Library » 2011

Technology demonstration to highlight significant performance benefits of 12Gb/s SAS with existing 6Gb/s drive infrastructure

ACCELERATING INNOVATION SUMMIT, MILPITAS, Calif., November 15, 2011 — LSI Corporation (NYSE: LSI) today announced it is demonstrating the industry's first 12Gb/s SAS expander IC this week at the LSI Accelerating Innovation Summit and Technology Showcase in Milpitas, Calif.

Serial Attached SCSI (SAS) remains the proven platform for storage innovation and the gold standard for enterprise computing

SAN FRANCISCO - November 9, 2011 — Creating significant news for data storage OEMs, system builders and end-users who are seeking fast, flexible and reliable data access, the SCSI Trade Association (STA) ( today announced the definition and standardization phase of 12Gb/s Serial Attached SCSI (SAS) technology is progressing as anticipated. STA, a non-profit industry association established to support and promote SCSI technology, also noted that the development and testing of components such as cables, connectors, protocol analyzers and controllers based on this new generation of SAS for storage solutions has begun in earnest.

SUNNYVALE, Calif., October 24, 2011 - PMC-Sierra, Inc., (Nasdaq:PMCS) or PMC, the semiconductor innovator transforming storage, optical and mobile networks, today announced the Tachyon® SPCve 6Gb/s SAS/SATA protocol controllers with integrated StorClad™ encryption technology. The virtualized nature of cloud data centers make securing corporate, financial and sensitive data paramount. Until now, data security was a network add-on, which made scalability, data encryption and key management difficult and expensive. PMC's SPCve controllers integrate line-rate data encryption into the existing data flow, providing a central, scalable and cost-effective means to secure and manage stored data. In addition, the controller-based encryption architecture is agnostic to drive type or vendor, allowing OEMs and cloud providers to mix and match HDDs and SSDs, and to encrypt their deployed storage infrastructure.

Adaptec Series 6Q RAID Controllers with maxCache 2.0 Read and Write Caching Enable SSDs to Radically Improve Storage Performance

SUNNYVALE, Calif., October 17, 2011 - PMC-Sierra, Inc., (Nasdaq:PMCS) or PMC, the semiconductor innovator transforming storage, optical and mobile networks, today announced the Adaptec Series 6Q with maxCache 2.0 SSD caching designed to accelerate data center and cloud computing application performance. Using solid state drives (SSDs) to cache frequently accessed data, maxCache 2.0 employs an intelligent, learned-path algorithm to radically improve performance of HDD-based arrays. PMC's second-generation SSD caching solution, maxCache 2.0, adds support for write caching to expand the application workloads that can benefit from this technology. The Series 6Q with maxCache 2.0 improves quality of service, offers up to 13 times improvement in I/O operations per second (IOPS) and a 13 times reduction in application latency.

Presenters: Harry Mason, President, SCSI Trade Association
                       Marty Czekalski, Vice President, SCSI Trade Association
Where:   Storage Networking World Fall 2011, Orlando, FL
When:   October 12, 2011

In this presentation Mason and Czekalski present:

  • Update on the SCSI Trade Association
  • Range of SAS & SATA storage solutions
  • SAS technology and market overview
  • Key markets and sample deployments
  • Extending SAS innovation
    • 12Gb/s
    • MultiLink SAS™
    • Advanced Connectivity

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Making the Move from FC to SAS

If you're a regular reader of STA's Serial Storage Wire, you know that there's a transition taking place in the storage industry from FC-AL to Serial-Attached SCSI (SAS) storage architectures and disk drives... NetApp is well into this technology transition, where SAS-connected disk shelves now account for a majority of storage shipped with new NetApp® systems.

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STA looks to the future as SSD devices and dynamic zoning gain in popularity and new features such as 12Gb/s SAS and optical connections begin to unveil themselves

SAN FRANCISCO - October 4, 2011 — The SCSI Trade Association (STA) (, a member-run industry association established to support and promote SCSI technology, announced today that the 12th Serial Attached SCSI (SAS) Plugfest was held September 19-23, 2011, at the University of New Hampshire InterOperability Laboratory (UNH-IOL). Sixteen companies, including both STA members and non-members, attended the event.

