31
storage, cable distances Cable/Connector from the host and storage
become more critical for Consolidation system to the drive.
TECHNOL
datacentre scale-out. Decision When 3Gb/s SAS first Commonly referred to as the
Feedback Equalisation (DFE) emerged, the most convenient Data Integrity Field this feature
(and associated training external cabling solution was was adopted in SAS 1.1. This
sequences) is the SAS-2 the InfiniBand connector. The scheme has already been
OGY
innovation that allows SAS to industry eventually demanded implemented in many 4G Fibre
double its performance and denser cabling solutions, and Channel solutions and is likely
maintain compatibility with the small form factor (SFF) to become a requirement for
first-generation deployments. mini-SAS connector was 6Gb/s SAS solutions. Broad
The introduction of DFE adopted. To minimise cabling industry support is expected
allows SAS cabling of up to options and improve integration, for what is becoming a critical
10m at 6Gb/s rates, offering 6Gb/s SAS eliminates the enterprise requirement.
SAS
even greater flexibility in InfiniBand-style connection,
system deployments. consolidating on the mini-SAS SAS’ flexibility allows for an
connector for internal (SFF- infrastructure that effectively
These new features allow SAS 8087) and external (SFF-8088) tiers high-availability and
to keep pace with the connectivity. near-line storage solutions.
throughput offered in PCI As 6Gb/s SAS furthers its
Express 2.0 servers. The Enterprise-Level Data scale-out with topology
improvement in bandwidth Integrity improvements, better storage
allows more drives to be It is recognised that the data management and greater
added to these high- protection schemes used in bandwidth, it extends its
performance SAS links parallel SCSI were incomplete, utility far beyond that of a
without the need for since they did not protect the parallel SCSI replacement. The
additional host controllers or integrity of command fields. ongoing innovations in SAS
ports. In some cases, this has SAS subsequently adopted technology will make it an
the effect of freeing up PCI the T10 Protection Information important vehicle for delivering
Express slots for other system Model that allows data and power-efficient, virtualised server
expansion needs and commands to be protected and secure storage solutions.
reducing cable congestion. from the application layer,
www.lsi.com
WWW.SNS-UK.CO.UK OCT 09
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