The system can accommodate up to 18 groups of nodes using three pairs of second-tier, 36-port switches. This allows for up to 486 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, and Cabinet 9, in systems with 13 to 18 groups.
Hadoop 6 System Network Topology for an 18-Group System
- The system consists of up to 18 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.
- Six ports on each of the InfiniBand switches in cabinets 1, 3, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26 are used to provide the uplink connections to the second-tier switches.
- The system uses three pairs of 36-port second-tier switches. These switches are located in Cabinet 2, Cabinet 6, and Cabinet 9.
- Of the six uplink connections to the second-tier switches, two connect to the first second-tier switch, and two connect to the second second-tier switch, and two connect to the third second-tier switch (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.