SAS Standards and Technology Update

Presenters: Harry Mason, President SCSI Trade Association, and Director of Industry Marketing at LSI, Corp.
                Marty Czekalski, Vice President SCSI Trade Association, and Interface & Emerging Architecture
                Program Manager at Seagate
Where: Storage Developers Conference, Santa Clara, CA
When: September 19, 2011

In this presentation Mason and Czekalski provide:

  • SAS Overview
  • SAS Performance Roadmap and 12Gb/s SAS staging
  • MultiLink SAS™ and Advanced Connectivity
  • SCSI over PCIe (SOP)
  • Backplane Receptacle Compatibility

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Presentation provides attendees a look at how enterprises are solving future storage problems today with SAS

SAN JOSE, Calif., - September 16, 2011 — Organizations of all types are balancing the demand for increasing flexibility in their IT infrastructures with the economic and operational realities of the day. During a presentation on September 19 from 8:30 a.m. to 9:20 a.m. at the Storage Developers Conference being held at the Hyatt Regency Santa Clara in California, Harry Mason, president of the SCSI Trade Association (STA) and Vice President Marty Czekalski are providing attendees with a look at how Serial Attached SCSI (SAS) technology is delivering secure reliable data solutions to the enterprise.

LSI® SAS ROC delivers I/O performance levels needed to unlock the full potential of flash storage and forthcoming PCI Express 3.0-based server platforms

INTEL DEVELOPER FORUM, San Francisco, Calif., September 13, 2011 — LSI Corporation (NYSE: LSI) today announced it is demonstrating its next-generation 12Gb/s SAS RAID-on-Chip (ROC) technology this week, September 13-15, at the Intel Developer Forum (IDF) in San Francisco.

The IDF demonstration showcases a single 8-port 12Gb/s SAS ROC IC achieving over 1.2 million IOPS (I/O operations per second) running small block sequential reads/writes in a PCI Express® 2.0 direct-attached storage configuration connected to eight 6Gb/s Seagate® SAS 2.5-inch hard disk drives.

SAS Technology Overview

Basic SAS architecture and deployment


About STA — 2011

About the SCSI Trade Association in 2011


SAS Positioning

Serial Attached SCSI positioning in 2011:

  • SAS's value
  • Key Messages
  • Technology usage


Extending SAS Innovation in 2011

Extending SAS innovation:

  • 12Gb/s SAS
  • MultiLink SAS™
  • Advanced Connectivity


Key markets and sample deployments of Serial Attached SCSI in 2011


LSI MegaRAID® SAS 9260-8i and MegaRAID CacheCade™ Technologies Combine for Supercomputing Performance Breakthroughs

The National Center for Supercomputing Applications (NCSA) provides data management to some of the most challenging astronomy projects ever conceived.

One such project is the Dark Energy Survey ( This large scale project involving more than 120 scientists from 23 institutions in the United States, Brazil, Spain, and the United Kingdom will collect digital data from astronomical observations in the attempt to solve one of today's great scientific mysteries: why the expansion of the universe seems to be speeding up. NCSA is tasked with processing the data, identifying the galaxies and stars in digital maps of the heavens, and storing it all in a database expected to grow by 400GB daily over the one and a half year life of the project to approximately 200TB of raw image data.

Download full case study.

New Ultrastar™ SSD400M Family Offers a More Cost-Effective Alternative to SLC SSDs While Meeting the Demanding Needs of Tier 0 Enterprise Applications

SANTA CLARA, Calif., Flash Memory Summit, August 9, 2011 - Until recently, conventional wisdom stated that SLC-based (single level cell) solid state drives (SSDs) were the only drives suitable for demanding Tier 0 Enterprise applications. That has changed with the introduction of Hitachi Global Storage Technologies' (Hitachi GST) new Ultrastar SSD400M MLC (multi level cell) SSD family. As a cost-effective alternative to SLC SSDs, Hitachi GST's Enterprise MLC SSDs are the most advanced in the industry, utilizing Intel's 25 nanometer (nm), highest endurance Enterprise-grade, MLC NAND Flash and delivering outstanding performance. Couple this with Hitachi GST's known quality and reliability, and the result is a compelling Enterprise-class MLC SSD that meets the performance, capacity, endurance and reliability demands of today's Enterprise and Cloud data centers. Targeting Enterprise capacity sweet spots, the Ultrastar SSD400M family is available in a 2.5-inch form factor with a 6Gb SAS interface in capacities of 200GB and 400GB.

