Dynamic Multi-Pathing (DMP) is an optional software component in InfoScale products that provides redundant path support for your storage. This support is provided by DMP device-specific modules (DSMs). You can add DMP to a clustering configuration.

The steps for adding DMP are given for both a new cluster configuration and an existing cluster configuration. The cluster configuration can be either VCS or Microsoft clustering. The steps for enabling DMP are done after a cluster is up and running and tested. A second host bus adapter in each computer allows redundant paths to the storage for fault tolerance purposes. The DMP software controls the usage of the paths and allows only one path to the storage to operate at a time. However, if one path fails, the DMP software will automatically transfer the storage to the second path.

During the product installation, if you plan to install the DMP DSMs, you must connect only one host bus adapter path.

For the hardware setup step for each server, install the second host bus adapter in each computer, but do not connect it to the switch. After SFW and the cluster are set up and working and the DSMs installed and running, perform the additional steps to activate the DMP DSMs.