echo '1' > /sys/class/scsi_disk/0\:0\:0\:0/device/rescan
fdisk /dev/sda
Command (m for help): d
Partition number (1-X): X
Command (m for help): n
Command action
e extended
p primary partition (1-X)
p
Selected partition X
Command (m for help): t
Partition number (1-4): 4
Hex code (type L to list codes): 8e
Command (m for help): w
# partprobe -s
# pvresize /dev/sda4
# lvextend -L+XG /dev/vg/vol-name
# resize2fs /dev/vg/vol-name