Shrink ext4 volume
From DWIKI
Run fsck
e2fsck -f /dev/mapper/foo
Check minimum size
resize2fs -P /dev/mapper/foo
gives you minimum size in 4k blocks
Shrink filesystem
resize2fs -p /dev/mapper/foo 500G
Shrink volume
lvresize -L 500T /dev/mapper/foo
e2fsck -f /dev/mapper/foo
resize2fs -P /dev/mapper/foo
gives you minimum size in 4k blocks
resize2fs -p /dev/mapper/foo 500G
lvresize -L 500T /dev/mapper/foo
