ISO/IEC 14776-223:2008

ISO/IEC 14776-223
Edition 1.0 2008-05
INTERNATIONAL
STANDARD
Information technology –
Small computer system interface (SCSI) –
Part 223: Fibre channel protocol, third version (FCP-3)

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ISO/IEC 14776-223
Edition 1.0 2008-05
INTERNATIONAL
STANDARD
Information technology –
Small computer system interface (SCSI) –
Part 223: Fibre channel protocol, third version (FCP-3)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XB
ICS 35.200 ISBN 2-8318-9817-X
FDIS 14776-223 © ISO/IEC:2008 - 3 -
14776-223 © ISO/IEC:2008(E) – 3 –
FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3 Definitions, abbreviations and conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1 Terms and definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3 Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.4 Editorial conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1 Structure and concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2 FCP I/O operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3 Bidirectional and unidirectional commands and FCP_RSP IU format . . . . . . . . . . . . . . 25
4.4 Precise delivery of SCSI commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.5 Confirmed completion of FCP I/O operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.6 Retransmission of unsuccessfully transmitted IUs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.7 Task retry identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.8 Discovery of FCP capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.9 Task management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.10 Clearing effects of task management, FCP, FC-FS-2, FC-LS, and FC-AL-2 actions . . 29
4.11 I_T nexus loss notification events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.12 Transport Reset notification events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.13 Port Login/Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.14 Process Login and Process Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.15 Link management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.16 FCP addressing and Exchange identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.17 Use of World Wide Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5 FC-FS-2 frame header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.1 FC-FS-2 frame header overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2 FC-FS-2 frame header fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.1 r_ctl field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.2 d_id field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.3 cs_ctl field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.4 s_id field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.5 type field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2.6 f_ctl field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.7 seq_id field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.8 df_ctl field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.9 seq_cnt field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.10 ox_id field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.11 rx_id field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.12 parameter field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6 FCP link service definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.1 Overview of link service requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.2 Overview of Process Login and Process Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.3 PRLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3.1 Use of PRLI by the Fibre Channel Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3.2 Process_Associator requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3.3 New or repeated Process Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3.4 PRLI request FCP Service Parameter page format . . . . . . . . . . . . . . . . . . . . . . . . 37

- 4 - FDIS 14776-223 © ISO/IEC:2008
– 4 – 14776-223 © ISO/IEC:2008(E)
6.3.5 PRLI accept FCP Service Parameter page format . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.4 PRLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.5 Read Exchange Concise (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7 FC-4 specific Name Server registration and objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.1 Overview of FC-4 specific objects for the Fibre Channel Protocol . . . . . . . . . . . . . . . . . 42
7.2 FC-4 TYPEs object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.3 FC-4 Features object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8 FC-4 Link Service definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.1 FC-4 Link Services for the Fibre Channel Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.2 Sequence Retransmission Request (SRR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.3 FCP FC-4 Link Service Reject (FCP_RJT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9 FCP Information Unit (IU) usage and formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.1 FCP Information Unit (IU) usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.2 FCP_CMND IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.2.1 Overview and format of FCP_CMND IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.2.2 FCP_CMND IU field descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.2.2.1 fcp_lun field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.2.2.2 COMMAND REFERENCE NUMBER field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.2.2.3 priority field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.2.2.4 task attribute field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.2.2.5 TASK MANAGEMENT FLAGS FIELD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.2.2.6 additional fcp_cdb length field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.2.2.7 rddata and wrdata bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.2.2.8 fcp_cdb field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.2.2.9 additional_fcp_cdb field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.2.2.10 fcp_dl field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.2.2.11 fcp_bidirectional_read_dl field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.3 FCP_XFER_RDY IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.3.1 Overview and format of FCP_XFER_RDY IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.3.2 fcp_data_ro field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.3.3 fcp_burst_len field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.4 FCP_DATA IU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.4.1 FCP_DATA IU overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.4.2 FCP_DATA IUs for read and write operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.4.3 FCP_DATA IUs for bidirectional commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.4.4 FCP_DATA IU use of fill bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
9.5 FCP_RSP IU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
9.5.1 Overview and format of FCP_RSP IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
9.5.2 retry delay timer field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.3 fcp_bidi_rsp bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.4 fcp_bidi_read_resid_under bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.5 fcp_bidi_read_resid_over bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.6 FCP_CONF_REQ BIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.7 fcp_resid_under bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.8 fcp_resid_over bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.9 fcp_sns_len_valid bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.10 fcp_rsp_len_valid bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.5.11 SCSI status code field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.5.12 fcp_resid field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.5.13 fcp_bidirectional_read_resid field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

