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XC50 Aries Network Architecture

There are 4 dual socket nodes on blade, connected to a single Aries (switch) chip, and there are 16 Aries chips in a chassis connected to the backplane. On Māui, this implies each chassis contains 64 nodes, or 2,560 Skylake cores. There are 3 chassis in an XC50 cabinet, and two XC50 cabinets are an Electrical "group". Māui has 1.5 groups.


The performance characteristics are:

  1. Intra-Chassis
    1. Backplane
    2. 15 links in the backplane
    3. Rank 1 (green) Network
    4. 14 Gbps
  2. Intra-group
    1. Copper cables
    2. 15 links in 5 connectors
    3. Rank 2 (black) Network
    4. 14 Gbps
  3. Inter-group links
    1. Optical
    2. 10 links in 5 connectors
    3. Rank 3 (blue) Network
    4. 12.5 Gbps

The centrepiece of the Aries network is dynamic routing through a large variety of different routes from Aries A to Aries B. Therewith the effective bandwidth is increased significantly. These dynamic routing on alternative paths is applied on all 3 levels of the network.