When compute nodes cannot access the D3940 Storage Module in an HPE Synergy environment, the first thing to check is whether a logical interconnect has been created based on the 12Gb SAS switches. Logical interconnects are essential for defining the connection and communication pathways between the compute nodes and the storage module. Without a proper logical interconnect configuration, the compute nodes will not be able to access the storage module.
Reference: HPE Synergy Configuration and Management Guide