Author: Sam Sawyer
The new serial interfaces, Serial Attached SCSI (SAS) and Serial ATA (SATA), have been designed to replace their parallel predecessors. They will support faster data transfer rates and more devices per controller, as well as reduce the size and complexity of the cables and connectors (thus enabling smaller, more densely-packed disk arrays). System builders will also be able to integrate SAS and SATA hard drives in a single enclosure.
SAS goes beyond SATA by adding dual porting, full duplex and device addressing; furthermore, it offers higher reliability, performance and data availability services, as well as logical SCSI compatibility. SAS will continue to enhance these and other metrics as the specification evolves, including increased device support and longer cabling distances.