Serial Attached SCSI

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Serial Attached SCSI (SAS) is a serial interface to transfer data from computer systems to storage devices such as hard drives or tape drives. SAS is the successor to the earlier parallel SCSI interface.

SAS Standards

SAS Roadmap (Source SCSI Trade Assoc.)
3Gb/s SAS
6Gb/s SAS
12Gb/s SAS
Logo 3Gb/s SAS Logo 6Gb/s SAS Logo 12Gb/s SAS
Raw bandwidth (Gbit/s) 3 Gb/s 6 Gb/s 12 Gb/s
Raw bandwidth (Gbit/s)
Wide Port (4 Ports)
12 Gb/s 24 Gb/s 48 Gb/s
Encoding 8b/10b
Transfer speed (MB/s) 300 MB/s 600 MB/s 1.200 MB/s
Transfer speed (MB/s)
Wide Port (4 Ports)
1.200 MB/s 2.400 MB/s 4.800 MB/s
Discovery by initiators by SAS Expanders
SATA compatible
(operation of SATA
HDDs on SAS bus)
Zoning vendor-specific T10 standardised
Spread-Spectrum-Clocking yes
Connection Multiplexing (3Gb/s in 6Gb/s) yes[1]


  1. Connection multiplexing increases link utilization when 3Gb/s SAS components are used in a 6Gb/s SAS infrastructure, An Evolutionary Step for SAS Technology (

External links

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