Adding and extending disks/volumes in LVM

In order to use LVM, the partition must be type 8e instead of 83 when created by fdisk.

Create new PV (Physical Volume) using following command:

# pvcreate /dev/sdb1

Verify the volume:

# pvs
# vgdisplay

Extend the volume group in a new disk:

# vgextend vg_root /dev/sdb1

This can be used to span this volume across a second disk

Check the new size:

# vgs
# pvscan

Get the current available size using:

# lvdisplay
# vgdisplay

Increase the size of this logical volume using: (if the volume has already grown using all the space in the new disk, this is not required)

# lvextend -l +100G /dev/vg_root/vol1

In addition, it's required to increase the file system in this logical volume as well:

# resize2fs /dev/vg_root/vol1

Get the current available again size using:

# lvdisplay
# vgdisplay