Sequoia was an SGI cluster. It consisted of 124 nodes with a total of 1304 CPU cores interconnected with a mixture of DDR and QDR Infiniband. Nodes had up to 35GB of memory and a varying number of CPU cores.
Catalpa was MCSR’s most recent single-image, shared memory system. It was an SGI UV 2000 with 320 processor cores and 2.5 terabytes of shared memory.