Which requirement differentiates dual-domain from dual-path SAS?

Dual-domain SAS topology connects drives to two separate and independent SAS expander domains, each managed by its own controller, which requires drives to have dual ports to maintain a live path to each domain. This dual-port drive requirement is the fundamental hardware distinction between dual-domain and dual-path SAS, where dual-path uses two paths within a single expander domain and does not mandate dual-port drives. The need for dual-port drives is therefore the requirement that differentiates dual-domain from dual-path.

Dual-domain actually requires more hardware than dual-path because it needs two separate expander domains, dual-port drives, and redundant controllers, making this statement factually incorrect.

Dual-port controllers are commonly used in both dual-domain and dual-path SAS configurations and are not a unique or differentiating requirement exclusive to dual-path topology.

Active SAS cables are not a defined or standard differentiating hardware requirement between dual-path and dual-domain SAS topologies.