DMP uses array support libraries (ASLs) to provide array-specific support for multipathing. An array support library (ASL) is a dynamically loadable shared library (plug-in for DDL). The ASL implements hardware-specific logic to discover device attributes during device discovery. DMP provides the device discovery layer (DDL) to determine which ASLs should be associated to each disk array

In some cases, DMP can also provide basic multipathing and failover functionality by treating LUNs as disks (JBODs).