FDIS 14776-223 © ISO/IEC:2008 - 5 -
14776-223 © ISO/IEC:2008(E) – 5 –
9.5.14 fcp_sns_len field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.5.15 fcp_rsp_len field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.5.16 fcp_rsp_info field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.5.17 fcp_sns_info field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9.6 FCP_CONF IU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
10 SCSI mode parameters for the Fibre Channel Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.1 Overview of mode pages for the Fibre Channel Protocol . . . . . . . . . . . . . . . . . . . . . . . 64
10.2 Disconnect-Reconnect mode page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
10.2.1 Overview and format of Disconnect-Reconnect mode page for FCP . . . . . . . . . . 64
10.2.2 buffer full ratio field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
10.2.3 buffer empty ratio field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
10.2.4 bus inactivity limit field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.2.5 disconnect time limit field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.2.6 connect time limit field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.2.7 maximum burst size field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.2.8 emdp bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.2.9 FAA, FAB, FAC BITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.2.10 first burst size field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.3 Fibre Channel Logical Unit Control mode page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10.4 Fibre Channel Port Control mode page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10.4.1 Overview and format of Fibre Channel Port Control mode page . . . . . . . . . . . . . 68
10.4.2 DISABLE TARGET ORIGINATED LOOP INITIALIZATION (DTOLI) bit . . . . . . . . . . . . . . . . . 69
10.4.3 DISABLE TARGET INITIATED PORT ENABLE (DTIPE) bit . . . . . . . . . . . . . . . . . . . . . . . . 69
10.4.4 ALLOW LOGIN WITHOUT LOOP INITIALIZATION (ALWLI) bit . . . . . . . . . . . . . . . . . . . . . . 69
10.4.5 REQUIRE HARD ADDRESS (RHA) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.4.6 disable loop master (dlm) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.4.7 DISABLE DISCOVERY (DDIS) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.4.8 PREVENT LOOP PORT BYPASS (PLPB) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.4.9 DISABLE TARGET FABRIC DISCOVERY (DTFD) bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.4.10 sequence initiative resource recovery timeout value (rr_tovseq_init) field . . . . . 71
11 Timers for FCP operation and recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
11.1 Summary of timers for the Fibre Channel Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
11.2 Error_Detect Timeout (E_D_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
11.3 Resource Allocation Timeout (R_A_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
11.4 Resource Recovery Timeout (RR_TOV). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
11.5 Read Exchange Concise Timeout Value (REC_TOV) . . . . . . . . . . . . . . . . . . . . . . . . . 73
11.6 Upper Level Protocol Timeout (ULP_TOV). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
12 Link error detection and error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
12.1 Error detection and error recovery overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
12.1.1 Exchange level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
12.1.2 Sequence level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
12.2 FCP error detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
12.2.1 Overview of FCP-3 error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
12.2.2 FCP-3 error detection using protocol errors for all classes of service . . . . . . . . . 75
12.2.3 Error detection mechanisms for acknowledged classes of service . . . . . . . . . . . 76
12.3 Exchange level recovery using recovery abort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
12.3.1 Recovery abort overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
12.3.2 Initiator FCP_Port invocation of recovery abort . . . . . . . . . . . . . . . . . . . . . . . . . . 77
12.3.3 Target FCP_Port response to recovery abort . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
12.3.4 Additional error recovery by initiator FCP_Port . . . . . . . . . . . . . . . . . . . . . . . . . . 78

