ATTO Technology 2200R/D, 3200R, 2100R Scsi Architecture Model SAM-2 Logical Unit Addressing, Bit

Page 43

ATTO Technology, Inc.

ATTO FibreBridge Installation & Operation Manual

SCSI Target Identifier

The SCSI Target Identifier indicates the SCSI ID assigned to the target. Each device on the same physical SCSI bus must be assigned a unique SCSI ID. A Wide (16-bit) SCSI bus will support a maximum of 16 SCSI IDs (including the SCSI ID assigned to the FibreBridge).

SCSI Logical Unit Number

The SCSI Logical Unit Number indicates the logical unit being addressed within the specified target.

SCSI Architecture Model (SAM-2) Logical Unit Addressing

The SCSI Architecture Model – 2 (SAM-2) specification defines a reference model that specifies common behaviors for SCSI devices, and an abstract structure that is generic to all SCSI-3 I/O system implementations. The structure for Logical Unit Addressing is detailed below.

What is a Logical Unit?

A logical unit is the entity that executes SCSI Commands sent by SCSI initiators. A logical unit is addressed by a Logical Unit Number (LUN). A LUN is represented by a 64-bit number in Fibre Channel and a 5-bit number in parallel SCSI. The FibreBridge will map between an 8-byte (64-bit) Fibre Channel LUN and a parallel SCSI LUN.

Hierarchical Addressing Model

SAM-2 defines the concept of hierarchical LUN addressing and the four addressing levels that are supported. The hierarchical LUN address is shown in the table below.

 

 

 

 

 

 

 

 

 

 

 

Bit

7

6

5

 

4

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

(MSB)

 

 

First level addressing field

 

 

 

1

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

2

(MSB)

 

 

Second level addressing field

 

 

 

3

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

4

(MSB)

 

 

Third level addressing field

 

 

 

5

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

6

(MSB)

 

 

Fourth level addressing field

 

 

 

7

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The FibreBridge implements a single level of hierarchical LUN addressing by using the 16-bit “First Level Addressing Field”. The contents of the second, third and fourth level addressing fields are ignored by the FibreBridge.

Addressing Field Format

Each of the four addressing level fields is structured as a 16-bit value with the following format.

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Contents Atto Technology, Inc Atto FibreBridge Atto Technology, Inc Atto Fibrebridge Benefits and Features Updating the Firmware Within the Fibrebridge Atto Technology, Inc FibreBridge Product Module Description IntroductionFC Rack System Product Description References Fibre Channel TechnologyFibre Channel Switch Support Atto FibreBridge Benefits and FeaturesAtto FibreChain FibreBridge Feature Comparison FeaturePhysical Dimensions Atto FC Rack Enclosure and Power ModulesMounting Cooling Airflow EnvironmentalCooling Fans Power Module Internal Power DistributionIEC Power Receptacle and Switch LED IndicatorInstallation and Removal Atto FC Rack System Installation Considerations Atto FibreBridge Product Module Integration Power RequirementsAtto FibreBridge Power Connector Scsi Ports Fibre Channel PortsFibreChain Ports 2100 model only LED IndicatorsAtto FibreChain Port LEDs 2100R model only Serial Port Ethernet PortFibreBridge2200R/D Front View FibreBridge 2200R/D2200R/D Side view with hole dimensions Cooling and Airflow Power SupplyScsi Fibre Channel PortLED Indicators on FibreBridge 2200R/D Cabling a FibreBridge Quick Installation InstructionsScsi Cabling Scsi Termination Typical Scsi CablesCable Length ConnectorConnector Laser Type Fibre Channel CablingGbic Module and Gbic Guide System Gbic Installation InstructionsMedia Interface Adapters MIA Gbic Removal InstructionsPin # Name MIA Installation MIA DB9 ConnectorMonitoring and Managing the Atto FibreBridge FibreBridge ServicesAtto BridgeTools Graphical Interface Configuration Program Accessing the Atto FibreBridge over the RS-232 interfaceSetting up the IP Address using the RS-232 port Accessing the Atto FibreBridge over the Ethernet PortAccessing through FTP Atto Technology, Inc What is Serverless Backup? Serverless Backup SupportSegment Descriptors General Operation of Serverless BackupEnabling Serverless Backup on the FibreBridge Target DescriptorsFlashing the FibreBridge Updating the Firmware Within the FibreBridgeIdentifying the FibreBridge Addressing Scsi DevicesIdentifying the Scsi Devices Connected to the FibreBridge Default Address Translation Addressing Devices Connected to the FibreBridge Appendix a Fibre Channel to Scsi Address MappingArbitrated Loop Port Address Alpa Fibre Channel AddressingScsi Address Components Fibre Channel World Wide Name WWNBit Scsi Architecture Model SAM-2 Logical Unit AddressingPeripheral Device Addressing Method Bit Number Address Address Method Specific DefinitionVirtual Device Addressing Method FibreBridge Default ModeLogical Unit Addressing Method Address Descriptors SCSI-3 Command Changes for Hierarchical Addressing SupportSCSI-3 Inquiry Command Fibre Channel to Scsi Address MappingAddressing Connected Scsi Devices What to Expect When Setting Device IDsSCSI-3 Report LUNs Command Setting the ID of the FibreBridgeAtto Technology, Inc Scsi Device ID Translated LUN as it appears to the Host Configuration for Consecutive IDsAtto Technology, Inc European Standards Appendix B Radio and Television InterferenceFCC Standards Canadian StandardsFurther results of FCC Testing Maximum Height = 1.582 4.015 cm Maximum Height = 1.272 3.228 cm Figure C-3 Atto FibreBridge 3200R Connector Layout Appendix D Fibre Channel Resources Cables/Copper Appendix E Fibre Channel AccessoriesField Replacement Units FRU MIAsCables/FibreChain Cables/OpticalCables/SCSI Appendix F How to Contact Atto Technology, Inc
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