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SubjectRe: How to install two linux OSes on the same PC
On Wed, 2003-02-05 at 15:06, Narsimha Reddy CHALLA wrote:
> I want to do two different linux installations rh 7.2 and rh
> 8.0 on the same pc with single hard disk. I installed the rh 7.2 in
> partitions say /dev/hda5 ( /) , /dev/hda6 (/home) , /dev/hda7 (
> /usr) ,/dev/hda8 ( /tmp),... /dev/hda11 etc.
> But how can I install the rh 8.0 in partitions say /dev/hda12
> ( as "/" ) ... etc ?? Since the installer won't allow as there
> already exists a "/" partition for the rh 7.2 and tries to override
> it with the root partition of rh 8.0. So I tried giving a different
> lable to the root partition of rh 8.0 say /root1 and other partitions
> as /root1/usr, /root1/home, /root1/tmp etc. But here also the installer
> is looking for the partition named "/" and without that the installation
> is not happening.

I believe the problem is related to Redhat's use of partition labels
by default on 7.x and 8.x. Makes it easy if the drives master/slave
changes but causes problems for other things like this.

For example, my /etc/fstab looks like:
LABEL=/ / ext3 defaults 1 1
LABEL=/boot /boot ext2 defaults 1 2
LABEL=/home /home ext3 defaults 1 2
/dev/hda3 swap swap defaults 0 0
/dev/cdrom /mnt/cdrom iso9660 noauto,owner,kudzu,ro 0 0

Attempting to boot a system with two drives (or multiple partitions on
the same drive) configured like this will confuse the system. So the
first step would be to change the LABEL= lines to /dev/<device> (i.e.
/dev/hda1 /boot ......etc.)

Next issue is how you want to boot the two systems. One boot partition
or two? With one boot, make a copy of what is already there, then
install the new system, allowing it to overwrite the old. Then merge
the two boot partitions by hand. They will already be a different
kernels, etc. so it shouldn't be too hard.

Then I would recommend booting the second system or mounting its drives
in the first temporarily and making similar changes to its fstab that we
did to the first.

Then reboot and I believe it should work....

Good luck,

Dave V.

David E Vehrs, System Engineer Aspen Systems 3900 Youngfield Street
Tel: +01 303 431 4606 Wheat Ridge CO 80033, USA
Fax: +01 303 431 7196

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