SAS Anchors Enterprise SSD Deployment

By: Harry Mason, President SCSI Trade Association, and Director of Industry Marketing at LSI, Corp. and Marty Czekalski, Vice President SCSI Trade Association, and Interface & Emerging Architecture Program Manager at Seagate
Where: Creative Storage Conference
When: August 9, 2011

Mason and Czekalski present on SAS's role in enterprise SSD deployment, discussing market factors and forces and how SAS technology provides investment protection and high value for enterprise solutions.

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Intelligent read and write caching software using SSDs delivers up to 13X more transactions per second and 82 percent cost savings compared to HDD-only arrays

MILPITAS, Calif., August 9, 2011 - LSI Corporation (NYSE: LSI) today announced LSI® MegaRAID® CacheCade™ Pro 2.0 read/write caching software for select LSI MegaRAID 6Gb/s SATA+SAS controller cards. The software is designed to dramatically accelerate application I/O performance of hard disk drive (HDD)-based arrays by intelligently caching frequently accessed, or "hot spot," data to solid-state drives (SSDs). MegaRAID controllers featuring CacheCade Pro 2.0 software can deliver up to 13X more transactions per second and an 82 percent cost savings compared to HDD-only arrays.

Presenters from Molex: Galen Fromm, Senior Electrical Project Engineer, Jay Neer, Strategic Product Manager, and Edmund Poh, Senior Product Engineer
Where: Flash Memory Summit
When: August 9 - 11, 2011

Fromm, Near and Poh present a snapshot and status report on Serial Attached SCSI and the development of connectors for enterprise storage bays.

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LSI SAS storage area network technologies boost storage bandwidth and fault tolerance, provide room for growth and reduce costs and complexity at Purdue University

MILPITAS, Calif., August 2, 2011 - LSI Corporation (NYSE: LSI) today announced that Purdue University's Krannert School of Management has implemented an end-to-end SAS storage area network (SAN) based on LSI® 6Gb/s SATA+SAS host bus adapters (HBAs) and industry-first 6Gb/s SAS switch. The LSI SAS SAN solution has helped the school to optimize storage performance and utilization behind its expanded virtual server capacity; deliver an order of magnitude more storage bandwidth; and improve fault tolerance - all at a fraction of the cost of implementing a new Fibre Channel or iSCSI SAN.

Technology demonstrations for OEM customers break the million IOPS performance barrier with a single 8-port RAID-on-Chip ICM

MILPITAS, Calif., July 25, 2011 - LSI Corporation (NYSE: LSI) today announced the industry's first sample shipments of 12Gb/s SAS RAID-on-Chip (ROC), controller and expander ICs to server and external storage OEMs, underscoring LSI® leadership in the SAS market segment. By providing customers with early samples of 12Gb/s SAS silicon, LSI is delivering a key technology milestone and laying the foundation for the anticipated SCSI Trade Association 12Gb/s SAS Plugfest in mid-2012.

Adaptec Series 6E Provides Affordable 6Gb/s RAID that Outperforms Software-based HBAs and SATA Controllers

SUNNYVALE, Calif., July 11, 2011 - PMC-Sierra, Inc., ("PMC") (Nasdaq:PMCS), the network semiconductor innovator, today announced the industry's first true hardware 6Gb/s SATA/SAS RAID controllers with on-board DRAM cache for the entry-level market segment. The Adaptec by PMC family of Series 6E RAID controllers enable HBA and hardware RAID functionality in an affordable single card. Based on PMC's industry-proven PM8013 SRC 6Gb/s RAID-on-Chip (RoC) and ARC RAID stack, the entry-level Series 6 four-port 6405E and eight-port 6805E controllers also leverage compatible GUI and management utility tools featured with all Adaptec RAID controllers.

What You Should Know about SAS

By: Harry Mason, President SCSI Trade Association, Director of Marketing, LSI
Where: FOSE Conference & Exhibition, Washington, DC
When: July 11 - 14, 2011

Mason presents an overview of the SCSI Trade Association, SAS technology and the market for SAS products and technology, including key markets, sample deployments and what SAS innovations will present in the future.


Panel discussion at the Creative Storage Conference provided attendees a look at how media and entertainment professionals in networked production environments rely on the high speed and high capacity of SAS storage

CULVER CITY, Calif., - June 28, 2011 -- During a panel presentation today at the 2011 Creative Storage Conference at the DoubleTree Hotel in West Los Angeles, Harry Mason, president of the SCSI Trade Association (STA) provided attendees with a look at how Serial Attached Storage (SAS) technology is well entrenched in nearly every aspect of enterprise storage, including the digital media and entertainment markets.

