HITACHI 3.5 INCH MAGNETIC DISK DRIVE

Transcription

1 HITACHI 3.5 INCH MAGNETIC DISK DRIVE Reference Manual For Ultrastar 10K300 FC-AL Interface Specification Document Number : K SCSI 2/3 SPECIFICATIONS Hitachi Global Storage Technologies. Page: 1 / 311

2 NOTICE TO USERS While every effort has been made to ensure that the information provided herein is correct please feel free to notify us in the event of an error of inconsistency. Hitachi makes no representations or warranties with respect to the contents hereof and specifically disclaims any implied warranties or merchantability or fitness for any purpose. Further, Hitachi reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation to notify any person of such revisions or changes. (C) 2003, 2004 Hitachi Global Storage Technologies. All rights reserved. Page: 2 / 311

3 REVISION TABLE OEM MANUAL:K Remarks AD : Addition, CH : Change, CR : Correction, DL : Deletion REV Date Signature Page Description Remarks DWN : Shiino All Initial Release CHK : Hida APPD : Takayasu DWN CHK : Shiino : Hida 108 Addition of description about Link bit and Flag bit. AD APPD : Takayasu 168 Change of description about Recovery CH Time Limit. 195 Delete the description about can t DL save Test bit. 303 Change of sense code to 18A2 from CH Change of sense key to 0B from 04. CH DWN : Shiino 17 Addition the description about multi AD CHK : Hida Segmented buffer. APPD : Takayasu 300 Addition of sense key 6 about sense code 0B 01. AD Delete of sense code 0802, 0980, 1000, DL 1200, 1400, 1401, 1491, 1493, 1494, 1498, 14A1, 14B1, 1705, 1707, 1800, 1805, 1900, 1901, 2900, 3F00, 4000, 4200, 4401, 4480, 4481, 44A0, 44A2, 44A5, 44A6, 44C0, 44C1, 44C2, 44D1, 44D2, 44D5, 44D6, 5B00, 8000, DWN : Shiino 122 Change of description about the units CH CHK : Hida of Data Transfer Speed. APPD : Takayasu 190, Addition of RR_TOV Units and Resource Recovery Time-Out Value. AD DWN : Iwata 195 Delete of description about ignoring DL CHK : Masuda EWasc bit. APPD : Takayasu 308 Addition of sense code 44BA. AD REVISION Page: 3 / 311

4 REV Date Signature Page Description Remarks REVISION Page: 4 / 311

5 REV Date Signature Page Description Remarks REVISION Page: 5 / 311

6 REV Date Signature Page Description Remarks REVISION Page: 6 / 311

7 CONTENTS 1 GENERAL DESCRIPTION APPLICATION RELATED DOCUMENT FUNCTION OUTLINE GLOSSARY PRODUCT SPECIFICATION OUTLINE ADDRESSING DISK FORMAT CYLINDER ALLOCATION FORMAT PROCESSING ERROR RETRY READ ERROR RETRY WRITE ERROR RETRY VERIFY ERROR RETRY SEEK ERROR RETRY SPINDLE ERROR RETRY ERROR RETRY CONTROL SUPPORTED SCSI COMMANDS FIBRE CHANNEL INTERFACE TOPOLOGY FRAMES FRAME FORMAT FIBRE CHANNEL ARBITRATED LOOP(FC-AL) ARBITRATED LOOP PHYSICAL ADDRESS(AL_PA) LOOP INITIALIZATION ARBITRATED LOOP ACCESS PUBLIC LOOP ORDERED SETS LINK SERVICE ABORT SEQUENCE(ABTS) BASIC ACCEPT(BA_ACC) BASIC REJECT(BA_RJT) ACCEPT(ACC) LINK SERVICE REJECT(LS_RJT) N_PORT LOGIN(PLOGI) LOGOUT(LOGO) FABRIC LOGIN(FLOGI) READ LINK ERROR BLOCK(RLS) REINSTATE RECOVERY QUALIFIER(RRQ) REQUEST NODE CAPABILITIES INFORMATION(RNC) (Not support) FABRIC ADDRESS NOTIFICATION(FAN) PROCESS LOGIN(PRLI) PROCESS LOGOUT(PRLO) DISCOVER N_PORT SERVICE PARAMETERS(PDISC) DISCOVER ADDRESS(ADISC) Page: 7 / 311