- 6 - FDIS 14776-223 © ISO/IEC:2008
– 6 – 14776-223 © ISO/IEC:2008(E)
12.3.5 Additional error recovery by target FCP_Port . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
12.4 Sequence level error detection and recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
12.4.1 Using information from REC to perform Sequence level recovery . . . . . . . . . . . . 78
12.4.1.1 Polling Exchange state with REC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
12.4.1.2 Detection of errors while polling with REC . . . . . . . . . . . . . . . . . . . . . . . . . . 79
12.4.1.3 FCP_CMND IU recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
12.4.1.4 FCP_XFER_RDY IU recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
12.4.1.5 FCP_RSP IU recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
12.4.1.6 FCP_DATA IU recovery - write operations . . . . . . . . . . . . . . . . . . . . . . . . . . 80
12.4.1.7 FCP_DATA IU recovery - read operations . . . . . . . . . . . . . . . . . . . . . . . . . . 81
12.4.1.8 FCP_CONF IU recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
12.4.2 Additional error recovery requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12.4.2.1 Error indicated in ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12.4.2.2 Missing ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12.4.2.3 Distinguishing Exchange to be aborted . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12.5 Second-level error recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12.5.1 ABTS error recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12.5.2 REC error recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.5.3 SRR error recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12.6 Responses to FCP type frames before PLOGI or PRLI . . . . . . . . . . . . . . . . . . . . . . . . 83
Annex A - FCP-3 mapping to SAM-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
A.1 Definition of procedure terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Annex B - FCP examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
B.1 Examples of the use of FCP Information Units (IUs) . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
B.1.1 Overview of examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
B.1.2 SCSI FCP read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
B.1.3 SCSI FCP write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
B.1.4 SCSI FCP operation with no data transfer or with check condition . . . . . . . . . . . . 87
B.1.5 SCSI FCP read operation with multiple FCP_DATA IUs . . . . . . . . . . . . . . . . . . . . 88
B.1.6 SCSI FCP write operation with FCP_XFR_RDY disabled . . . . . . . . . . . . . . . . . . . 88
B.1.7 SCSI FCP bidirectional command with write before read . . . . . . . . . . . . . . . . . . . 89
B.1.8 SCSI FCP bidirectional command with read before write . . . . . . . . . . . . . . . . . . . 89
B.1.9 SCSI FCP bidirectional command, write first, write FCP_XFER_RDY disabled . . 90
B.1.10 SCSI FCP bidirectional command with intermixed writes and reads . . . . . . . . . . 91
B.1.11 SCSI linked commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
B.1.12 SCSI WRITE command with confirmed completion . . . . . . . . . . . . . . . . . . . . . . . 93
B.1.13 SCSI FCP task management function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
B.2 FCP write example, frame level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
B.3 FCP read example, frame level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Annex C - Error detection and recovery action examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
C.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Annex D - FCP Device Discovery Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
D.1 FCP Device Discovery Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
D.1.1 Initiator discovery of Fabric-attached target FCP_Ports . . . . . . . . . . . . . . . . . . . 132
D.1.2 Initiator discovery of loop-attached target FCP_Ports . . . . . . . . . . . . . . . . . . . . . 132
D.2 Fabric and Device Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
D.3 Logical unit authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Annex E - FCP-3 examples of link service usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
E.1 Formats for recovery link services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
E.2 Abort Sequence (ABTS) Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

FDIS 14776-223 © ISO/IEC:2008 - 7 -
14776-223 © ISO/IEC:2008(E) – 7 –
E.2.1 Abort Sequence (ABTS) Request fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
E.2.2 Basic Accept (BA_ACC) Frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
E.2.3 Basic Reject (BA_RJT) Frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
E.3 Reinstate Recovery Qualifier (RRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
E.3.1 RRQ request format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

- 8 - FDIS 14776-223 © ISO/IEC:2008
– 8 – 14776-223 © ISO/IEC:2008(E)
Table 1 - SCSI and Fibre Channel Protocol functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 2 - Discovery of FCP-3 capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 3 - Task management functions, SAM-3 to FCP-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 4 - Clearing effects of link related functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 5 - Clearing effects of initiator FCP_Port actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 6 - FCP frame header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 7 - FCP Service Parameter page, PRLI request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 8 - FCP Service Parameter page, PRLI accept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 9 - FCP definition of FC-4 Feature bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 10 - FCP FC-4 Link Service Requests and Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 11 - SRR Payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 12 - SRR Accept Payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 13 - FCP_RJT Payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 14 - FCP_RJT reason codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 15 - FCP_RJT reason code explanations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 16 - FCP Information Units (IUs) sent to target FCP_Ports . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 17 - FCP Information Units (IUs) sent to initiator FCP_Ports . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 18 - FCP_CMND IU Payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 19 - TASK ATTRIBUTE field values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 20 - task management flags field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 21 - FCP_XFER_RDY IU payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 22 - FCP_RSP IU Payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 23 - FCP_RSP_INFO field format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 24 - RSP_CODE definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 25 - Mode pages for FCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 26 - Disconnect-Reconnect mode page (02h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 27 - Fibre Channel Logical Unit Control mode page (18h) . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 28 - Fibre Channel Port Control mode page (19h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 29 - Values for RR_TOV UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Table 30 - Timer summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Table 31 - Initiator FCP_Port REC_TOV Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 32 - Target FCP_Port REC_TOV usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table A.1 - FCP-3 procedure terms mapped to terms from SAM-3 standard . . . . . . . . . . . . . . . . 84
Table A.2 - Procedure terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Table B.1 - FCP read operation, example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Table B.2 - FCP write operation, example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Table B.3 - FCP operation without data transfer, example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Table B.4 - FCP read operation, example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table B.5 - FCP write operation with FCP_XFER_RDY disabled, example . . . . . . . . . . . . . . . . . . 88
Table B.6 - FCP bidirectional command with write before read, example . . . . . . . . . . . . . . . . . . . 89
Table B.7 - FCP bidirectional command with read before write, example . . . . . . . . . . . . . . . . . . . 89
Table B.8 - FCP bidirectional command, write FCP_XFER_RDY disabled, example . . . . . . . . . . 90
Table B.9 - FCP bidirectional command with intermixed writes and reads, example . . . . . . . . . . . 91
Table B.10 - FCP linked commands, example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table B.11 - FCP write command with confirmed completion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table B.12 - FCP task management function, example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table C.1 - Diagram Drawing Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Table E.2 - BA_ACC Frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Table E.3 - BA_RJT Frame to ABTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Table E.4 - Reinstate Recovery Qualifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

