The SCSI protocol has been mapped over various transports, including Parallel SCSI, IPI, IEEE-1394 (firewire) and Fibre Channel. These transports are I/O specific and have limited distance capabilities.
SCSI 協定是映射了若幹的傳輸協定，包括并行SCSI,IPI,IEEE-1394和FC協定。這些傳輸協定有特定的I/O和距離限制因素。
The iSCSI protocol defined in this document describes a means of
transporting SCSI packets over TCP/IP (see [RFC791], [RFC793],
[RFC1035], [RFC1122]), providing for an interoperable solution which
can take advantage of existing Internet infrastructure, Internet
management facilities, and address distance limitations.
iSCSI協定定義在這個文檔中描述一種手段傳輸SCSI包通過TCP/IP,提供一個共同的方案，利用已存在的Internet基礎、管理情況和位址距離限制。
2. Definitions and Acronyms 定義和縮寫
2.1 Definitions 定義
- Alias: An alias string can also be associated with an iSCSI Node.
The alias allows an organization to associate a user-friendly
string with the iSCSI Name. However, the alias string is not a
substitute for the iSCSI Name.
别名：别名字元串可以用來關聯一個iSCSI節點。别名允許一個組織去關聯一個使用者友好的字元串iSCSI名字。當然這個别名字元串不能替代iSCSI節點名。
- CID (Connection ID): Connections within a session are identified by a connection ID. It is a unique ID for this connection within the session for the initiator. It is generated by the initiator and presented to the target during login requests and during logouts that close connections.
CID(連接配接ID)：連接配接包含在一個session中，被定義為一個連接配接ID。它是唯一的ID為了這個連接配接到啟動裝置的session。它産生于啟動裝置和被介紹給目标裝置，在注冊請求期間和關閉連接配接的退出請求期間。
- Connection: A connection is a TCP connection. Communication between the initiator and target occurs over one or more TCP connections. The TCP connections carry control messages, SCSI commands, parameters, and data within iSCSI Protocol Data Units (iSCSI PDUs).
連接配接: 連接配接時一個TCP連接配接。消息在啟動裝置和目标裝置之間出現通過TCP連接配接方式。這個TCP連接配接包括控制資訊、SCSI指令、參數和包含iSCSI協定資料機關的資料。
- iSCSI Device: A SCSI Device using an iSCSI service delivery subsystem. Service Delivery Subsystem is defined by [SAM2] as a transport mechanism for SCSI commands and responses.
iSCSI裝置：SCSI裝置使用iSCSI服務投遞子系統。投遞子系統服務定義在傳輸機器為了SCSI指令和請求。
- iSCSI Initiator Name: The iSCSI Initiator Name specifies the worldwide unique name of the initiator.
iSCSI 啟動裝置名：這個iSCSI啟動裝置名指定全世界獨一無二的名字給這個啟動裝置。
- iSCSI Initiator Node: The "initiator". The word "initiator" has been appropriately qualified as either a port or a device in the rest of the document when the context is ambiguous. All unqualified usages of "initiator" refer to an initiator port (or device) depending on the context.
- iSCSI Layer: This layer builds/receives iSCSI PDUs and relays/receives them to/from one or more TCP connections that form an initiator-target "session".
iSCSI層：層建立/接收 iSCSI協定資料單元，轉發/接收它們從/到一個或多個TCP連接配接在從啟動裝置和目标裝置之間的會話。
- iSCSI Name: The name of an iSCSI initiator or iSCSI target.
iSCSI名：名字在啟動裝置或目标裝置。
- iSCSI Node: The iSCSI Node represents a single iSCSI initiator or iSCSI target. There are one or more iSCSI Nodes within a Network Entity. The iSCSI Node is accessible via one or more Network Portals. An iSCSI Node is identified by its iSCSI Name. The separation of the iSCSI Name from the addresses used by and for the iSCSI Node allows multiple iSCSI Nodes to use the same address, and the same iSCSI Node to use multiple addresses.
iSCSI節點：iSCSI節點描述一個單一的iSCSI啟動裝置或iSCSI目标裝置。一個或者更多的節點在一個網絡實體中。節點是可通路的通過一個或者更多的網絡入口。一個節點被定義為它的iSCSI名稱。iSCSI名字的分離從使用的位址for iscsi節點，允許多個節點去使用一樣的位址，同時一樣的節點使用多個位址。
- iSCSI Target Name: The iSCSI Target Name specifies the worldwide unique name of the target.
iSCSI 目标裝置名： iSCSI目标裝置名描述一個全世界唯一的名字給這個裝置。
- iSCSI Target Node: The "target".
iSCSI 目标裝置節點：又叫“目标裝置”
- iSCSI Task: An iSCSI task is an iSCSI request for which a response is expected.
iSCSI任務：一個iSCSI任務是一個iSCSI請求，被期望的回答。
- iSCSI Transfer Direction: The iSCSI transfer direction is defined with regard to the initiator. Outbound or outgoing transfers are transfers from the initiator to the target, while inbound or incoming transfers are from the target to the initiator.
iCSCI傳輸方向：iCSCI傳輸方向定義關于啟動裝置。出站或者傳出傳輸是從啟動裝置到目标裝置的傳輸，同時入站或者進站傳輸是從目标裝置到啟動裝置的傳輸。
- ISID: The initiator part of the Session Identifier. It is explicitly specified by the initiator during Login.
