Seagate ST373207LC SAS and SATA: Multiple Benefits of Unified Storage (334K, P
Seagate ST373207LC - Cheetah 73 GB Hard Drive Manual
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- Seagate ST373207LC | SAS and SATA: Multiple Benefits of Unified Storage (334K, P - Page 1
for the Better Thus when Serial ATA (SATA) arrived to supplant its parallel predecessor, the substantial gains it delivered in speed, scalability, data integrity and reliability were more than enough to ensure swift and enthusiastic adoption throughout the storage industry. Serial Attached SCSI (SAS - Seagate ST373207LC | SAS and SATA: Multiple Benefits of Unified Storage (334K, P - Page 2
complex mix of transactional and reference data storage requirements. Savvy system builders and integrators have been quick to recognize even the beleaguered IT departments of today typically require. A SAS infrastructure can easily support a multitude of SATA drives with a single SAS HBA port. As - Seagate ST373207LC | SAS and SATA: Multiple Benefits of Unified Storage (334K, P - Page 3
parallel SCSI hard drives. SAS wisely leverages the proven strengths of its parallel predecessor (rock-solid reliability, mature SCSI command set) while offering in a smaller storage footprint and places fewer demands on support resources and staff. SAS Compatibility Feature SAS backplanes, HBAs - Seagate ST373207LC | SAS and SATA: Multiple Benefits of Unified Storage (334K, P - Page 4
, or TB, equals one trillion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting. Seagate reserves the right to change, without notice, product offerings or specifications. Publication Number: TP581.1-0709US, September 2007
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Introduction
Just as parallel lines never intersect, so too were the parallel
storage interfaces of the last two decades destined to remain
independent. When parallel SCSI and parallel ATA were conceived
over 20 years ago, their roles in IT infrastructure were fundamentally
distinct: servers needed the speed and reliability of SCSI storage,
while economical ATA storage was adequate for desktop use.
Given their disparate duties, compatibility between the two
seemed unnecessary.
However, over time it became increasingly clear that server storage
embraced a broad variety of data, some of which didn’t necessitate
the superior performance and dependability of SCSI storage
(and the higher cost per GB that such storage entailed). Deploying
a separate, redundant parallel ATA infrastructure for such data
was an inefficient and unwieldy workaround.
Furthermore, the fundamental physical and electrical constraints
of parallel storage buses had become increasingly problematic as
faster throughput was sought, discouraging further development.
By contrast, serial interfaces were growing by leaps and bounds
thanks to recent breakthroughs in very large scale integration (VLSI)
technology and high-speed serial transceivers. Simpler, faster and
more robust, serial architecture was clearly the wave of the future.
Change for the Better
Thus when Serial ATA (SATA) arrived to supplant its parallel
predecessor, the substantial gains it delivered in speed, scalability,
data integrity and reliability were more than enough to ensure
swift and enthusiastic adoption throughout the storage industry.
Serial Attached SCSI (SAS) soon followed, and had it merely
emulated SATA’s transition from parallel to serial architecture,
it would nevertheless have represented a significant advance
in SCSI storage.
SAS and SATA: Multiple Benefits
of Unified Storage
Technology Paper