1. Umount the file system.
# umount /data
如无法卸载，需要查出有哪些进程占用lsof /data
2. Perform a file system check.
# e2fsck -y /dev/mapper/datalv
3. Resize the file system.
# resize2fs /dev/mapper/datalv
4. Remount the file system:
# mount /dev/mapper/data /data
5. Check if the file system has been resized.
# df -h