WARNING: Backup your data before attempting this.
First, we’ll check the file system disk space usage and logical volume information:
sudo df -h
sudo lvs

Get the information about newly added hard disk using the following command:
sudo fdisk -l

To create the partition on the second Hard disk, use the following command and follow the “on screen” instructions and change the partition type from Linux to LVM (8e):
sudo fdisk /dev/sdb

Identify the already mounted lvm file system type:
df -T

Format the newly created partition using the following command:
sudo mkfs.ext4 /dev/sdb1

Initialize the newly created partition as a physical volume:
sudo pvcreate /dev/sdb1

Check the volume groups using the following command:
sudo vgs

Extend the VG (vg_centos6) with new PV (/dev/sdb1):
sudo vgextend vg_centos6 /dev/sdb1

Extend the logical volume (lv_root) with all the free space of the VG(vg_centos6):
sudo lvextend -l +100%FREE /dev/vg_centos6/lv_root

Finally, resize the file-system:
sudo resize2fs /dev/vg_centos6/lv_root

Verify the file-system is larger using the following commands:
sudo df -h
sudo lvs
sudo vgs

Hope this will help you!
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