# mount /opt/Breach 
# df -h /opt/Breach
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_Breach  7.0G  7.0G   15M 100% /opt/Breach
meta-data=/dev/mapper/vg_xps-lv_Breach isize=512    agcount=6,
agsize=327680 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1 spinodes=0
rmapbt=0
         =                       reflink=0
data     =                       bsize=4096   blocks=1826816,
imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks,
lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 1826816 to 7069696
# df -h /opt/Breach
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_Breach   27G  7.0G   20G  26% /opt/Breach

== reduce ==
# df -h /opt/
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_optfs   69G   44G   23G  66% /opt
The goal is to reduce from 70G to 50G 
==== umount ====
# umount /opt/
==== check filesystem ====
check a Linux ext2/ext3/ext4 file system
# e2fsck -ff /dev/mapper/vg_xps-lv_optfs 
e2fsck 1.43.9 (8-Feb-2018)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
optfs: 117811/4587520 files (0.4% non-contiguous), 11609065/18350080
blocks
==== resize2fs filesystem ====
resize2fs - ext2/ext3/ext4 file system resizer
# resize2fs /dev/mapper/vg_xps-lv_optfs 50G 
resize2fs 1.43.9 (8-Feb-2018)
Resizing the filesystem on /dev/mapper/vg_xps-lv_optfs to 13107200
(4k) blocks.
The filesystem on /dev/mapper/vg_xps-lv_optfs is now 13107200 (4k)
blocks long.
==== LVM reduce ==== 
# lvreduce -L -20G /dev/mapper/vg_xps-lv_optfs 
  WARNING: Reducing active logical volume to 50.00 GiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce vg_xps/lv_optfs? [y/n]: y
  Size of logical volume vg_xps/lv_optfs changed from 70.00 GiB (17920
extents) to 50.00 GiB (12800 extents).
  Logical volume vg_xps/lv_optfs successfully resized.
==== verify ==== 
# mount /opt/
# df -h /opt/
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_optfs   50G   44G  3.6G  93% /opt

# lvresize -l +100%FREE -n /dev/vg01/backup 
=== resize xfs ===
==== LVM resize ====
%% 
# lvresize -l +100%FREE -n /dev/vg_xps/lv_Breach
  Size of logical volume vg_xps/lv_Breach changed from 5.00 GiB (1280
extents) to <6.97 GiB (1784 extents).
  Logical volume vg_xps/lv_Breach successfully resized.
==== xfs grow ==== 
# xfs_growfs /opt/Breach