Information technology - Small Computer System Interface (SCSI) - Part 415: SCSI Architecture Model - 5 (SAM-5)

ISO/IEC 14776-415:2019 defines a reference model that specifies common behaviors for SCSI devices, and an abstract structure that is generic to all SCSI I/O system implementations.The set of Small Computer System Interface (SCSI) specifies the interfaces, functions, and operations necessary to ensure interoperability between conforming SCSI implementations. This document is a functional description. Conforming implementations employ any design technique that does not violate interoperability.
The following concepts from previous versions of the SAM standard are made obsolete by this version:
a) support for the SPI-5 SCSI transport protocol;
b) Contingent Allegiance;
c) the TARGET RESET task management function;
d) basic task management model;
e) untagged tasks; and
f) linked command function.

General Information

Status
Published
Publication Date
12-Dec-2019
Current Stage
PPUB - Publication issued
Completion Date
13-Dec-2019
Ref Project

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ISO/IEC 14776-415
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
colour
inside
Information technology – Small Computer System Interface (SCSI) –
Part 415: SCSI Architecture Model - 5 (SAM-5)
ISO/IEC 14776-415:2019-12(en)
---------------------- Page: 1 ----------------------
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ISO/IEC 14776-415
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
colour
inside
Information technology – Small Computer System Interface (SCSI) –
Part 415: SCSI Architecture Model - 5 (SAM-5)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.200 ISBN 978-2-8322-7662-4

Warning! Make sure that you obtained this publication from an authorized distributor.

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ISO/IEC
14776-415
Information technology -
Small Computer System Interface (SCSI) -
Part 415: SCSI Architecture Model - 5 (SAM-5)
Reference number
ISO/IEC 14776-415:2019 © ISO/IEC 2019
Printed Wednesday, October 30, 2019 4:56 pm
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- 2 - ISO/IEC 14776-415:2019 © ISO/IEC 2019

1 Scope........................................................................................................................................................... 15

2 Normative references................................................................................................................................... 15

3 Terms, definitions, symbols, abbreviations, and conventions...................................................................... 15

3.1 Terms and definitions ............................................................................................................................. 15

3.2 Symbols and Abbreviations.................................................................................................................... 30

3.2.1 Abbreviations .................................................................................................................................... 30

3.2.2 Units.................................................................................................................................................. 30

3.3 Keywords................................................................................................................................................ 30

3.4 Editorial conventions .............................................................................................................................. 32

3.5 Numeric and character conventions....................................................................................................... 33

3.5.1 Numeric conventions ........................................................................................................................ 33

3.5.2 Byte encoded character strings conventions .................................................................................... 34

3.6 UML notation conventions...................................................................................................................... 34

3.6.1 Notation conventions overview ......................................................................................................... 34

3.6.2 Constraint and note conventions ...................................................................................................... 34

3.6.3 Class diagram conventions............................................................................................................... 35

3.6.4 Object diagram conventions ............................................................................................................. 40

3.7 State machine conventions .................................................................................................................... 42

3.7.1 State machine conventions overview................................................................................................ 42

3.7.2 Transitions ........................................................................................................................................ 43

3.7.3 Messages, requests, indications, confirmations, responses, and event notifications....................... 43

3.7.4 State machine counters, timers, and variables................................................................................. 44

3.8 Bit and byte ordering .............................................................................................................................. 44

3.9 Notation for procedure calls.................................................................................................................... 46

4 SCSI architecture model .............................................................................................................................. 47

4.1 Overview................................................................................................................................................. 47

4.2 Compliance requirements....................................................................................................................... 47

4.3 The SCSI distributed service model ....................................................................................................... 49

4.4 The SCSI client-server model................................................................................................................. 50

4.4.1 SCSI client-server model overview................................................................................................... 50

4.4.2 Synchronizing client and server changes ......................................................................................... 51

4.4.3 Server request/response ordering .................................................................................................... 51

4.5 The SCSI structural model ..................................................................................................................... 52

4.6 SCSI classes .......................................................................................................................................... 53

4.6.1 SCSI classes overview ..................................................................................................................... 53

4.6.2 SCSI Domain class........................................................................................................................... 54

4.6.3 Service Delivery Subsystem class.................................................................................................... 55

4.6.4 SCSI Device class ............................................................................................................................ 55

4.6.4.1 SCSI Device class overview........................................................................................................ 55

4.6.4.2 SCSI Device Name attribute ....................................................................................................... 56

4.6.5 SCSI Port class................................................................................................................................. 57

4.6.5.1 SCSI Port class overview............................................................................................................ 57

4.6.5.2 Relative Port Identifier attribute................................................................................................... 58

4.6.6 SCSI Target Port class ..................................................................................................................... 58

4.6.6.1 SCSI Target Port class overview................................................................................................. 58

4.6.6.2 Target Port Identifier attribute...................................................................................................... 58

4.6.6.3 Target Port Name attribute.......................................................................................................... 59

