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LeCroy > Protocol Analyzers
PRODUCTS LeCroy > Protocol Analyzers
SAS (Serial Attached SCSI)
SAS Sierra M6-4
SAS STX A6-4
SAS InFusion

Protocol Analyzers

 

Verify with insight on message layer

 

 

LeCroy is a leading provider of protocol analyzers and verification tools for existing and emerging digital communications standards. Designed to generate, capture, and analyze high-speed communications traffic, LeCroy’s tools help developers to discover and correct persistent and intermittent errors and flaws in their product design

 

 

 

 


 

SAS (Serial Attached SCSI)

 

Serial Attached SCSI (SAS) is a data transfer technology designed to move data to and from storage devices such as disk drives, host bus adapters (HBA), and expanders. SAS is a serialized enhancement and replacement to parallel SCSI. Since SAS ratification in 2004, and it’s move to 6Gbps in 2008, LeCroy has continued to support and innovate with it’s industry leading protocol analysis and traffic generation capabilities

 

 

Overview

 

Serial Attached SCSI (SAS) is the next-generation replacement of SCSI Ultra320. SAS is a serialized protocol. The serial interface offers several benefits over the existing SCSI parallel bus; allowing for high availability, complex storage topologies, and a lower cost structure.

High Availability: As with SATA, Serial Attached SCSI is a high-speed, point-to-point technology initially designed to operate at speeds up to 6Gb/sec. System designers have found that point-to-point serial connections are inherently more reliable than shared bandwidth parallel connections. As a result, point-to-point serial connections have become the preferred method for implementing high-availability systems. SAS based disk drives are dual ported, taking advantage of this feature. This is a key requirement of high-availability SANs that call for redundant paths to all devices in the system.

Complex Storage Environments: SAS storage environments usually consist of a mixture of disk drives, host bus adapters and expanders. SAS allows for addressing of over 16,000 devices. SAS Expanders are routing devices that forward service requests between the source and destination devices. Expanders can be attached to other expanders, disk drives, and other hosts. An important characteristic of Expanders is their ability to aggregate bandwidth by combining multiple physical links into a "Wide" port. These wide ports can function as intelligent switches and can independently send commands across one physical path with data being returned over a different physical path. This increases the complexity of SAS test and debug because it requires users to monitor multiple links concurrently to record all DWORDs associated with a single SCSI transaction. The usage of expanders also allows for usage of a storage concept called Zoning. Zoning allows administrators to restrict access to devices by other devices. Applications of this include separating storage systems within a company by department.

Lower Cost Structure: Serial Attached SCSI also contains support for SATA drives in its storage environments. This allows support for both enterprise-class performance offered by SAS and low cost storage with SATA drives in the same system. Since the cost of the SAS infrastructure is expected to be comparable to SATA, it is likely that SAS will be the preferred interface. Since both SAS and SATA drives can be used in this environment, it will simplify and standardize the storage infrastructure, allowing for the ability to choose which drive will best fit individual storage needs.

 

Protocol Analysis

 

SAS Test and Verification: LeCroy's protocol analysis tools are designed from the ground up to address these unique characteristics of SAS including wide-links and Serial ATA interoperability. Sierra’s analysis and design suites are developed specifically for use with the SAS and SATA protocols, and provide extensive protocol decoding, expert error analysis, and complete user support when decoding and viewing the recorded traffic. This extensive protocol support, combined with the different traffic views, advanced triggering, data filtering, traffic generation, and error injection capability, allows engineers to rapidly become familiar with SAS- and SATA-specific issues, and quickly understand new issues the first time they encounter them. Every engineer becomes a protocol expert with the support of Sierra’s detailed expert analysis.

 

Products

 

SAS Sierra M6-4   Complete solution for Serial Attached SCSI (SAS) and Serial

                        ATA (SATA) Protocol verification

SAS Sierra M6-2   Complete solution for Serial Attached SCSI (SAS) and Serial

                        ATA (SATA) Protocol verification

SAS Sierra M6-1   STX M6-1 SAS/SATA Protocol Verification System

SAS STX A6-4   STX A6-4 SAS & SATA 6G Analyzer System

SAS STX-131   STX-131 SAS & SATA 3.0 & 1.5G 1 Port Analyzer System

SAS STX-231   STX-231 SAS & SATA 3.0 & 1.5G 2 Port Analyzer System

SAS InFusion   SAS Error Injector for Real World Fault Handling and Error

                   Recovery