mount LVM duplication drives Post: 302119959

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Top Forums UNIX for Advanced & Expert Users mount LVM duplication drives Post 302119959 by onthetopo on Friday 1st of June 2007 09:52:49 PM

06-01-2007

Registered User

How to mount duplicated LVM harddrives resulted from cloning

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

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 Smilie

. 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!!

Last edited by onthetopo; 06-01-2007 at 11:01 PM..

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LEARN ABOUT CENTOS

isohybrid

isohybrid(1)						      General Commands Manual						      isohybrid(1)

NAME

       isohybrid -- Post-process an ISO 9660 image generated with mkisofs or genisoimage to allow hybrid booting as a CD-ROM or as a hard disk.

SYNOPSIS

       isohybrid [OPTIONS] <boot.iso>

DESCRIPTION

       The isohybrid utility modifies a an ISO 9660 image generated with mkisofs, genisoimage, or compatible utilities, to be bootable as a CD-ROM
       or as a hard disk.

OPTIONS

       -h <X>
	      Number of default geometry heads

       -s <X>
	      Number of default geometry sectors

       -e <X>, --entry <X>
	      Specify parititon entry number (1-4)

       -o <X>, --offset <X>
	      Specify partition offset (default 0)

       -t <X>, --type <X>
	      Specify MBR ID (default random)

       -u, --uefi
	      Build EFI bootable image

       -m, --mac
	      Add Apple File Protocol partition table support

       --forcehd0
	      Assume we are laoded as disk ID 0

       --ctrlhd0
	      Assume disk ID 0 if the Ctrl key is pressed

       --partok
	      Allow booting from within a partition

       -?, --help
	      Display help

       -v, --verbose
	      Display verbose output

       -V, --version
	      Display version information

SEE ALSO

       mkisofs(1)

isohybrid							    17 Jan 2014 						      isohybrid(1)

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