4.6.6.4 Send Data-In operation ............................................................................................................... 59

4.6.6.5 Receive Data-Out operation........................................................................................................ 59

4.6.6.6 Terminate Data Transfer operation ............................................................................................. 59

4.6.6.7 Send Command Complete operation.......................................................................................... 59

4.6.6.8 Task Management Function Executed operation........................................................................ 59

4.6.7 Task Router class ............................................................................................................................. 59

4.6.7.1 Task Router class overview ........................................................................................................ 59

4.6.7.2 Route Command operation ......................................................................................................... 60

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ISO/IEC 14776-415:2019 © ISO/IEC 2019 - 3 -

4.6.7.3 Route Task Management Function operation ............................................................................. 60

4.6.7.4 Reroute Conglomerate Command operation .............................................................................. 61

4.6.7.5 Reroute Conglomerate Task Management Functions operation................................................. 61

4.6.7.6 Stop Conglomerate Task Management Functions Rerouting operation ..................................... 62

4.6.8 SCSI Initiator Port class.................................................................................................................... 62

4.6.8.1 SCSI Initiator Port class overview ............................................................................................... 62

4.6.8.2 Initiator Port Identifier attribute .................................................................................................... 63

4.6.8.3 Initiator Port Name attribute ........................................................................................................ 63

4.6.8.4 Send SCSI Command operation................................................................................................. 63

4.6.8.5 Send Task Management Request operation............................................................................... 63

4.6.8.6 Get Initiator Port Identifier operation ........................................................................................... 63

4.6.8.7 Get Initiator Port Name operation................................................................................................ 63

4.6.9 SCSI Target Device class................................................................................................................. 64

4.6.10 Logical Unit Conglomerate class .................................................................................................... 65

4.6.11 Level 1 Hierarchical Logical Unit class ........................................................................................... 66

4.6.12 Level 2 Hierarchical Logical Unit class ........................................................................................... 67

4.6.13 Level 3 Hierarchical Logical Unit class ........................................................................................... 68

4.6.14 Level 4 Hierarchical Logical Unit class ........................................................................................... 68

4.6.15 Hierarchical Logical Unit class........................................................................................................ 68

4.6.16 Management Logical Unit class...................................................................................................... 68

4.6.17 Well Known Logical Unit class........................................................................................................ 69

4.6.18 Logical Unit class............................................................................................................................ 69

4.6.18.1 Logical Unit class overview ....................................................................................................... 69

4.6.18.2 LUN attribute ............................................................................................................................. 71

4.6.18.3 Logical Unit Name attribute....................................................................................................... 71

4.6.18.4 Dependent Logical Unit attribute............................................................................................... 72

4.6.18.5 Device Type attribute ................................................................................................................ 72

4.6.19 Device Server class ........................................................................................................................ 72

4.6.19.1 Device Server class overview ................................................................................................... 72

4.6.19.2 Data-In Delivered operation ...................................................................................................... 72

4.6.19.3 Data-Out Received operation.................................................................................................... 72

4.6.19.4 Data Transfer Terminated operation ......................................................................................... 73

4.6.20 Copy Manager class ....................................................................................................................... 73

4.6.20.1 Copy Manager class overview .................................................................................................. 73

4.6.20.2 Create ROD Token operation.................................................................................................... 73

4.6.20.3 Process ROD Token operation ................................................................................................. 73

4.6.21 Task Manager class........................................................................................................................ 73

4.6.21.1 Task Manager class overview................................................................................................... 73

4.6.21.2 SCSI Command Received operation ........................................................................................ 73

4.6.21.3 Task Management Request Received operation ...................................................................... 74

4.6.21.4 Data Transfer Terminated operation ......................................................................................... 74

4.6.21.5 Nexus Loss operation................................................................................................................ 74

4.6.21.6 Transport Reset operation......................................................................................................... 74

4.6.21.7 Power Loss Expected operation................................................................................................ 74

4.6.22 Task Set class................................................................................................................................. 74

4.6.23 Command class .............................................................................................................................. 74

4.6.23.1 Command class overview ......................................................................................................... 74

4.6.23.2 I_T_L Nexus attribute................................................................................................................ 74

4.6.23.3 Command Identifier attribute..................................................................................................... 75

4.6.23.4 Task Attribute attribute .............................................................................................................. 75

4.6.23.5 CDB attribute............................................................................................................................. 75

4.6.23.6 CRN attribute............................................................................................................................. 75

4.6.23.7 Command Priority attribute........................................................................................................ 75

4.6.23.8 Status attribute .......................................................................................................................... 75

4.6.23.9 Sense Data attribute.................................................................................................................. 75

4.6.23.10 Sense Data Length attribute.................................................................................................... 75

4.6.23.11 Service Response attribute ..................................................................................................... 75

4.6.23.12 Status Qualifier attribute.......................................................................................................... 75

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4.6.23.13 First Burst Enabled attribute.................................................................................................... 75

