In the HPE Alletra 9000 series, each controller node can connect to all 48 drives in the enclosure. This design allows for flexible and efficient access to storage resources by each controller node, optimizing performance and ensuring that the full capacity of the enclosure is accessible. This architecture is crucial for the high-performance demands of mission-critical workloads typically run on Alletra 9000 systems. For further details, refer to: HPE Alletra 9000 Documentation