ISID: 啟動裝置角色的會話辨別符。在啟動裝置注冊期間被明确地定義。
- I_T nexus: According to [SAM2], the I_T nexus is a relationship between a SCSI Initiator Port and a SCSI Target Port. For iSCSI, this relationship is a session, defined as a relationship between an iSCSI Initiator's end of the session (SCSI Initiator Port) and the iSCSI Target's Portal Group. The I_T nexus can be identified by the conjunction of the SCSI port names; that is, the I_T nexus identifier is the tuple (iSCSI Initiator Name + ',i,'+ ISID, iSCSI Target Name + ',t,'+ Portal Group Tag).
I_T nexus：根據[SAM2]，I_T nexus是一種關系在SCSI啟動裝置角色和SCSI目标裝置角色之間産生。對于iSCSI，這種關系是一個會話，定義類似關系在啟動裝置會話的結尾部分（SCSI啟動裝置角色）和iSCSI目标裝置的入口組（SCSI目标裝置角色）。I_T nexus 可以被支援在SCSI角色名的連接配接，就是說，這個I_T nexus标記是一組資料(iSCSI Initiator Name + ',i,'+ ISID, iSCSI Target Name + ',t,'+ Portal Group Tag).
Network Entity: The Network Entity represents a device or gateway that is accessible from the IP network. A Network Entity must have one or more Network Portals, each of which can be used to gain access to the IP network by some iSCSI Nodes contained in that Network Entity.
網絡團體：網絡團體表現為可通過IP網絡通路的一個驅動或者網關。一個網絡團體必須有一個或者多個網絡入口，，每一個都可以使用，通過IP網絡通路到一些iSCSI節點容器在網絡團體中。
- Network Portal: The Network Portal is a component of a Network Entity that has a TCP/IP network address and that may be used by an iSCSI Node within that Network Entity for the connection(s) within one of its iSCSI sessions. A Network Portal in an initiator is identified by its IP address. A Network Portal in a target is identified by its IP address and its listening TCP port.
網絡入口：網絡如後是一個網絡團隊的元件，有一個TCP/IP的網絡位址可以使用給一個iSCSI節點，在一個ISCSI會話中提供連接配接。一個網絡如後在啟動裝置中間被識别為一個IP位址。一個網絡入口在目标裝置被識别為一個IP位址+監聽端口。
- Originator: In a negotiation or exchange, the party that initiates the negotiation or exchange.
發起人：在一個協商或交換中，協商或發起的啟動裝置一方。
- PDU (Protocol Data Unit): The initiator and target divide their communications into messages. The term "iSCSI protocol data unit" (iSCSI PDU) is used for these messages.
PDU，協定資料單元。啟動裝置和目标裝置分割他們的通訊到消息中。
- Portal Groups: iSCSI supports multiple connections within the same session; some implementations will have the ability to combine connections in a session across multiple Network Portals. A Portal Group defines a set of Network Portals within an iSCSI Network Entity that collectively supports the capability of coordinating a session with connections spanning these portals. Not all Network Portals within a Portal Group need participate in every session connected through that Portal Group. One or more Portal Groups may provide access to an iSCSI Node. Each Network Portal, as utilized by a given iSCSI Node, belongs to exactly one portal group within that node.
入口組：iSCSI支援多重連接配接在一個同樣的會話中。部分實施将有能力結合連接配接在一個會話中通路多個網絡接口。一個入口組定義了一套網絡入口在一個iSCSI網絡團體。
- Portal Group Tag: This 16-bit quantity identifies a Portal Group within an iSCSI Node. All Network Portals with the same portal group tag in the context of a given iSCSI Node are in the same Portal Group.
入口組标簽：這16位元組大小識别一個入口組在一個iSCSI節點。所有的網絡入口具有一樣的入口組标簽在一個給定iSCSI節點的上下文中是一樣的入口組。
- Recovery R2T: An R2T generated by a target upon detecting the loss of one or more Data-Out PDUs through one of the following means: a digest error, a sequence error, or a sequence reception timeout. A recovery R2T carries the next unused R2TSN, but requests all or part of the data burst that an earlier R2T (with a lower R2TSN) had already requested.
- Responder: In a negotiation or exchange, the party that responds to the originator of the negotiation or exchange.
應答：
- SCSI Device: This is the SAM2 term for an entity that contains one or more SCSI ports that are connected to a service delivery subsystem and supports a SCSI application protocol. For example, a SCSI Initiator Device contains one or more SCSI Initiator Ports and zero or more application clients. A Target Device contains one or more SCSI Target Ports and one or more device servers and associated logical units. For iSCSI, the SCSI Device is the component within an iSCSI Node that provides the SCSI functionality. As such, there can be at most, one SCSI Device within a given iSCSI Node. Access to the SCSI Device can only be achieved in an iSCSI normal operational session. The SCSI Device Name is defined to be the iSCSI Name of the node.
