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

Deletions:

lvresize -l +100%FREE -n /dev/vg01/backup