The system can accommodate up to 36 groups of nodes using six pairs of second-tier, 36-port switches. This allows for up to 972 nodes.
In this document, a group is defined as the collective of nodes connected to a common pair of first tier switches. Each group contains up to 27 nodes.
Second-tier switches are located in Cabinet 2, Cabinet 6, Cabinet 9, Cabinet 12, Cabinet 15, and Cabinet 18, in systems with 19 to 36 groups.
Hadoop 6 System Network Topology for a 36-Group System
- The system consists of up to 36 groups.
- The first cabinet contains Hadoop 6 processing nodes and may contain additional systems (680, 2800, or 2850 systems).
- The other cabinets contain Hadoop 6 processing nodes.
- The first cabinet contains a System VMS for server management, and may contain additional TMSs.
- Each additional cabinet may contain a Cabinet VMS for server management.
- 6 ports on each of the InfiniBand switches in cabinets 1, 3, 4, 5, 7, 8, ... 52, 53 are used to provide the uplink connections to the second-tier switches.
- The system uses six pairs of 36-port second-tier switches. These switches are located in Cabinet 2, Cabinet 6, Cabinet 9, Cabinet 12, Cabinet 15, and Cabinet 18.
- Of the six uplinks leaving each first tier switch, one uplink connection goes to each of the six second tier switches (for each fabric).
- When connected to a UDA network, the second-tier switches can be used for UDA connections. Distribute the UDA connections evenly across the pairs of second-tier switches for best performance. For more information, see the Teradata Unified Data Architecture InfiniBand and Server Management Configuration Guide, B035-6001.
- For port-to-port cabling, see the appropriate Hardware Installation Guide.