Linux Logical Volume Manager (LVM)

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The Linux Logical Volume Manager, is commonly abreviated to LVM. Although LVM can used for other Logical Volume Management variants as well.

Not all forensic tools have support for Linux Logical Volume Manager (LVM) volumes, but most modern Linux distributions do.

Mounting an LVM from an image

If you have an image mount the LVM read-only on a loopback device (e.g. /dev/loop1) by:

sudo losetup -r -o $OFFSET /dev/loop1 image.raw

Note that the offset is in bytes.

If you need to write to the image, e.g. for recovery, use xmount to write the changes to a shadow file (or cachefile in xmount terminology).

sudo xmount --in dd --cache sda.shadow sda.raw image/

You can then safely mount the LVM in read-write mode (just omit the -r in the previous losetup command).

To remove this mapping afterwards run:

sudo losetup -d /dev/loop1

To scan for new physical volumes:

lvm pvscan

You cannot unmount an active volume group. To detach (or deactivate) the volume group:

vgchange -a n $VOLUMEGROUP

Where $VOLUMEGROUP is the corresponding name of the volume group

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