SAS Delivers Rich Media Solutions

By: Harry Mason, President SCSI Trade Association, and Director of Industry Marketing at LSI, Corp.
Where: Creative Storage Conference
When: June 28, 2011

Mr. Mason presents on Serial Attached SCSI and how it delivers performance and value in the demanding rich media environment.

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6Gb/s SAS Tachyon Controller Family Sets New Benchmark with up to 16 Ports and More Than 750,000 IOPS

SUNNYVALE, Calif., June 15, 2011 - PMC-Sierra, Inc., ("PMC") (Nasdaq:PMCS), the network semiconductor innovator, today introduced its latest generation of SAS/SATA protocol controllers, which doubles the performance and port density of existing solutions. The Tachyon® SPCv family sets the industry performance benchmark for enterprise storage systems, delivering more than 750,000 I/Os per second (IOPS), integrating 16 ports and supporting advanced data protection. The trend toward solid state drives (SSDs), which can provide a greater than 100x increase in IOPS compared to traditional hard disk drives (HDDs), is dramatically increasing performance requirements for enterprise storage systems. The Tachyon SPCv controller's innovative multi-core architecture enables storage equipment manufacturers to take full advantage of SSD performance.

PMC's Innovative Storage Solutions Accelerate SAS Adoption in Storage Systems and Servers

SUNNYVALE, Calif., June 13, 2011 - PMC-Sierra, Inc. ("PMC," Nasdaq:PMCS), the network semiconductor innovator, today announced that the company has shipped more than 74 million 6Gb/s SAS system ports, establishing PMC as the leading provider of 6Gb/s SAS technology. Unprecedented demand for storage capacity and performance is fueling wide-spread deployment of 6Gb/s SAS 2.5" Small-Form-Factor Hard Disk Drives in both server and networked storage systems. PMC's end-to-end 6Gb/s SAS chipset solution, including Tachyon® SPC protocol controllers, SRCv RAID-on-Chip controllers, and the maxSAS™ family of expanders, is enabling the world's leading storage and server OEMs to rapidly transition from 3Gb/s SAS to 6Gb/s SAS with industry-leading performance, scalability and power efficiency.

MultiLink SAS™ Roadmap

The initiative's purpose is to improve how slot-oriented Solid State Drive (SSD) devices can be configured to improve I/O performance. The externally-accessible backplane slot-based drive architecture will be fully compatible for use with existing SAS/SATA storage devices as well as new devices designed to achieve higher performance.

A new form-factor compatible connector will extend SAS to a 4-port configuration. When running at 12Gb/s, a single slot will be capable of providing up to 96Gb/s of bandwidth (full duplex). Additional signals will be provided for general purpose use within the same connector. The MultiLink SAS architecture is a slot-compatible implementation and will accommodate a variety of SSD form factors as well as existing Hard Disk Drives (HDDs).

Minimizing the impact to protocol changes makes MultiLink SAS primarily an enhancement to the existing connector. It was decided to maintain the existing Small Form Factor (SFF) slot dimensions for ease of refitting an existing system and for providing maximum system flexibility for storage OEMs.

12Gb/s 6Gb/s 3G/bs

SCSI Trade Association White Paper
by: Harry Mason, Director, Industry Marketing, LSI Corp.,
       With Contributions by Jay Neer, Advanced Technical Marketing Manager, Industry Standards, Molex

Serial Attached SCSI (SAS) burst upon the storage scene in 2004 as a serial replacement for the once ubiquitous parallel SCSI interconnect. While much attention is often given to the capabilities of the protocol and to the silicon and software required to implement these systems, it is often the physical interconnections that influence the adoption of I/O in a variety of market segments. Parallel SCSI, for example, supported everything necessary for clustered server deployments; however, the large unwieldy nature of the parallel cables and the restricted cabling distances greatly limited SCSI's applicability in these markets.

Download white paper (PDF)

SAS Advanced Connectivity

Serial Attached SCSI (SAS) burst upon the storage scene in 2004 as a serial replacement for the once ubiquitous parallel SCSI interconnect. While much attention is often given to the capabilities of the protocol and to the silicon and software required to implement these systems, it is often the physical interconnections that influence the adoption of I/O in a variety of market segments. Parallel SCSI, for example, supported everything necessary for clustered server deployments; however, the large unwieldy nature of the parallel cables and the restricted cabling distances greatly limited SCSI's applicability in these markets.
SAS removed many of these restrictions by opening up the bandwidth, improving cabling distances, and providing a compact connection scheme suitable for today's shrinking data center. While first generation solutions made tremendous strides forward, the connection schemes have continued to improve, opening up new markets for SAS in the process.
Below please find links to several useful documents that will help you learn about SAS Advanced Connectivity. Below the links, you will find a Frequently Asked Questions & accompanying answers.







