
36 Copyright © Acronis, Inc., 2000-2011
3.5.2 Backup and recovery of logical volumes and MD devices
(Linux)
This section explains how you would back up and recover volumes managed by Linux Logical Volume
Manager (LVM), called logical volumes; and multiple-disk (MD) devices, called Linux Software RAID.
To learn more about LVM please visit http://tldp.org/HOWTO/LVM-HOWTO/ or
http://www.centos.org/docs/5/html/5.1/Deployment_Guide/ch-lvm.html.
3.5.2.1 Backing up logical volumes
Acronis Backup & Recovery 11 Agent for Linux can access, back up and recover logical volumes when
running in Linux with 2.6.x kernel or a Linux-based bootable media.
Backup
In Acronis Backup & Recovery 11 GUI, logical volumes appear under Dynamic volumes at the end of
the list of volumes available for backup. If you select logical volumes for backup, the logical volume
structure will be saved to the backup along with the volume contents. This structure can be
automatically recreated when you recover these volumes under a Linux-based bootable media.
To back up all available disks, specify all logical volumes plus basic volumes not belonging to them.
This is the default choice when you open the Create backup plan page.
Basic volumes included in logical volumes are shown in the list with None in the File system column.
If you select such volumes, the program will back them up sector-by-sector. Normally this it is not
required.
Recovery
When recovering logical volumes, you have two options:
Recovering volume contents only. The type or other properties of the target volume will not
change.
This option is available both in the operating system and under bootable media.
This option is useful in the following cases:
When some data on the volume was lost, but no hard disks were replaced.
When recovering a logical volume over a basic disk or volume. You can resize the resulting
volume in this case.
A system, recovered from a logical volume backup to a basic disk, cannot boot because its kernel tries
to mount the root file system at the logical volume. To boot the system, change the loader
configuration and /etc/fstab so that LVM is not used and reactivate your boot loader (p. 147).
When recovering a basic or logical volume to a previously created logical volume. Such is the
case when you create the structure of logical volumes manually (p. 38) by using the lvm
utility.
Recovering both the structure of logical volumes and their contents.
Such is the case when recovering on bare metal or on a machine with different volume structure.
The structure of logical volumes can be automatically created at the time of recovery (p. 38).
This option is available only under bootable media.
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