https://access.redhat.com/documentation/zh-TW/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/appe-ext4-to-xfs-command-reference.html
http://www.ubuntu-tw.org/modules/newbb/viewtopic.php?viewmode=compact&topic_id=53646&forum=22
http://www.phpini.com/linux/xfs-filesystem-quota
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Storage_Administration_Guide/index.html
http://blog.teatime.com.tw/post/1/4
http://beckjottings.blogspot.tw/2013/07/linux.html
