参考资料：
https://www.centos.bz/2012/02/installation-and-usage-of-lvm/
http://blog.chinaunix.net/uid-20665047-id-3617908.html
http://www.cnblogs.com/nicholas_f/archive/2011/01/22/1942134.html
http://www.educity.cn/linux/1578027.html
http://blog.csdn.net/it_yuan/article/details/19242445
http://blog.sina.com.cn/s/blog_6e0330010101cony.html
http://www.bubuko.com/infodetail-600913.html
http://www.cnblogs.com/heavyhe/p/4546955.html