SAM introduction
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2012/3/9 2
Introduction
• The purpose of the SCSI architecture model is to: a) Provide a basis for the coordination of SCSI standards development that allows each standard to be placed into perspective within the overall SCSI architecture model; b) Establish a layered model in which standards may be developed; c) Provide a common reference for maintaining consistency among related standards d) Provide the foundation for application compatibility.
ASE Group
2012/3/9
12
The SCSI structural model
The task router routes commands and task management functions as follows: • Commands addressed to a valid logical unit are routed to the task manager in the specified logical unit; • Task management functions with I_T_L nexus scope or I_T_L_Q nexus scope addressed to a valid logical unit are routed to the task manager in the specified logical unit; • Task management functions with an I_T nexus scope are routed to the task manager in each logical unit about which the task router knows; In some transport protocols, the task router may check for overlapped task tags on commands .
ASE Group
2012/3/9
17
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
2012/3/9 16
The service delivery subsystem
The service delivery subsystem connects SCSI ports and is composed of one or more interconnects that appear to a client or server as a single path for the transfer of requests and responses between SCSI devices. The service delivery subsystem is assumed to provide error-free transmission of requests and responses between client and server a) Considered sent by the sender when the sender passes it to the SCSI port for transmission; b) In transit until delivered c) Considered received by the receiver when it has been forwarded to the receiver via the destination SCSI device's SCSI port.
ASE Group
2012/3/9
3
Introduc百度文库ion
• The set of SCSI standards specifies the interfaces, functions, and operations necessary to ensure interoperability between conforming SCSI implementations. • The SCSI architecture model is described in terms of objects , protocol layers, and service interfaces between objects
ASE Group
2012/3/9
13
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
15
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
A member of ASE Group
SAM Introduction
Jam wang
2012/3/9
A member of ASE Group
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
2012/3/9 14
SCSI domain
SCSI domain model
A SCSI device is an object that originates or processes commands and task management functions.
ASE Group
2012/3/9
2012/3/9 9
The SCSI structural model
SCSI I/O system and domain model
ASE Group
2012/3/9
10
The SCSI structural model
Overall SCSI domain model
ASE Group
2012/3/9
ASE Group
2012/3/9
4
Agenda
• Introduction
• The SCSI distributed service model
• • • • • • • • • • •
ASE Group
The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
11
The SCSI structural model
• Application clients are the sources of commands and task management functions. • An application client task is the source for a single command, series of linked commands, or a single task management function.
2012/3/9 5
The SCSI distributed service model
client-server model
ASE Group
2012/3/9
6
Agenda
• • • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Logical unit numbers Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
2012/3/9 7
The SCSI client-server model
SCSI client-server model
ASE Group
2012/3/9
8
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
Introduction
• The purpose of the SCSI architecture model is to: a) Provide a basis for the coordination of SCSI standards development that allows each standard to be placed into perspective within the overall SCSI architecture model; b) Establish a layered model in which standards may be developed; c) Provide a common reference for maintaining consistency among related standards d) Provide the foundation for application compatibility.
ASE Group
2012/3/9
12
The SCSI structural model
The task router routes commands and task management functions as follows: • Commands addressed to a valid logical unit are routed to the task manager in the specified logical unit; • Task management functions with I_T_L nexus scope or I_T_L_Q nexus scope addressed to a valid logical unit are routed to the task manager in the specified logical unit; • Task management functions with an I_T nexus scope are routed to the task manager in each logical unit about which the task router knows; In some transport protocols, the task router may check for overlapped task tags on commands .
ASE Group
2012/3/9
17
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
2012/3/9 16
The service delivery subsystem
The service delivery subsystem connects SCSI ports and is composed of one or more interconnects that appear to a client or server as a single path for the transfer of requests and responses between SCSI devices. The service delivery subsystem is assumed to provide error-free transmission of requests and responses between client and server a) Considered sent by the sender when the sender passes it to the SCSI port for transmission; b) In transit until delivered c) Considered received by the receiver when it has been forwarded to the receiver via the destination SCSI device's SCSI port.
ASE Group
2012/3/9
3
Introduc百度文库ion
• The set of SCSI standards specifies the interfaces, functions, and operations necessary to ensure interoperability between conforming SCSI implementations. • The SCSI architecture model is described in terms of objects , protocol layers, and service interfaces between objects
ASE Group
2012/3/9
13
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
15
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
A member of ASE Group
SAM Introduction
Jam wang
2012/3/9
A member of ASE Group
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
2012/3/9 14
SCSI domain
SCSI domain model
A SCSI device is an object that originates or processes commands and task management functions.
ASE Group
2012/3/9
2012/3/9 9
The SCSI structural model
SCSI I/O system and domain model
ASE Group
2012/3/9
10
The SCSI structural model
Overall SCSI domain model
ASE Group
2012/3/9
ASE Group
2012/3/9
4
Agenda
• Introduction
• The SCSI distributed service model
• • • • • • • • • • •
ASE Group
The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
11
The SCSI structural model
• Application clients are the sources of commands and task management functions. • An application client task is the source for a single command, series of linked commands, or a single task management function.
2012/3/9 5
The SCSI distributed service model
client-server model
ASE Group
2012/3/9
6
Agenda
• • • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Logical unit numbers Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications
2012/3/9 7
The SCSI client-server model
SCSI client-server model
ASE Group
2012/3/9
8
Agenda
• • • • • • • • • • • • •
ASE Group
Introduction The SCSI distributed service model The SCSI client-server model The SCSI structural model SCSI domain The service delivery subsystem SCSI devices Logical units Tasks and task tags The nexus object SCSI ports Model for dependent logical units The SCSI model for distributed communications