Re: Resizing LVM partitions

[Stefan Monnier <monnier@iro.umontreal.ca>]

BTW, instead of rescue mode, you can use the initramfs to do such things
(I like to do that when I don't have a LiveUSB at hand because it lets
you manipulate *all* partitions, including /).

I.e. do something like:

- Reboot
- In Grub, edit your boot script (with `e`) to add `break=mount` to the
  kernel command line.
- Use `F10` to boot with that boot script.
- You should very quickly be dropped into a fairly minimal shell,
  without any password.
- None of your volumes are mounted yet.  Even LVM isn't initialized yet.
- Then type something like (guaranteed 100% untested)

     lvm vgchange -ay                       # Activate your LVM volumes.
     mount /dev/mapper/localhost-root /mnt  # Mount /
     mount --bind /dev /mnt/dev
     chroot /mnt /bin/bash
     lvreduce --size -50G --resizefs /dev/mapper/localhost-home
     exit
     umount /mnt/dev
     umount /mnt
     exit


--- Stefan