SAS Advanced Connectivity Roadmap
Frequently Asked Questions

Q1. What is the Advanced Connectivity Roadmap?

A1. The Advanced Connectivity roadmap is STA's connectivity roadmap to guide the industry through future SAS storage solutions. It specifies the Mini-SAS High Density (HD) (SFF- 8643/8644) connector as the converged connectivity scheme for SAS-based deployments and in addition, defines the SAS Connectivity Management scheme for simplifying cable and connectivity management.
Q2. Name the factors that stimulated provision of the Advanced SAS Connectivity Roadmap.
A2. Factors which drove provision of the Advanced SAS Connectivity Roadmap include simplification of cable and connector options and the provision of managed connectivity standards. Additional factors include providing high-density connectivity and the extension of active copper cable to 20m and optical cable to 100m.
Q3. What is a Mini-SAS High Density (HD) connector and how does it improve connectivity?
A3. The Mini-SAS HD connector doubles the port density over the Mini-SAS connector. Both internal and external solutions are available and it is electrically improved with less cross-talk and a much better signal-to-noise ratio. It supports active copper and optical cabling as well as SAS Connectivity Management.
Q4. What advantages result by extending copper cables to 20m or optical cables to 100m provide to SAS storage systems?
A4. Longer cables enable more box-to-box, server-to-storage and rack-to-rack connections, thereby providing greater scalability (permitting accommodation of more spindles). Longer cables also allow greater configuration deployment flexibility.
Q5. In which external storage applications is 6Gb/s SAS now advancing dramatically?
A5. Currently, 6Gb/s SAS has made significant advances in drive-attach and there is a growing opportunity for host-attached applications as well.
Q6. Will Advanced SAS Connectivity extend beyond 6Gb/s SAS?
A6. Yes, it will be extended to 12Gb/s SAS when this next SAS generation enters the market.
Q7. What is SAS Connectivity Management?
A7. SAS Connectivity Management is a consistent way of managing the cabling plan in any SAS system using the Mini-SAS HD connector. It is capable of detecting the presence or absence of a cable, number of SAS ports within the connector, what type of connection is being supported, (active, passive, optical), and other attributes important to storage system usability and serviceability.
Q8. What can Advanced SAS Connectivity contribute to cloud computing, large data centers and massive data enterprises?
A8. Advanced SAS Connectivity provides greater distance, flexibility, scalability, serviceability and usability to large-size storage installations and uses.
Q9. What are the primary advantages of SAS Connectivity Management?
A9. SAS Connectivity Management defines connectivity support including connection discovery and cable management; improved serviceability and usability without the need for mechanical keys; it also provides rapid fault isolation and minimal configuration errors; and last, it lowers Total Cost of Ownership (TCO).
Q10. In which SAS generation will SAS Connectivity Management appear?
A10. SAS Connectivity Management may be implemented rather quickly on the existing 6Gb/s SAS generation supported by the QSFP connector. While STA recognizes that some homogeneous deployments may use this connector, it is not the preferred connector for heterogeneous deployments. Mini-SAS HD systems are expected to take advantage of SAS Connectivity Management. These advantages will appear in the current 6Gb/s SAS generation, possibly in the first half of 2010. They will appear subsequently in the 12Gb/s SAS generation.

6Gb/s SAS Definition

6Gb-s.cmyk.jpg6Gb/s SAS has many enhancements beyond 3Gb/s SAS. It has more bandwidth per connection, greater scalability, and enhanced features. 3Gb/s SAS usage models will be preserved in 6Gb/s SAS along with the retention of 1.5 Gb/s and 3Gb/s SAS/SATA compatibility. There are many other targeted improvements beyond first generation 3Gb/s SAS, assuring enterprise storage users that SAS technology will continue to meet their needs.

3Gb/s SAS Definition

Thumbnail image for SAS.cmyk.jpgThe first generation, 3Gb/s SAS, replaces parallel SCSI which could no longer keep pace with industry performance and scalability demands. SAS fulfilled the storage industry's need for faster systems with more advanced capabilities. SAS features which support faster performance include dual-port drives and wide ports, enabling full-duplex data transmission plus aggregated bandwidth. Universal connectivity is an added SAS advantage.

