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* 출처 - https://tools.ietf.org/html/rfc3720



1. Introduction


iSCSI (Internet Small Computer Systems Interface) 는 SCSI 패킷을 TCP/IP로 감싸 SCSI 장비를 네트워크로 관리할 수 있게 해주는 프로토콜이다.


iSCSI/SCISI 서버를 타겟 (Target), 클라이이언트를 이니시에이터 (Initiator) 라고 부른다.



2. Definitions and Acronyms


(1) Alias : 사용자 편의를 위한 iSCSI 이름 (문자열)


(2) CID (Connection ID) : 타겟과 이니시에이터 사이의 연결 (세션)의 ID. (고유값)


(3) Connection : 타겟과 이니시에이터 사이의 TCP 연결. 컨트롤 메시지, SCSI 커맨드, 파라미터, 데이터를 전달.



3. iSCSI Name Type


(1) iqn (iSCSI Qualified Name)


iSCSI 도메인 네임.


"iqn." 으로 시작


date code는 yyyy-mm 포맷.




4. iSCSI & SCSI Architecture model


4.1. SCSI to iSCSI Concepts Mapping Model



4.2. SCSI Architecture Model




5. Login Phase


5.1. Login Phase Start


-Protocol version supported by the initiator.


-iSCSI Initiator Name and iSCSI Target Name


-ISID, TSIH, and connection Ids


-Negotiation stage that the initiator is ready to enter.



6. Error Handling and Recovery



7. Standard Connection State Diagrams


7.1. State Descriptions for Initiators and Targets


(1) S1 : FREE - instantiation or connection closure 성공 후


(2) S2 : XPT_WAIT - 커넥션 생성 요청 이후 대기상태 (only for Initiator)


(3) S3 : XPT_UP - 로그인 프로세스 대기상태 (only for Target)


(4) S4: IN_LOGIN


- initiator: Waiting for the Login process to conclude, possiblyinvolving several PDU exchanges.


- target: Waiting for the Login process to conclude, possibly involving several PDU exchanges.


(5) S5: LOGGED_IN


- initiator: In Full Feature Phase, waiting for all internal, iSCSI, and transport events.


- target: In Full Feature Phase, waiting for all internal, iSCSI, and transport events.


(6) S6: IN_LOGOUT


- initiator: Waiting for a Logout response.


- target: Waiting for an internal event signaling completion of logout processing.


(7) S7: LOGOUT_REQUESTED


- initiator: Waiting for an internal event signaling readiness to proceed with Logout.


- target: Waiting for the Logout process to start after having requested a Logout via an Async Message.


(8) S8: CLEANUP_WAIT


- initiator : Waiting for the context and/or resources to initiate the cleanup processing for this CSM.


- target : Waiting for the cleanup process to start for this CSM. 

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Posted by 해리팍
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Chanhyun Park (해리팍)
Software Engineer @ SK hynix

Contact Info.
parkch0708@hanmail.net
chanhyun0708@gmail.com
chanhyun.park@sk.com

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