This is the most efficient model and results in the fastest transfer rates. Here, the data management application (DMA) uses NDMP over the Ethernet front-end network to communicate with the cluster. On instruction, the cluster, which is also the NDMP tape server, begins backing up data to one or more tape devices which are attached to it by Fibre Channel.
The DMA, a separate server, controls the tape library’s media management. File History—the information about files and directories—is transferred from the cluster by NDMP to the DMA, where it is maintained in a catalog.
Direct NDMP is the fastest and most efficient model for backups with OneFS. Direct NDMP requires either a B100 backup accelerator (or a pool of Gen6 nodes with Fibre Channel connectors) to be present within a cluster.