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IB single-plane topology
A complete M-Cell assembly consists of four compute racks. Each rack contains 4x physical IRUs - Independent rack units. Using one dual socket node per one blade slot leads to 8 logical IRUs. Each rack contains 4x2 SGI ICE X IB Premium Blades.
The SGI ICE X IB Premium Blade provides the first level of interconnection via dual 36-port Mellanox FDR InfiniBand ASIC switch with connections as follows:
- 9 ports from each switch chip connect to the unified backplane, to connect the 18 compute node slots
- 3 ports on each chip provide connectivity between the chips
- 24 ports from each switch chip connect to the external bulkhead, for a total of 48
###IB single-plane topology - ICEX Mcell
Each colour in each physical IRU represents one dual-switch ASIC switch.
[IB single-plane topology - ICEX Mcell.pdf](../src/IB single-plane topology - ICEX Mcell.pdf)
Each of the 3 inter-connected D racks are equivalent to one half of Mcell rack. 18x D rack with MIC accelerated nodes [r21-r38] are equivalent to 3 Mcell racks as shown in a diagram [7D Enhanced Hypercube](7d-enhanced-hypercube/).
As shown in a diagram 
- Racks 21, 22, 23, 24, 25, 26 are equivalent to one Mcell rack.
- Racks 27, 28, 29, 30, 31, 32 are equivalent to one Mcell rack.
- Racks 33, 34, 35, 36, 37, 38 are equivalent to one Mcell rack.
[IB single-plane topology - Accelerated nodes.pdf](../src/IB single-plane topology - Accelerated nodes.pdf)
