Seagate ST3600002FC Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Perfor
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- Seagate ST3600002FC | Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Perfor - Page 1
Technology Paper Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Performance and Scalability at Lower Cost Introduction In just a few short years Serial Attached SCSI (SAS) has fundamentally altered the enterprise storage landscape. Building on the rock-solid reliability and robust command set - Seagate ST3600002FC | Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Perfor - Page 2
Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Performance and Scalability at Lower Cost Leading Edge = First Plug-fest 6Gb/s SAS 12Gb/s SAS 3Gb/s SAS Ultra 320 SCSI End-User Products: ~12-18 months later 2003 2004 2005 2006 2007 2008 2009 2110 2011 2012 2013 2014 2015 Graphic copyrighted - Seagate ST3600002FC | Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Perfor - Page 3
and a required feature in all 6Gb/s SAS expanders. Furthermore, expanders can now support up to 256 devices. What's more, 6Gb/s SAS expanders support secure zones, similar to fibre channel SAN zones. Utilizing denial of service and device access control by zone technologies, networked storage can be - Seagate ST3600002FC | Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Perfor - Page 4
boost in transfer rate while also enabling the use of longer connecting cables (up to 10 meters, an increase from the 6-meter cables supported by 3Gb/s SAS). Achieving this improvement in throughput and maximum cable length required the use of decision deedback equalization (DFE) technology. DFE - Seagate ST3600002FC | Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Perfor - Page 5
Enterprise-Optimized 6Gb/s SAS Rivals Fibre Channel Performance and Scalability at Lower Cost Graphics copyrighted by SCSI Trade Association, courtesy of Molex. Figure 3. Costly InfiniBand-style connector used by 3Gb/s SAS used by 3Gb/s SAS and relies solely on the mini SAS connector for both
Introduction
In just a few short years Serial Attached SCSI (SAS) has
fundamentally altered the enterprise storage landscape. Building on
the rock-solid reliability and robust command set of its parallel SCSI
predecessor, SAS raised the storage bar with an unprecedented
combination of performance (3-Gb/s transfer rate), scalability
(thousands of devices in one domain) and flexibility (compatibility
with SATA).
In Q3 2005, 3Gb/s SAS systems entered the market and by 2007
were shipping in volume quantities. SAS has supplanted parallel
SCSI as the direct-attached SCSI interface of choice throughout the
enterprise; indeed, it was one of the fastest interface transitions in
market history.
This rapid transition relied on the close working relationship
between the SCSI Trade Association (STA) and the T10 Committee.
The STA focuses on identifying SCSI’s marketing requirements and
providing the forum to reach a consensus on features and benefits
found on the SCSI roadmap, while the role of the T10 Committee
is to develop standard specifications to make it possible for those
features and benefits to be implemented in commercial products.
The T10 Committee developed the new SAS-2 technical
specification (SAS protocol and physical interface enhancements
for transporting SCSI over serial links at up to 6 Gb/s), and the STA
has given the marketing name “6Gb/s SAS” to this new industry
standard (see Figure 1).
Enterprise-Optimized 6Gb/s
SAS Rivals Fibre Channel
Performance and Scalability
at Lower Cost
Technology Paper