When second-tier switches are used, each clique is considered a group, and the cabinets in the group connect to the same first-tier switches. The number of uplinks to each second-tier switch depends on the number of second-tier switches in use, which depends on the number of nodes and cabinets.
- The two-tier BYNET switch topology enables large system sizes using 36-port switches.
- A single set of first-tier switches can support one or more cliques depending on clique size.
- Large systems are built with multiple first-tier switches interconnected with one to four sets of second-tier switches.
- Second-tier 36-port switches can be installed in any cabinet that does not contain first-tier switches. If all cabinets contain first-tier switches, the second-tier switches can reside in a 9400 cabinet (9400 class).
- Processing nodes and Fabric-Attached Storage of a clique must be connected to the same first-tier switch.
- BYNET-attached PE nodes, TMS, and channel servers can connect to any first-tier switch.
- The number of uplinks for a first-tier switch depends on the number of nodes connected to that switch. Teradata recommends one uplink for each multiple of four nodes. Two uplinks are the minimum required for redundancy.
|Nodes/First-Tier Switch||Uplinks||First-Tier Groups Supported [Maximum Nodes]|
|One Pair of Second-Tier Switches||Two Pairs of Second-Tier Switches||Three Pairs of Second-Tier Switches||Four Pairs of Second-Tier Switches|
|1 to 8||2||18 ||36 ||-||-|
|9 to 12||3||12 ||24 ||36 ||-|
|13 to 16||4||9 ||18 ||-||36 |