SCSI裝置
- SCSI Layer: This builds/receives SCSI CDBs (Command Descriptor Blocks) and relays/receives them with the remaining command execute [SAM2] parameters to/from the iSCSI Layer.
SCSI标簽
- Session: The group of TCP connections that link an initiator with a target form a session (loosely equivalent to a SCSI I-T nexus). TCP connections can be added and removed from a session. Across all connections within a session, an initiator sees one and the same target.
會話
- SCSI Initiator Port: This maps to the endpoint of an iSCSI normal operational session. An iSCSI normal operational session is negotiated through the login process between an iSCSI initiator node and an iSCSI target node. At successful completion of this process, a SCSI Initiator Port is created within the SCSI Initiator Device. The SCSI Initiator Port Name and SCSI Initiator Port Identifier are both defined to be the iSCSI Initiator Name together with (a) a label that identifies it as an initiator port name/identifier and (b) the ISID portion of the session identifier.
SCSI 啟動端口
- SCSI Port: This is the SAM2 term for an entity in a SCSI Device that provides the SCSI functionality to interface with a service delivery subsystem. For iSCSI, the definition of the SCSI Initiator Port and the SCSI Target Port are different.
SCSI端口：
- SCSI Port Name: A name made up as UTF-8 [RFC2279] characters and includes the iSCSI Name + 'i' or 't' + ISID or Portal Group Tag.
SCSI端口名：一個名子字制作成UTF-8字元，包含iSCSI名+‘i’或’t’+ISID 或者入口組标簽。
- SCSI Target Port: This maps to an iSCSI Target Portal Group.
SCIS目标端口：這映射到一個iSCSI目标入口組。
- SCSI Target Port Name and SCSI Target Port Identifier: These are both defined to be the iSCSI Target Name together with (a) a label that identifies it as a target port name/identifier and (b) the portal group tag.
SCSI目标端口名和SCSI目标端口認證：這裡同時有兩種定義這個iSCSI目标名。1.一個标簽識别它作為一個目标端口名/驗證。2.入口組标簽。
- SSID (Session ID): A session between an iSCSI initiator and an iSCSI target is defined by a session ID that is a tuple composed of an initiator part (ISID) and a target part (Target Portal Group Tag). The ISID is explicitly specified by the initiator at session establishment. The Target Portal Group Tag is implied by the initiator through the selection of the TCP endpoint at connection establishment. The TargetPortalGroupTag key must also be returned by the target as a confirmation during connection establishment when TargetName is given.
SSID(會話ID): 一個會話在iSCSI啟動裝置和iSCSI目标兩者之間被定義為一個會話ID. 是由一個啟動裝置角色（ISID）和一個目标裝置角色（Target Portal Group Tag）組成的一個數組。這個ISID是一個明确的規定啟動裝置會話建立。這個目标入口組标簽鍵值也應該傳回目标裝置，當目标名稱被設定時，目标裝置認可在連接配接建立中。
- Target Portal Group Tag: A numerical identifier (16-bit) for an iSCSI Target Portal Group.
目标入口組标簽：一個數字驗證，16位元組給一個iSCSI 目标入口組
- TSIH (Target Session Identifying Handle): A target assigned tag for a session with a specific named initiator. The target generates it during session establishment. Its internal format and content are not defined by this protocol, except for the value 0 that is reserved and used by the initiator to indicate a new session. It is given to the target during additional connection establishment for the same session.
TSIH(目标會話識别句柄)：一個目标配置設定标簽為了一個制定了名字的啟動會話。這個目标産生在會話的連接配接期間。它的内部格式和内容沒有定義在這個協定，出了變量0以外，變量0被保留使用在啟動裝置去标示一個新的會話。它是規定，目标增加連接配接的建立給一樣的會話。
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實在實在搞不下去，搞不下去了，英語太差勁了。~~
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2.2. Acronyms 縮寫
Acronym Definition
------------------------------------------------------------
3DES ：Triple Data Encryption Standard 三倍資料加密标準
ACA：Auto Contingent Allegiance
AEN :Asynchronous Event Notification 異步事件通知
AES： Advanced Encryption Standard 超強加密标準
AH： Additional Header (not the IPsec AH!) 增加頭
AHS： Additional Header Segment 增加頭部片段
API ：Application Programming Interface 應用程式接口
ASC： Additional Sense Code 增加辨識碼
ASCII： American Standard Code for Information Interchange
ASCQ ：Additional Sense Code Qualifier
BHS ：Basic Header Segment 基礎頭片段
CBC： Cipher Block Chaining 加密塊鍊模式
CD ：Compact Disk 協定盤
CDB :Command Descriptor Block 指令描述塊
CHAP ：Challenge Handshake Authentication Protocol 詢問握手認證協定
CID： Connection ID 連接配接ID
CO : Connection Only 僅連接配接
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