Originally Posted by i92guboj

gparted doesn't support lvm at all, that's why it won't show any fs inside an lvm partition. All it does is to display the LVM label so you know that, but nothing else. It's one of the features I'd like to see in gparted because there's really no decent GUI for the LVM tools, however the command line ones are easy to deal with and work well.

http://gparted.sourceforge.net/features.php

In that table it shows that gparted can only detect LVM groups, but it will not show the fs('s) inside it, nor can do it any other thing. You can think of it as a partition containing partitions, each of which can have a different format. So, on a single LVM volume group you can have lots of different pieces with different formats.

It all is a bit confusing if you have no experience with it because it's not the typical setup you find in other OSes, but there are good manuals around. Once you understand the terminology LVM is much more clear, but that exceeds the purpose of this thread by far.