ask how to approach this. I can shrink the Volume Group, I
think. I would like to install on part of the 74GB drive, to take advantage
of the speed. I think the boot partition must be a partition, not part of a
Volume Group. I would be willing to reduce the volume on disk /dev/sda to
30GB for now. I would like to establish a permanent /home partition of some
kindl, perhaps part of it on the fast hdd, and for storage of infrequently
used files, on the slower one. I think I can adopt a new filestructure
hierarchy with an /archive directory where longer lived and less frequently
accessed files may reside, to simplify matters. I like simplicity of LVM,
but I do want to install Ubuntu and perhaps try some other systems for trial
purposes, etc.

How can I abolish the use of /dev/sdb as part of the logical volume, and
part of /dev/sda? That's the first question I need to address.

I realize that Ubuntu is able to use/install upon LVMs. I don't understand
how Ubuntu would know that an OS exists on the existing LVM structure, and
install gently at some distance from it. Much less install its own /boot
partition.

Thanks for the least suggestions.

Alan Davis
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