Basically here is the part of that guide I am following at the moment:
`lvm pvs --units s`
Display the partition Size in SECTORS using parted and take note of the Start sector and partition Number of the partition with “lvm” in the Flags column:
`parted /dev/sda unit s print`
POINT OF NO RETURN – HAVE BACKUPS
So now we need to nuke the old, large partition from the partition table, and immediately recreate it with the exact same Start sector, but with a newer, shorter End sector. To calculate the new End sector, ADD the partition Start sector to the PV PSize, and then add a safety margin…