FDIS 14776-223 © ISO/IEC:2008 - 9 -
14776-223 © ISO/IEC:2008(E) – 9 –
Figure B.1 - Example of class 2 FCP write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Figure B.2 - Example of class 2 FCP_DATA write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Figure B.3 - Example of class 2 FCP read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Figure B.4 - Example of class 2 FCP_DATA read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Figure C.1 - Lengthy FCP_CMND or Lost ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure C.2 - FCP_CMND Lost, Unacknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Figure C.3 - FCP_CMND Lost, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Figure C.4 - FCP_CMND Acknowledgement Lost, Acknowledged Classes . . . . . . . . . . . . . . 102
Figure C.5 - FCP_XFER_RDY Lost, Unacknowledged Classes . . . . . . . . . . . . . . . . . . . . . . 103
Figure C.6 - FCP_XFER_RDY Lost, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . 104
Figure C.7 - FCP_XFER_RDY Received, ACK Lost, Acknowledged Classes . . . . . . . . . . . . 105
Figure C.8 - FCP_RSP Lost, FCP_CONF not requested, Unacknowledged Classes . . . . . . 106
Figure C.9 - FCP_RSP Lost, FCP_CONF not requested, Acknowledged Classes . . . . . . . . 107
Figure C.10 - FCP_RSP Lost Read Command, no FCP_CONF, Acknowledged Classes . . . 108
Figure C.11 - FCP_RSP Received, ACK Lost, Acknowledged Classes, Example 1 . . . . . . . 109
Figure C.12 - FCP_RSP Received, ACK Lost, Acknowledged Classes, Example 2 . . . . . . . 110
Figure C.13 - Lost Write Data, Last Frame of Sequence, Unacknowledged Classes . . . . . . 111
Figure C.14 - Lost Write Data, Last Frame of Sequence, Acknowledged Classes . . . . . . . . . 112
Figure C.15 - Lost Write Data, Not Last Frame of Sequence, Unacknowledged Classes . . . 113
Figure C.16 - Lost Write Data, Not Last Frame of Sequence, Acknowledged Classes . . . . . 114
Figure C.17 - Lost Read Data, Last Frame of Sequence, Unacknowledged Classes . . . . . . 115
Figure C.18 - Lost Read Data, Last Frame of Sequence, Acknowledged Classes . . . . . . . . 116
Figure C.19 - Lost Read Data, Not Last Frame of Sequence, Unacknowledged Classes . . . 117
Figure C.20 - Lost Read Data, Not Last Frame of Sequence, Acknowledged Classes . . . . . 118
Figure C.21 - ACK Lost on Read (Acknowledged Classes) . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Figure C.22 - ACK Lost on Write (Acknowledged Classes) . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Figure C.23 - FCP_CONF Lost, Unacknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Figure C.24 - FCP_CONF Lost, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Figure C.25 - ACK lost on FCP_CONF, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . 123
Figure C.26 - REC or REC Response Lost, Unacknowledged Classes . . . . . . . . . . . . . . . . . 124
Figure C.27 - REC Lost, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Figure C.28 - REC Response Lost, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . 126
Figure C.29 - Two RECs Lost, Unacknowledged Classes, Abort the original Exchange . . . 127
Figure C.30 - SRR Lost, Unacknowledged Classes, Abort original Exchange . . . . . . . . . . . . 128
Figure C.31 - SRR Response Lost, Unacknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . 129
Figure C.32 - SRR Lost, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Figure C.33 - SRR Response Lost, Acknowledged Classes . . . . . . . . . . . . . . . . . . . . . . . . . 131

