LVM

Logical Volume Management is used to treat seperate disks as one. However, this can cause trouble when trying to access the disks from a recovery CD, etc.

Mounting

To mount lvm partitions from a livecd (for purposes of recovery/emergency maintenance), simply:

1. modprobe dm-mod to load required modules
2. lvm vgchange -ay to become aware of the volume groups
3. mount as normal with mount /dev/vg_(machine-name)/(distro-name) /location/to/mount/to.

Maintenance

Expand a volume:

1. 1. umount /dev/vg_machine/lv #Resizing a mounted partition is generally a no-no.
   2. lvresize -L +2G /dev/vg_machine/lv #Adds 2G to the logical volume lv.
   3. e2fsck -f /dev/vg_machine/lv #fsck the filesystem up
   4. resize2fs /dev/vg_machine/lv #Expands the filesystem to fill available space.
   5. reboot