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mount LVM duplication drives
Post 302119959 by onthetopo on Friday 1st of June 2007 09:52:49 PM
06-01-2007
How to mount duplicated LVM harddrives resulted from cloning
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!!
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!!
Last edited by onthetopo; 06-01-2007 at 11:01 PM..
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LEARN ABOUT CENTOS
hd
HD(4) Linux Programmer's Manual HD(4) NAME
hd - MFM/IDE hard disk devices DESCRIPTION
The hd* devices are block devices to access MFM/IDE hard disk drives in raw mode. The master drive on the primary IDE controller (major device number 3) is hda; the slave drive is hdb. The master drive of the second controller (major device number 22) is hdc and the slave hdd. General IDE block device names have the form hdX, or hdXP, where X is a letter denoting the physical drive, and P is a number denoting the partition on that physical drive. The first form, hdX, is used to address the whole drive. Partition numbers are assigned in the order the partitions are discovered, and only nonempty, nonextended partitions get a number. However, partition numbers 1-4 are given to the four partitions described in the MBR (the "primary" partitions), regardless of whether they are unused or extended. Thus, the first logi- cal partition will be hdX5. Both DOS-type partitioning and BSD-disklabel partitioning are supported. You can have at most 63 partitions on an IDE disk. For example, /dev/hda refers to all of the first IDE drive in the system; and /dev/hdb3 refers to the third DOS "primary" partition on the second one. They are typically created by: mknod -m 660 /dev/hda b 3 0 mknod -m 660 /dev/hda1 b 3 1 mknod -m 660 /dev/hda2 b 3 2 ... mknod -m 660 /dev/hda8 b 3 8 mknod -m 660 /dev/hdb b 3 64 mknod -m 660 /dev/hdb1 b 3 65 mknod -m 660 /dev/hdb2 b 3 66 ... mknod -m 660 /dev/hdb8 b 3 72 chown root:disk /dev/hd* FILES
/dev/hd* SEE ALSO
chown(1), mknod(1), sd(4), mount(8) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 1992-12-17 HD(4)