Serial Attached SCSI: Difference between revisions
Some initial data on SAS, I hope someone can contribute more |
Ooops, removed a tag that shouldn't have been in there. |
||
| Line 13: | Line 13: | ||
==References== |
==References== |
||
{{FOLDOC}} |
|||
http://www.scsita.org/aboutscsi/sas/tutorials/SAS_General_overview_public.pdf - SAS General Overview |
http://www.scsita.org/aboutscsi/sas/tutorials/SAS_General_overview_public.pdf - SAS General Overview |
||
Revision as of 02:31, 8 November 2004
Serial Attached SCSI
Serial Attached SCSI (also known as SAS) is a new generation of SCSI designed to allow for much higher speed data transfers. SAS does this by serial communication instead of the parallel method found in traditional SCSI devices.
SAS supports up to 16,256 addressable devices per port and point to point data transfer speeds up to 3Gbps, but is expected to reach 10Gbps by the year 2010. The SAS connector is much smaller than traditional parallel SCSI connectors allowing for small 2.5 inch drives.
The physical SAS connector is form factor compatible with SATA, allowing for much cheaper SATA drives to connect to a SAS backpane. SAS drives are not compatible on a SATA bus and have their physical connector keyed to prevent any plugging into a SATA backpane.
Serial Attached SCSI supports three transport protocols:
- Serial SCSI Protocol (SSP) - Supporting SAS disk drives
- Serial ATA Tunneling Protocol (STP) - Supporting SATA disks
- Serial Management Protocol (SMP) - Supporting SAS Expanders
References
http://www.scsita.org/aboutscsi/sas/tutorials/SAS_General_overview_public.pdf - SAS General Overview