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INFORMATION TECHNOLOGY –
SMALL COMPUTER SYSTEM INTERFACE (SCSI) –
Part 223: Fibre channel protocol, third version (FCP-3)
FOREWORD
1) ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) form the
specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in
the development of International Standards. Their preparation is entrusted to technical committees; any ISO and
IEC member body interested in the subject dealt with may participate in this preparatory work. International
governmental and non-governmental organizations liaising with ISO and IEC also participate in this preparation.
2) In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.
3) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested IEC and ISO member bodies.
4) IEC, ISO and ISO/IEC publications have the form of recommendations for international use and are accepted by
IEC and ISO member bodies in that sense. While all reasonable efforts are made to ensure that the technical
content of IEC, ISO and ISO/IEC publications is accurate, IEC or ISO cannot be held responsible for the way in
which they are used or for any misinterpretation by any end user.
5) In order to promote international uniformity, IEC and ISO member bodies undertake to apply IEC, ISO and
ISO/IEC publications transparently to the maximum extent possible in their national and regional publications. Any
divergence between any ISO/IECpublication and the corresponding national or regional publication should be
clearly indicated in the latter.
6) ISO and IEC provide no marking procedure to indicate their approval and cannot be rendered responsible for any
equipment declared to be in conformity with an ISO/IEC publication.
7) All users should ensure that they have the latest edition of this publication.
8) No liability shall attach to IEC or ISO or its directors, employees, servants or agents including individual experts
and members of their technical committees and IEC or ISO member bodies for any personal injury, property
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and expenses arising out of the publication of, use of, or reliance upon, this ISO/IEC publication or any other IEC,
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9) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
10) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 14776-223 was prepared by subcommittee 25: Interconnection of informa-
tion technology equipment, of ISO/IEC joint technical committee 1: Information technology.
The list of all currently available parts of the ISO/IEC 14776 series, under the general title Information

FDIS 14776-223 © ISO/IEC:2008(E) – 11 –
14776-223 © ISO/IEC:2008(E) – 11 –
technology – Small computer system interface, can be found on the IEC web site.
This International Standard has been approved by vote of the member bodies and the voting results may be
obtained from the address given on the second title page.

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– 12 – 14776-223 © ISO/IEC:2008(E)
INTRODUCTION
The Small Computer System Interface (SCSI) command set is widely used and applicable to a wide variety of
device types. The transmission of SCSI command set information across Fibre Channel links allows the large
body of SCSI application and driver software to be successfully used in the high performance Fibre Channel
environment.
This standard describes the protocol for transmitting SCSI commands, data and status using Fibre Channel
FC-FS-2 Exchanges and Information Units. Fibre Channel is a high speed serial architecture that allows either
optical or electrical connections. The topologies supported by Fibre Channel include point-to-point, fabric
switched and arbitrated loop. All Fibre Channel connections use the same standard frame format and standard
hierarchy of transmission units to transmit the Information Units that carry SCSI information.
This standard is divided into the following clauses:
Clause 1 is the scope of this standard.
Clause 2 enumerates the normative references that apply to this standard.
Clause 3 describes the definitions, abbreviations and conventions used in this standard.
Clause 4 provides an overview of the protocol for transmitting SCSI information over Fibre Channel.
Clause 5 describes the Information Units used to transfer SCSI commands, data and status across a Fibre
Channel connection.
Clause 6 describes the Basic Link Services and Extended Link Services used by the protocol for transmitting
SCSI information over Fibre Channel.
Clause 7 describes the FC-GS-4 Name Server objects defined for FCP-3.
Clause 8 describes the FCP FC-4 Link Service definitions for the protocol for transmitting SCSI information
over Fibre Channel.
Clause 9 describes the details of the Information Unit formats.
Clause 10 defines the SCSI management features for Fibre Channel, including the SCSI mode pages used
by the protocol for transmitting SCSI information over Fibre Channel.
Clause 11 defines the timers used for FCP-3 error recovery algorithms.
Clause 12 defines the error recovery algorithms for FCP-3.
The Fibre Channel Protocol for SCSI, Third revision (FCP-3) standard has the following annexes:
Annex A is a normative description of the relationship between the services defined by SAM-3 and the
corresponding functions defined by this standard.
Annex B is an informative annex that provides examples of the protocol for transmitting SCSI information
over Fibre Channel.
Annex C is an inform
...