4.6.23.14 Device Server Buffer attribute ................................................................................................. 75

4.6.23.15 Application Client Buffer Offset attribute ................................................................................. 76

4.6.23.16 Request Byte Count attribute .................................................................................................. 76

4.6.23.17 Delivery Result attribute .......................................................................................................... 76

4.6.24 Task Management Function class .................................................................................................. 76

4.6.24.1 Task Management Function class overview ............................................................................. 76

4.6.24.2 Function Identifier attribute........................................................................................................ 76

4.6.24.3 I_T Nexus attribute.................................................................................................................... 76

4.6.24.4 I_T_L Nexus attribute................................................................................................................ 76

4.6.24.5 Command Identifier attribute..................................................................................................... 76

4.6.24.6 Service Response attribute ....................................................................................................... 76

4.6.24.7 Additional Response Information attribute ................................................................................ 77

4.6.25 Administrative Logical Unit class .................................................................................................... 77

4.6.25.1 Administrative Logical Unit class overview................................................................................ 77

4.6.25.2 Rerouted commands and task management functions............................................................. 77

4.6.25.2.1 Overview.............................................................................................................................. 77

4.6.25.2.2 Commands rerouted due to incorrect logical unit selection................................................. 77

4.6.25.2.3 Command rerouting in response to an administrative logical unit request .......................... 77

4.6.25.2.4 Task management function rerouting in response to an administrative logical unit request 78

4.6.26 Subsidiary Logical Unit class .......................................................................................................... 79

4.6.26.1 Subsidiary Logical Unit class overview ..................................................................................... 79

4.6.26.2 Binding attribute ........................................................................................................................ 79

4.6.26.3 Host Bind Identifier attribute...................................................................................................... 79

4.6.27 SCSI Initiator Device class.............................................................................................................. 80

4.6.28 Application Client class................................................................................................................... 81

4.6.28.1 Application Client class overview .............................................................................................. 81

4.6.28.2 Command Complete Received operation ................................................................................. 81

4.6.28.3 Received Task Management Function Executed operation...................................................... 81

4.6.28.4 Nexus Loss operation................................................................................................................ 82

4.6.28.5 Transport Reset operation......................................................................................................... 82

4.6.29 Application Client Task Management Function class ..................................................................... 82

4.6.29.1 Application Client Task Management Function class overview................................................. 82

4.6.29.2 Function Identifier attribute........................................................................................................ 82

4.6.29.3 I_T Nexus attribute.................................................................................................................... 82

4.6.29.4 I_T_L Nexus attribute................................................................................................................ 82

4.6.29.5 Command Identifier attribute..................................................................................................... 82

4.6.29.6 Service Response attribute ....................................................................................................... 82

4.6.29.7 Additional Response Information attribute ................................................................................ 82

4.6.30 Application Client Task Set class.................................................................................................... 83

4.6.31 Application Client Command class ................................................................................................. 83

4.6.31.1 Application Client Command class overview.............................................................................83

4.6.31.2 I_T_L Nexus attribute................................................................................................................ 83

4.6.31.3 Command Identifier attribute..................................................................................................... 83

4.6.31.4 CDB attribute............................................................................................................................. 84

4.6.31.5 Task Attribute attribute .............................................................................................................. 84

4.6.31.6 Status attribute .......................................................................................................................... 84

4.6.31.7 Service Response attribute ....................................................................................................... 84

4.6.31.8 Data-In Buffer attribute.............................................................................................................. 84

4.6.31.9 Data-In Buffer Size attribute...................................................................................................... 84

4.6.31.10 Data-Out Buffer attribute ......................................................................................................... 85

4.6.31.11 Data-Out Buffer Size attribute ................................................................................................. 85

4.6.31.12 CRN attribute........................................................................................................................... 85

4.6.31.13 Command Priority attribute...................................................................................................... 85

4.6.31.14 First Burst Enabled attribute.................................................................................................... 85

4.6.31.15 Sense Data attribute................................................................................................................ 85

4.6.31.16 Sense Data Length attribute.................................................................................................... 85

4.6.31.17 Status Qualifier attribute.......................................................................................................... 85

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ISO/IEC 14776-415:2019 © ISO/IEC 2019 - 5 -

4.6.32 Discovery class............................................................................................................................... 85

4.6.32.1 Discovery class overview .......................................................................................................... 85

4.6.32.2 I_T Nexus attribute.................................................................................................................... 86

4.6.32.3 I_T_L Nexus attribute................................................................................................................ 86

4.6.32.4 Return I_T Nexus operation ...................................................................................................... 86

4.6.32.5 Return I_T_L Nexus operation .................................................................................................. 86

4.7 Logical unit number (LUN)...................................................................................................................... 86

4.7.1 Overview........................................................................................................................................... 86

4.7.2 Logical unit representation format..................................................................................................... 87

4.7.3 LUNs overview.................................................................................................................................. 87

4.7.4 Minimum LUN addressing requirements......................................
...

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