In GNOME, go to System -> Administration -> Logical Volume Management and you can do whateva you wanna do. Here are basic cmds for shell to create/mod your logical vol/grp.
First, you need to create physics volume.
# pvcreate /dev/hdX /dev/hdY
# vgcreate VGNAME /dev/hdX /dev/hdY
# lvcreate -n LVNAME -L SIZE VGNAME
You can enter size in extents (use -l num
option for it) or better use shown switch -L SIZEM
or -L SIZEG
etc to give size in MB or GB.
If you're very beginner, you can also use LVM Management tool.
PS: Good to see one more Indian Nix user