Microsoft Multipath I/O (MPIO) is a framework that allows administrators to configure load balancing and failover processes for Fibre Channel, iSCSI, and SAS connected storage devices. Dell EMC SC Series arrays provide redundancy and failover with multiple controllers and RAID modes.
However, servers still need a way to spread the I/O load and handle internal failover from one path to the next, which is where MPIO plays an important role. Without MPIO, servers see multiple instances of the same disk device in Windows disk management.
The MPIO framework uses Device Specific Modules (DSM) to allow path configuration. Microsoft provides a built-in generic Microsoft DSM (MSDSM) for Windows Server 2008 R2 and above. This MSDSM provides the MPIO functionality for Dell EMC storage customers.
For configuration details, refer to the white paper Dell EMC SC Series Storage: Microsoft Multipath I/O Best Practices.