http://blog.csdn.net/wutong_login/article/details/40147057?utm_source=tuicool
http://www.linuxidc.com/Linux/2012-09/69568.htm
http://doc.okbase.net/909012142/archive/238662.html
linux虚拟机拓展大小
原文：http://www.cnblogs.com/lanhj/p/5639316.html
