Serial Attached SCSI (SAS) is a standard technique used in accessing computer peripheral devices that employs serial transmission of digital data over thin cables. The technique is specified in the ANSI (American National Standard Institute) standard and is called Serial Attached SCSI (Small Computer System Interface). It is also known as ANSI/INCITS 376-2003. In the business enterprise, serial Attached SCSI is particularly of interest for accessing mass storage devices, especially external hard drives and magnetic tape drives. SAS also provides benefits against older parallel methods of data transmission, cables are thinner, and the connectors are a reduced amount of compact. Serial transmission of data allows the use of longer cables than parallel data transfer. Crosstalk problems are less likely in serial interfaces as compared to parallel interfaces, since less conductors in the cables are used. Cost factor is also smaller in serial interface when compare with parallel interfaces.
Transfer Rate of SAS
The SAS 2.0 standard specification enabled almost double of data transfer rate (For SAS devices up to 6 Gbps), even though hardware vendors are manufacturing products to the market which support even higher rates. LSI Corp. in 2013 started distribution of controllers and SAS expanders that support up to 12 Gbps.
Serial Attached SCSI offers an ideal solution for businesses and enterprise with considerable storage, data backup and archiving demands. SAS is extensively considered to be the predominant interface for direct attached storage of data and support hard drive controllers in server farms at enterprise level.