The Slades Wiki

Create new parition on the physical drive:

sudo fdisk /dev/sda
n, then p (primary), then size accordingly
then w to write changes 

Add new extent to Volume Group

sudo vgextend rootvg /dev/sda4

List Logical Volumes

sudo lvdisplay

Extend the logical volume

sudo lvextend -L +100%FREE /dev/rootvg/varlv

Check Filesystem

df -Th | grep "^/dev"

Grow the ZFS file system

sudo xfs_growfx /dev/rootvg/varlv

Grow the ext4 file system
resize2fs /dev/rootvg/varlv