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SAS supports up to 16,384 addressable devices in an SAS domain and point to point data transfer speeds up to 3 Gbit/s , but is expected to reach 10 gbit/s by the year 2010 . The SAS connector is much smaller than traditional parallel SCSI Connectors allowing for small 2.5 inch drives.

The physical SAS connector is available in 3 different variants:
  • SFF 8482 — which is form factor compatible with SATA .

  • SFF 8484 — hi-density internal connector for connecting up to 4 devices.

  • SFF 8470 — hi-density external connector (aka Infiniband connector) for connecting up to 4 devices.


Form factor compatibility with SATA allows for much cheaper SATA drives to connect to an SAS backplane. SAS drives are not compatible on a SATA bus and have their physical connector keyed to prevent any plugging into a SATA backplane.

Serial Attached SCSI supports three transport protocols:
  • Serial SCSI Protocol (SSP) — Supporting SAS disk drives.

  • Serial ATA Tunneling Protocol (STP) — Supporting SATA disks.

  • Serial Management Protocol (SMP) — for managing SAS Expanders .


A SAS domain is a set of SAS ports communicating with each other. A SAS domain contains one or more SAS devices and a service delivery subsystem. A SAS domain may be a SCSI domain. Each SAS device is assigned a World Wide Name (aka SAS address) assigned by IEEE for the particular vendor. The WWN uniquely identifies the device in an SAS domain just as a SCSI ID identifies a device in a parallel SCSI bus.


EXTERNAL REFERENCES