SAS.cmyk.jpgSCSI and SAS standards developed by T10 have historically been given marketing names by the SCSI Trade Association (STA), for numerous reasons. In some cases, multiple T10 documents are required to describe a particular SAS generation. In other cases, the document names can contribute to a fair amount of market confusion, and at times, features made optional or required by T10 are inconsistent with market demands.

Serial Attached SCSI

Serial Attached SCSI

The industry is gearing up for Serial Attached SCSI (SAS), a new, faster version of SCSI designed to meet the demands of enterprise IT for the coming decade. The SAS interface supports both SAS disk drives for mission critical applications and Serial ATA (SATA) drives for low-cost bulk storage of reference data, giving IT managers greater price and performance flexibility in their storage strategies. As a result, managers can now make storage decisions that better align with business requirements, balancing their storage investment between compatible technologies and assigning storage devices to data based on the information's business value, providing a more cost-effective solution. (By Enterprise Management Associates, November 2004)

SAS General Overview

SAS General Overview - 1.3MB

General marketing background, followed by the key topics from each layer.

Serial Attached SCSI Logos — 3Gb/s

The Serial Attached SCSI logo was created by the SCSI Trade Association (STA) membership to facilitate the identification of the Serial Attached SCSI architecture in the market place.

STA has not established a trademark or product compliance program to be associated with the logo. STA assumes those using the logo will do so in a manner that accurately depicts conformance with the Serial Attached SCSI specifications promulgated by the T10 Committee. STA expects that the market will use the Serial Attached SCSI logo as it has made use of the term "SCSI" as well as the various graphical and iconic representations of that standard.

In this regard this style guide has been prepared to encourage a consistent use of the logo to build a voluntary brand identity for this new and important interface.

The base design is a two-color logo in a borderless rectangle as shown below. There is also an "icon" version of this logo. The logo and icon may only be reproduced in the established two-color version or in black and gray-scale. Please refer to SAS Style Guide for more information about usage of the SAS logo and icon.

The various options are all available in .eps, .tif and .jpg formats for both color and black and gray-scale versions. Each .zip file below contains each of the 3 formats for the version displayed:

Click Here to Download
1.4 MB zip file
Click Here to Download
1.2 MB zip file

Serial Attached SCSI Cables and Connectors

Serial Attached SCSI Cables and Connectors

In the process of defining and standardizing the Serial Attached SCSI technology, the T10 technical and SFF committees have defined cables and connectors to support the many different SAS-based system topologies that can now be developed. These cables and connectors are available today from many suppliers. Additional connectors are also in development that will provide higher I/O density. This white paper summarizes these solutions and provides direction for the connectivity implementation of SAS-based systems. (February 2005)

SAS Architecture

SAS Architecture - 348KB

Covers the SAS object model, physical links and phys, ports, SAS devices, expander devices, domains, edge expander device sets, pathways, connections, SAS address, reset sequences, state machines, transmit data path, and describes the expander device model.

SAS Raid-On-A-Motherboard: Affordable, high performance RAID

Full-featured RAID data protection is becoming a standard feature in businesses of almost any size, thanks to the increasing affordability of implementing RAID technology. Cost-effective RAID-on-motherboard (ROMB) solutions, using integrated RAID-on-Chip (RoC) devices, enable system integrators to implement robust hardware RAID solutions while optimizing their server motherboard investments. With the union of high-security, cost-effective ROMB and the built-in reliability and availability features included with SAS, system IT managers can now meet the data security requirements of tomorrow on the restrictive budgets of today. (April 2005)

SAS Physical Layer

SAS Physical Layer - 256KB

Describes the lowest layer of SAS, covering passive interconnects (cables and connectors) and electrical characteristics.

Managing Access Control Through SAS Zoning

Managing Access Control Through SAS Zoning

Serial Attached SCSI (SAS) is gaining popularity in small storage area network (SAN) server environments. With its rise in popularity comes the need to segregate and manage device traffic in a similar fashion to what is already done in larger Fibre Channel networks by using zones or in Ethernet using virtual LANs. By doing this, IT administrators can create much more flexible, scalable, and efficient server networks that meet their business needs. SAS zoning, a proposal to the T10 Technical Committee for inclusion in the SAS-2 specification, provides this capability. (September 2005)

SAS Phy Layer

SAS Phy Layer - 256KB

Describes 8b10b coding, OOB signaling, and speed negotiation.

