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Introduction to SAS
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This section identifies the basic features of and the premises upon which Serial-Attached SCSI technology has been designed. SAS-specific objects and terminology are defined. Upon completion students are able to:
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• Identify the basic features of SAS.
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• Identify the basic roles of each SAS layer.
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• Define key SAS concepts and components such as PHY, Port, End Device, Expander, etc.
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• Describe the structure of a SAS Address.
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• Identify the three types of transport supported in SAS.
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SAS PHY Layer – PHY Reset
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This section discusses the PHY Layer processes to initialize a SAS link. Trace analysis is used to investigate the Out of Band Signals and frames used for identification of SAS devices and speed negotiation. Upon completion students are able to:
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• Describe how SAS out-of-band signaling works.
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• Identify the process for speed negotiation between SAS devices.
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• Describe the contents of the Identify frame.
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• Identify what happens if the Identify frame is not received in a timely manner.
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SAS Management Protocol (SMP) & Expanders
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This section examines SAS Management Protocol (SMP) and its relationship to SAS Expanders. Trace analysis is used to further examine how to determine topology and routing using SAS SMP frames. Upon completion students are able to:
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• Identify how to setup an SMP connection.
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• Describe the process for discovery and initialization of SAS devices and expanders.
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• Identify how to determine the properties of expanders.
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• Determine the network topology from SMP query functions.
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• Identify the proper format of routing tables.
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• Describe how to read the routing tables from expanders.
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• Describe how to write the routing tables of an expander.
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• Describe how routing is carried out between SAS ports when an Expander is present.
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• Identify the different uses of Arbitration In Progress (AIP) primitives.
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SAS Protocol (SSP) Transport Layer
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This section discusses SAS SCSI Protocol (SSP) functionality. Trace analysis is used to investigate the processing of SCSI commands through SAS . Upon completion students are able to:
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• Identify the frame formats and primitives used for SSP connections.
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• Describe the sequence of information units (IU) used to execute a SCSI command.
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• Describe how connections are managed during SCSI command processing.
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• Identify how an SSP connection is created.
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• Identify how flow control is managed (R_RDY).
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• Describe how guaranteed delivery is handled (ACK/NAK).
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• Identify how to match an SSP frame to a specific SCSI IO.
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• Describe how transport errors are handled for SSP.
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SATA Tunneling Protocol (STP)
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This section discusses SAS SATA Tunneling Protocol (STP) functionality. Trace analysis is used to investigate the processing of SATA IO carried through SAS . Upon completion students are able to:
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• Describe how a SATA link initializes.
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• Identify the role of the Expander in an STP connection.
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• Describe how to create and manage an STP connection.
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• Identify the key differences between SAS primitives and SATA primitives.
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