hesela.devSAS wide port
A SAS port containing more than one PHY, allowing separate connections across the port's links.
Port membership depends on matching local and attached SAS addresses, not merely on sharing a connector. One connection uses one pathway even when the port has multiple PHYs. [1]
A four-PHY connector can serve one wide port or separate narrower ports. A dual-port drive instead exposes two ports, which may each be narrow. [2] Redundant paths additionally depend on the intervening controllers, expanders and cabling. [3]
Relations
- related
- sas, sas-phy, sas-expander, dual-port, multipath-io
Citations
- Seagate SAS Interface Manual, Rev. C (2009), sections 2.1.2, 2.1.4 and 5.11.1-2
- Oracle HBA guide: SAS phys, ports, addresses and connectors (2010), appendix G
- IBM Power6 documentation: SAS architecture
Sources & caveats
- The connection model is cited to Seagate Rev. C (2009); no current generation's maximum port width or measured throughput is asserted.