Logical Volume Management - Extending root file system online in Linux

Situation : 

On a Linux server, the root file system got full, as it was running some application which is prone to create large number of files. 

If Linux system Partitioning is LVM based then it is very easy. 

Few checks before will certainly help. 

Determine the Volume Group you want to extend and see if the mount point exists on the logical volume belongs to the VG you are extending.  

Steps : 

• Create a Physical volume 
• Add it to the Volume Group, aka, VG
• Extend the logical volume
• Re-size the file system online

Example : 

Physical volume creation 

            pvcreate /dev/sdb

Adding it to the Volume Group 

            vgextend vg_livedvd /dev/sdb

Extending the Logical volume 

            lvextend -L +30G  /dev/vg_livedvd/LogVol00

Re-size the file system online 

            resize2fs /dev/mapper/vg_livedvd-LogVol00