http://www.tecmint.com/rhcsa-exam-create-format-resize-delete-and-encrypt-partitions-in-linux/2/

http://xmodulo.com/manage-lvm-volumes-centos-rhel-7-system-storage-manager.html

https://notes.taxkiz.com/2015/08/05/centos-7-shi-yong-system-storage-manager-guan-li-lvm/