UNIX for Dummies Questions & Answers

Hi, I'm stuck in an awkward situation please help

I have two identical Seagate 80GB harddrives.
My objective is a bit strange.
1.I want to have a cloned disk as bootable backup
2.When booting using the master drive, I also want to mount the cloned backup disk so I can do incremental backup of certain files . and use the clone disk as free disk space.

I used "dd if=/dev/hda of=/dev/hdb" to clone the harddrive and the cloning worked fine.
Now fdisk lists partition as the following:

Device Boot Start End Blocks Id System
/dev/hda1 * 1 13 104391 83 Linux
/dev/hda2 14 9729 78043770 8e Linux LVM

Device Boot Start End Blocks Id System
/dev/hdb1 * 1 13 104391 83 Linux
/dev/hdb2 14 9729 78043770 8e Linux LVM

The clone works fine but I cannot mount both harddrives at the same time. LVM pvdisplay gives:
Found duplicate PV EKctcS4RyHWiw1JlI3FwWdTe8H0iLbxx: using /dev/hdb2 not /dev/hda2

Suppose hda is the master copy and hdb is the clone. Is there anyway to change the LVM fingerprint of hdb so:
1.hdb2 is mountable, say mount hdb2's home directory as /backup/home when booting using hda2
2.hdb is bootable on its own when hda is physically dead.


I'm using Fedroca Core 3. Thanks a lot!!

Onthetopo,
With your duplicate post:
https://www.unix.com/unix-for-advanced-and-expert-users/38354-mount-lvm-duplication-drives.html
You are breaking one of the forum rules:
One of the Moderators may take an action.

thx for reminder