Each DCU has sixteen PCIe slots. Four IB HCAs are installed in four of the PCIe slots, and one 1GbE NIC is installed in another PCIe slot. The remaining 11 PCIe slots are empty and can be used for optional Fiber Channel PCIe cards to facilitate migration of data from legacy storage subsystems to the storage servers integrated with SuperCluster M6-32.
The number of PCIe slots that are available for an LDom and the number of cards installed in those PCIe slots will not change based on the number of CMUs that are installed in the DCU. However, the number of DCUs that are installed in a compute server does have an impact, because there are certain configuration PDomains that span across two DCUs (extended configuration PDomains), thereby providing additional PCIe slots and cards for certain LDoms.