Manually mount LVM logical volumes

Question

After booting a rescue system (grml) I need to change the configuration of the original system. However, the original system uses LVM for managing the volumes. How can I mount a logical volume "by hand?"

Answer 1

First you need to make sure the LVM tools are installed (package lvm2). With grml that should already be the case. Then you follow this procedure:

1. Check the system for existing volume groups:

   vgscan
   

2. Activate the volume group with the logical volume you want to mount:

   vgchange -ay VG_NAME
   

   Alternatively run vgchange -ay (without a volume group name) to activate all volume groups.

3. Check that the logical volume is present:

   lvs
   

4. Mount the volume:

   mount /dev/VG_NAME/LV_NAME /mnt
   

If needed use chroot to change the filesystem root while you work on the mounted volume.