Step by step instructions on how an incorrectly configured /home was resized to 5Gb on one of our servers.
umount /home e2fsck -f /dev/mapper/aktagon--1-home resize2fs /dev/mapper/aktagon--1-home 5G lvreduce -L 5G aktagon-1/home mount /home
First /home was unmounted as a precaution. Then the filesystem was fsck'ed. After that the file system was resized to 5Gb and finally the underlying LVM logical volume was resized.