SCSI - Small
Computer System Interface:- is a high performance parallel interface for
connected mass storage devices such as disk drives to a computer.
Originally
specificied using logic level (TTL) signals over ribbon cable to daisy chain
upto 8 devices, this standard has been enhanced over the years to include newer
voltage levels, higher speeds and more devices. The standard enables large
amounts of data to be requested using a small number of intelligent commands.
Dur to the popularity of this standard some manufacturers have developed
extenders which enable connection over a long distance, converters such as IDE
to SCSI, and routers which translate the SCSI interface and commands to
fibre channel compatible
signals.
Newer variations such as
Serial Attached SCSI
and Internet SCSI
preserve compatibility at the SCSI driver and command set level, but offer
different connection and routing methods.
...from
Megabyte's Storage
Dictionary | |
. |
 |
the Benefits of SAS
(Serial Attached SCSI) for External Subsystems
This
introduction to Serial Attached SCSI (written by by Adaptec) gives you an idea
of the performance, compatibilities, applications and roadmap for this new
directly attached disk connection standard. With throughput capability faster
than 2Gbps Fibre-channel systems and faster than ultra320 SCSI - the new SAS
products not only provide an upward migration path for parallel SCSI
applications but also open the door to a new class of high performance high
reliability enterprise systems.
...read the article,
...Adaptec profile,
Serial Attached SCSI | | |
. |
| |
|
|
. |
 |
. |
|
Serial Attached SCSI - Delivering Flexibility to the Data Center
If
you think you already know SAS because you know SATA and traditional SCSI then
think again. Sometimes disruptive technologies wear an unassuming disguise. In
fiction, Clark Kent, Frodo Baggins and Buffy Summers at first seem harmless, but
we see them change into Superman, the Ring Bearer and the Slayer.
SAS
too comes cloaked in plain garb - with a physical layer which looks a lot like
SATA. But like the Incredible Hulk there are muscles rippling under that shirt -
and you would be wrong to dismiss SAS so lightly. There's a lot more inside this
interface than it says on the box as this informative article (written by
article by LSI Logic and Maxtor) reveals. ...read the article,
Serial Attached SCSI | | | |