swapoff /dev/mapper/dmgroup-lvswap
lvreduce -L -54.5G /dev/mapper/dmgroup-lvswap
mkswap /dev/mapper/dmgroup-lvswap
swapon /dev/mapper/dmgroup-lvswap
lvextend -L +54G /dev/mapper/dmgroup-lvroot
resize2fs -p /dev/mapper/dmgroup-lvroot
##### -54.5G is for swap and +54G is for root directory, operating system version centos6.7