SAS Link Layer - Part 1

SAS Link Layer - Part 1 - 364 BK

Covers primitives, clock skew management, CRC, scrambling, bit order, address frames, identification and hard reset sequences, and connections.

SOptimizing Storage with SAS: Seize the 15K Advantage

Enterprise storage is entering a new era of cost-effectiveness and efficiency, driven by the growing movement towards specialized storage solutions. The value proposition of this application-focused storage is straightforward: Optimize price/performance by matching the storage device to the specific characteristics (quantity, needed availability, etc.) of the data. Naturally, such an approach requires multiple device types, each cost-effectively performing its respective storage duties. (April 2006)

  • Welcome Introduction (Harry Mason, LSI & STA)
  • SAS Market Update (Mike Karp, EMA)
  • Delivering on the Promise of SAS (Todd Mottershead, HP)
  • SAS To The Rescue (Arlin Sorenson, Heartland Technology Solutions)
  • SAS: Improving Performance, Lowering Cost (Bob Griswold, Microsoft)
  • SAS Powers Ahead! (Marty Czekalski, Seagate & STA)

SAS_OH_2008_v8 1.pdf

SAS Link Layer - Part 2

SAS Link Layer Part 2 - 344 BK

Covers arbitration fairness, deadlocks and livelocks, rate matching, SSP (Serial SCSI Protocol) frame transmission, STP (Serial ATA Tunneling Protocol) and Serial ATA frame transmission, and SMP (Serial Management Protocol) frame transmission.

SAS Steps In

SAS Steps In

Over the past several years, companies have enjoyed a wide selection of technologies within the enterprise disk array market. Serial ATA (SATA), Fibre Channel (FC), and even parallel SCSI are viable options. More recently, Serial Attached SCSI (SAS) has entered the mainstream enterprise-class storage market, and its share is growing rapidly. Gartner Dataquest expects SAS to grow from its current 8 percent market share in multi-user drive shipments to 16 percent in 2007. By 2009, analysts expect SAS to make up 45 percent of that market. (March 2007)

  • Welcome & Introduction to SAS (Marty Czekalski, Maxtor)
  • Impact of SAS on Storage (Phil Brace, LSI Logic)
  • Transitioning the Market to SAS (Bob Moore, HP)
  • Database Server Bricks: Case Study (Rich Johnson, Microsoft)
  • Demo Preview & Questions (Harry Mason, LSI Logic)

SAS_OH_presentation_060509 1.pdf

SAS in the Enterprise Data Center

March 2005 IDF Storage Community Presentation, by Marty Czekalski

  • SAS Products Entering the Market
  • SAS Advantages
  • SAS System Features
  • SAS Protocol is the Key to System Communication
  • Typical SAS High Availability System

Mar05StorageCommunity 1.pdf

SAS 1Q04 Industry Briefing

Steve Denegri, RBC — Predicts

"Serial Attached SCSI (SAS) is poised for adoption as a data transport in addition to its usage as a disk interface. In fact, with direct-attach storage (DAS) remaining a popular choice for incremental disk capacity needs, a tremendous opportunity exists for SAS in connecting these storage resources to servers. Just as SAS will likely displace Parallel SCSI as the interface of choice for enterprise disk drives, a similar upgrade to SAS may also take place at the host-attach level."

Jan04IndustryUpdate 1.pdf

SAS SCSI Upper Layers

SAS SCSI Upper Layers - 308 BK

Covers SCSI standards organization, basic SCSI architecture, important SCSI commands and status codes, important task management functions, SCSI transport protocol services, the SSP (Serial SCSI Protocol) transport layer, SAS-specific mode pages, SAS-specific log pages, and power conditions/spinup controls.

SAS Starter Kit: Mixing SAS and SATA Drives in a Single Enclosure

Serial Attached SCSI (SAS) has begun to play a key role as the enterprise continues to move towards more optimized, cost-effective storage platforms. Overcoming many of the limitations of traditional parallel SCSI implementations, SAS solutions that offer connectivity choices and support both SAS and Serial ATA (SATA) drive technology enable enterprises to easily create tiered storage environments. However, concerns about performance expectations and Rotational Vibration Interference (RVI) in mixed SAS/SATA environments are preventing many organizations from adopting SAS technology. (March 2007)

SAS ATA Upper Layers

SAS ATA Upper Layers- 228 BK

Covers basic ATA architecture, the ATA task file, ATA commands, Serial ATA frames, and compares ATAPI (ATA Packet Interface) vs. native SCSI.

