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Device Mapper Multipathing (DM-Multipath) is a native multipathing in Linux, Device Mapper Multipathing (DM-Multipath) can be used for Redundancy and to Improve the Performance. It aggregates or combines the multiple I/O paths between Servers and Storage, so it creates a single device at the OS Level. Typically, the storage area network (SAN) topology is set up in a redundant way. That means that the connection your server has to the storage will survive a failure of a controller, disk, network connection, or anything on the SAN. It also means that if you’re connecting to the SAN over multiple connections, the logical unit numbers (LUNs) on the SAN will be presented multiple times. If there are four different paths to your LUNs, on the connected node, you’ll see /dev/sda, /dev/sdb, and /dev/sdc, as well as /dev/sdd, all referring to the same device. As all of the /dev/sd devices are bound to a specific path, you shouldn’t connect to either of them. If the specific path you’re ...