Serial Attached SCSI Standards Overview
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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
3Gb/s SAS (SAS-1) |
6Gb/s SAS (SAS-2) |
12Gb/s SAS (SAS-3) | |
---|---|---|---|
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) |
yes | ||
Zoning | vendor-specific | T10 standardised | |
Spread-Spectrum-Clocking | yes | ||
Connection Multiplexing (3Gb/s in 6Gb/s) | yes[1] |
References
- ↑ Connection multiplexing increases link utilization when 3Gb/s SAS components are used in a 6Gb/s SAS infrastructure, An Evolutionary Step for SAS Technology (scsita.org)
External links
- T10 Working Drafts - Serial Attached SCSI (SAS) (t10.org)
- Serial attached SCSI (en.wikipedia.org)
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