Initiators may be provided as an on-board component on the motherboard (as is the case with many server-oriented motherboards) or as an add-on host bus adapter. Introduction Storage servers housing 24 SAS hard disk drives per serverĪ typical Serial Attached SCSI system consists of the following basic components: The T10 technical committee of the International Committee for Information Technology Standards (INCITS) develops and maintains the SAS protocol the SCSI Trade Association (SCSITA) promotes the technology. The reverse, connecting SAS drives to SATA backplanes, is not possible. This allows the connection of SATA drives to most SAS backplanes or controllers. SAS offers optional compatibility with Serial ATA (SATA), versions 2 and later.
SAS, like its predecessor, uses the standard SCSI command set. SAS replaces the older Parallel SCSI (Parallel Small Computer System Interface, usually pronounced 'scuzzy' or 'sexy' ) bus technology that first appeared in the mid-1980s. In computing, Serial Attached SCSI ( SAS) is a point-to-point serial protocol that moves data to and from computer-storage devices such as hard disk drives and tape drives.