3Gb/s SAS

The first generation, 3Gb/s SAS, replaces parallel SCSI which could no longer keep pace with industry performance and scalability demands. SAS fulfilled the storage industry's need for faster systems with more advanced capabilities. SAS features which support faster performance include dual-port drives and wide ports, enabling full-duplex data transmission plus aggregated bandwidth. Universal connectivity is an added SAS advantage.

12Gb/s 6Gb/s 3Gb/s

Optimizie Your Investment with Serial Attached SCSI (SAS)

Since the emergence of Serial Attached SCSI two years ago, many high-end storage solution providers and OEMs have recognized the advantages of SAS over its parallel predecessor. Vertical markets that have since adopted SAS technology are the entertainment industry, medical imaging, financial institutions and research and government institutions, which typically need performance and/or capacity. SAS can offer good value, performance, and scalability. (October 2007)

SAS Overview

Overview of SAS architecture and position in the market; by: Marty Czekalski, Technical Marketing Manager, Maxtor — Member of the Board and Vice President of SCSI Trade Association.

  • Serial Attached SCSI is the next evolution of SCSI beyond U320
  • SAS has been designed to be a device and near cabinet interface only, not a network interface
  • Leverages an enhanced Serial ATA PHY while adding support for a second port
  • Serial SCSI utilizes features of Fibre Channel AND compatibility with SATA drives in a point-to-point, switched architecture


SAS Management Upper Layers and Port Layer

SAS Management Upper Layers and Port Layer - 208KB

Covers the SMP transport layer and all the SMP functions, and concludes with a look at the port layer (which ties the transport layers to the link layers).

What is Serial Technology?

Data travels in time and space between system components--the server and PC, the PC and connected devices, and within the software. Data that is transferred serially moves one bit at a time in linear succession through a fast single path. In contrast, data transferred in parallel mode consists of many data bits moving together simultaneously on a shared pathway.

The primary differentiator between serial and parallel architectures is the clock. In serial technology the clock is embedded in the data. This results in data constantly moving through the system from one point to another using the bandwidth to the fullest extent. A parallel architecture clock moves data at a measured pace, resulting in intermittent periods of inactivity. Data using parallel paths is akin to a vast army marching under the command of one general--it simply can't move as fast. The benefits of serial technology are well understood and are now being used for the most advanced desktop and enterprise applications including USB, 1394, Ethernet and Fibre Channel.

SAS_Brochure2003 1.pdf

SAS Comparison to Fibre Channel FCP

SAS_FCP_comparison_public.pdf - 116KB

Covers the SMP transport layer and all the SMP functions, and concludes with a look at the port layer (which ties the transport layers to the link layers).

SAS Quiz Questions & Answers

SAS Quiz Questions - 76KB
SAS Quiz Answers - 86KB

A few fill-in-the-blank slides that review some key concepts.

Serial Attached SCSI Architecture

  • Key Serial Attached SCSI Features
  • Serial Attached SCSI Topology
  • Multiple Pathways Allow Concurrent Operation
  • Maximum Expander Device Topology
  • Two Edge Expanders
  • Typical Serial Attached SCSI Configuration
  • Out of Band Signaling (OOB)
  • Serial Attached SCSI Expander Operation (with SAS drives)
  • Serial Attached SCSI Expander Operation (with SATA drives)
  • Serial ATA Command Queuing and Serial Attached SCSI
  • Enabling Future Compatibility


San Francisco, Jan 18th 2011 - The SCSI Trade Association (STA), a member-run industry association established to support and promote SCSI technology, announced their newly elected Board of Directors for 2011. Re-elected to the position as president was Harry Mason of LSI Corp., who will serve as STA president. Also re-elected was Martin Czekalski of Seagate Technology, who will serve as vice president. Two new members, Alan Yoder of NetApp and Dan Reno of Western Digital, joined the Board. All other Board members served last year.

"In 2010, STA introduced our MultiLink SAStm initiative, which we will continue to develop and promote throughout 2011," said Harry Mason, president of STA. "In addition, STA held the eleventh industry SAS plugfest, which included the first coordinated Mini-SAS active cable testing program. STA has numerous 2011 initiatives focused on advancing every level of tiered storage, including low-latency storage device like SSDs. Industry education through various outlets, including storage conferences, trade shows, electronic journals, and other publications, will continue to be a focus for the organization.