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There are three type of SCSI ports: initiator ports, target ports and target/initiator ports. A SCSI device may contain any combination of initiator ports, target ports and target/initiator ports.
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devices communicate. It is intended to show how the different SCSI standards are inter-related. The main concepts and terminology of the SCSI architectural model are:
216:. It consists of the services, signaling mechanism and interconnect subsystem used for the physical transfer of data from an initiator to a target.
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The relationship between SCSI devices is described by a client-server service-delivery model. The client is called a
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which must be unique within the SCSI domain in which the SCSI device has SCSI ports. This is often called a
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s embedded within it. This can recur up to a maximum nesting depth of four addressable levels.
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177:(STPL) is where an initiator and a target are considered to communicate using a
123:. Note that the "world" may only consist of a very small number of SCSI devices.
89:, at least one SCSI target and at least one SCSI initiator interconnected by a
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212:(SIL) where an initiator and a target are considered to communicate using an
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162:(SAL) where an initiator and a target are considered to communicate using
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Only the externally observable behavior is defined in SCSI standards.
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is represented by an I_T_L_Q nexus. This is where one
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are considered to communicate in a three layer model:
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UN and together they execute one task (identified by
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181:. Examples of SCSI transport protocols are
59:provides an abstract view of the way that
158:The highest level of abstraction is the
100:, and a SCSI port may have an optional
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126:A SCSI target consists of one or more
115:A SCSI device can have an optional
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259:– list of all SCSI standards
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130:(LUNs), which are identified by
96:A SCSI device has one or more
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175:SCSI Transport Protocol Layer
34:SCSI Transport Protocol Layer
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233:arget Port, addressing one
229:nitiator Port talks to one
74:and the server is called a
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91:service delivery subsystem
168:SCSI application protocol
85:consists of at least one
252:SCSI architectural model
208:The lowest level is the
57:SCSI architectural model
19:SCSI architectural model
257:T10 Technical Committee
210:SCSI Interconnect Layer
203:SCSI Parallel Interface
179:SCSI transport protocol
44:SCSI Interconnect Layer
160:SCSI Application Layer
24:SCSI Application Layer
132:logical unit numbers
102:SCSI port identifier
153:distributed objects
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117:SCSI device name
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121:World Wide Name
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246:External links
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72:SCSI initiator
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183:Fibre Channel
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166:sent via the
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164:SCSI commands
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143:dependent LUN
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214:interconnect
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87:SCSI device
83:SCSI domain
76:SCSI target
98:SCSI ports
223:SCSI task
141:may have
267:Category
201:and the
104:(SCSI
199:iSCSI
151:SCSI
273:SCSI
173:The
61:SCSI
55:The
39:STPL
195:UAS
191:SAS
187:SSA
139:LUN
110:PID
108:or
49:SIL
29:SAL
269::
241:).
221:A
197:,
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137:A
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106:ID
81:A
239:Q
235:L
231:T
227:I
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