I converted root filesystem to lvm since the root partition was huge and I needed more flexibility in managing the partitions. Besides, lvm would also enable for easy backups with lvm snapshots.
I had a sizable swap partition of 2GB which I used to transfer my root files to and rebooted to it, prior to the conversion.
Please know what you are doing prior and make sure to create backups.
This is what the partitions looked like prior to the change:# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 ...
