Centos | Decrease a LVM partition

Shrinking a root volume | Step 1:

vgchange -a y

Shrinking a non-root volume | Step 1:

umount /dev/centos/var

All following steps now apply to both a root or non-root volume.

Check file system:

e2fsck -fy /dev/centos/var

Resize file system:

The follwing command will shrink the file system so that it is only 4G in size in total!!

resize2fs /dev/centos/var 4G

Reduce Logical Volume:

To reduce to 5G

lvreduce -L 5G /dev/vg/disk-name

To reduce by 5G

lvreduce -L -5G /dev/vg/disk-name

Resize file system (again):

resize2fs /dev/centos/var

Now just mount the file system and thats it.

mount /dev/centos/var /mnt