Three-cabinet systems require second-tier switches. The purpose of the second-tier switch is to interconnect the first-tier switches and provide the connection point for the uplinks that connect to the UDA fabric.
Second-tier switches are located in Cabinet 2 (the first expansion cabinet) in 3-cabinet systems.
SAS 750 System Network Topology for a 3-Cabinet System
- The system consists of one base and two expansion cabinets.
- Each cabinet contains a combination of SAS HPA Worker nodes, SAS Mid-tier nodes, and SAS App Server nodes.
- Each cabinet in the appliance can contain up to four Teradata Connect nodes for use as a gateway to a BYNET V4 or BYNET-Over-Ethernet fabric.
- The base cabinet contains a System VMS for server management.
- Each expansion cabinet contains a Cabinet VMS for server management.
- System is scalable up to 54 nodes and servers in any combination for appliances attached to a UDA (BYNET V5 or InfiniBand) fabric.
- System is scalable up to 60 nodes and servers in any combination for appliances with Teradata Connect nodes.
- 36-port InfiniBand switches in cabinets 1 and 3 provide node-to-switch connections for the redundant InfiniBand networks (Network-0 and Network-1). Connections are shown in the figure. Each node contains a dual port InfiniBand adapter that connects to the InfiniBand switches.
- Six ports on each of the InfiniBand switches in Cabinets 1 and 3 are used to provide the connection to the second-tier switches.
- In UDA configurations, the second-tier switches can be used for UDA connections. 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.