The multi-path DM-Multipath of the device mapper in a Linux cluster allows you to configure multiple I/O paths between the server node and the storage array as a single device. These I/O paths are physical SAN connections that can contain independent cables, switches, and controllers. Multi-path sets the I/O paths and generates new devices composed of these integrated paths.
This video shows the tutorial of the Linux cluster in the old studio and explains the DM-Multipath and Its configuration.
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Video: http://pan.baidu.com/share/link? Consumer id = 516056032 & uk = 3742764079
This article is from the "old studio" blog, please be sure to keep this source http://lduan.blog.51cto.com/5428084/1303042