CMIOU stands for CPU, memory, and I/O unit. Each CMIOU provides the CPU (1 CMP), memory (16 DIMM slots) resources, and an I/O hub. Each PDomain can include zero to four CMIOUs.
There are several PDomain configurations, based on these factors:
Number of compute servers in SuperCluster M8 or SuperCluster M7
Number of PDomains in each compute server
Number of CMIOUs in each PDomain
These topics describe SuperCluster PDomain configurations: