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 MOJAVE

pvck

PVCK(8)                                                       System Manager's Manual                                                      PVCK(8)

NAME

       pvck - check physical volume metadata

SYNOPSIS

       pvck [-d|--debug] [-h|--help] [-v|--verbose] [--labelsector] PhysicalVolume [PhysicalVolume...]

DESCRIPTION

       pvck checks physical volume LVM metadata for consistency.

OPTIONS

       See lvm for common options.

       --labelsector sector
              By  default, 4 sectors of PhysicalVolume are scanned for an LVM label, starting at sector 0.  This parameter allows you to specify a
              different starting sector for the scan and is useful for recovery situations.  For example, suppose the partition table is corrupted
              or  lost  on  /dev/sda, but you suspect there was an LVM partition at approximately 100 MB.  This area of the disk may be scanned by
              using the --labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800):

              pvck --labelsector 204800 /dev/sda

              Note that a script can be used with --labelsector to automate the process of finding LVM labels.

SEE ALSO

       lvm(8), pvcreate(8), pvscan(8) vgck(8)

Sistina Software UK                                      LVM TOOLS 2.02.95(2) (2012-03-06)                                                 PVCK(8)

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