Home > Data Protection > PowerProtect DD Series Appliances > Dell PowerProtect Data Domain DD9410 and DD9910 > HA configuration
The Data Domain DD9410 and DD9910 support an Active-Passive high availability configuration in addition to a standalone configuration. Both models need an external DAE for HA configuration in addition to the secondary node, and require new compatible SSDs drives for the cache tier. For each model, the cache tier that is installed on the standalone controller is not supported, and it is recommended to remove it. The Cache DAE, FS240 is where all the new cache tier disks need to be installed. The FS240 DAE is a 2U, 24x2.5” SAS-4 enclosure.
Figure 9 shows the connectivity between the two nodes of an HA pair and the cache DAE. The HA interconnection between two nodes is primarily needed for heartbeat communication, mirroring the SDPM (Software Defined Persistent Memory) data between the hosts and bulk synchronizing traffic. The mirroring function requires RDMA (Remote Direct Memory Access) support, whereas heartbeat and bulk sync requires ethernet traffic. To achieve this in each model, we use a Quad-port 25GbE NIC as the HA internode communication interface. This interface can be used only on slot 7. Out of four ports, two ports will be used for RDMA mirroring and the remaining two will be LACP bonded for heartbeat.