8 THIRD PARTY PROCESS LOGOUT(TPRLO) (Not support) SCSI BUS SCSI BUS FUNCTIONS COMMAND RECEPTION COMMAND QUEUING UNIT ATTENTION CONDITION RESET CONDITION FCP INFORMATION UNIT FCP_CMND FCP_XFER_READY FCP_DATA FCP_RSP FRAME SEQUENSE ENCLOSURE SERVICE INTERFACE(ESI) SPECIFICATION DISCOVERY PROCESS COMMAND PROCESS WRITE PROCESS READ PROCESS SCSI COMMANDS COMMAND STRUCTURE OPERATION CODE LOGICAL UNIT NUMBER RELATIVE ADDRESS LOGICAL BLOCK ADDRESS TRANSFER LENGTH CONTROL BYTE RESERVED VENDOR UNIQUE FORMAT UNIT:(04 H ) INQUIRY:(12 H ) LOG SELECT:(4C H ) LOG SENSE:(4D H ) MODE SELECT:(15 H ) MODE SELECT (10):(55 H ) MODE SENSE:(1A H ) MODE SENSE (10):(5A H ) PERSISTENT RESERVE IN:(5Eh) PERSISTENT RESERVE OUT:(5Fh) READ:(08 H ) READ (EXTENDED):(28 H ) READ BUFFER:(3C H ) READ CAPACITY:(25 H ) READ DEFECT DATA:(37 H ) READ DEFECT DATA(12) :(B7 H ) READ LONG:(3E H ) REASSIGN BLOCKS:(07 H ) RECEIVE DIAGNOSTIC RESULTS:(1C H ) Page: 8 / 311

9 6.20 RELEASE:(17 H ) RELEASE(10):(57 H ) REPORT LUNS:(A0h) REQUEST SENSE:(03 H ) RESERVE:(16 H ) RESERVE(10):(56 H ) REZERO UNIT:(01 H ) SEEK:(0B H ) SEEK (EXTENDED):(2B H ) SEND DIAGNOSTIC:(1D H ) START / STOP UNIT:(1B H ) SYNCHRONIZED CACHE:(35 H ) TEST UNIT READY:(00 H ) VERIFY:(2F H ) WRITE:(0A H ) WRITE (EXTENDED):(2A H ) WRITE AND VERIFY:(2E H ) WRITE BUFFER:(3B H ) WRITE LONG:(3F H ) WRITE SAME:(41 H ) XDREAD:(52 H ) XDWRITE:(50 H ) XPWRITE:(51 H ) SENSE DATA SENSE DATA FORMAT Page: 9 / 311

10 Figures OEM MANUAL:K Figure 2-1 Track Skew (Skew Factor n) Figure 2-2 Cylinder Skew ( Skew Factor n ) Figure 2-3 Sector Reallocation Figure 3-1 Fibre Channel Topology Figure 3-2 Topology of private loop Figure 3-3 Topology of public loop Figure 3-4 Multi Loop Figure 3-5 Redundant Loop Figure 3-6 Frame Format Figure 3-7 Frame Header Format Figure 3-8 Structure of Loop Initialization frame Figure 3-9 Loop initialization flow diagram Figure 3-10 Address Identifier Figure 3-11 NL_Port Initialization Flow Figure 4-1 Discovery Flow Chart Figure 4-2 Phase in SFF-8067 enclosure Figure 4-3 Data transfer for Write Figure 4-4 Data transfer for Read Page: 10 / 311

11 Tables OEM MANUAL:K Table 2-1 Commands Supported Table 2-2 Commands Not Supported Table 3-1 Summary of Fibre Channel Topology Table 3-2 Specification of R_CTL/TYPE field Table 3-3 F_CTL field Table 3-4 AL_PA addressing Table 3-5 AL_PA value priorities Table 3-6 AL_PA mapped to bit maps Table 3-7 Type of LIP Table 3-8 Private Loop Addressing and Public Loop Addressing Table 3-9 Ordered Sets Table 3-10 SOF Delimiters Table 3-11 EOF Delimiters Table 3-12 Primitive Signals Table 3-13 Primitive Sequences Table 3-14 Link Service Frames Table 3-15 BA_ACC payload for ABTS Table 3-16 BA_RJT payload Table 3-17 ACC payload Table 3-18 LS_RJT payload Table 3-19 PLOGI payload Table 3-20 Common Service Parameters(PLOGI payload) Table 3-21 N_Port Name(PLOGI payload) Table 3-22 Node_Name(PLOGI payload) Table 3-23 Class 3 Service Parameters(PLOGI payload) Table 3-24 Vendor Version Level(PLOGI Payload) Table 3-25 ACC payload for PLOGI Table 3-26 LOGO payload Table 3-27 ACC payload for LOGO Table 3-28 FLOGI payload Table 3-29 Common Service Parameters(FLOGI payload) Table 3-30 N_Port Name(FLOGI payload) Table 3-31 Node_Name(FLOGI payload) Table 3-32 Class 3 Service Parameters(FLOGI payload) Table 3-33 Vendor Version Level(FLOGI Payload) Table 3-34 ACC payload for FLOGI Table 3-35 RLS payload Table 3-36 ACC payload for RLS Table 3-37 RRQ payload Table 3-38 ACC payload for RRQ Table 3-39 RNC payload Table 3-40 ACC payload for RNC Table 3-41 FAN Payload Table 3-42 PRLI payload Table 3-43 ACC payload for PRLI Page: 11 / 311

12 Table 3-44 Response Code Table 3-45 PRLO payload Table 3-46 ACC payload for PRLO Table 3-47 Response Code Table 3-48 PDISC payload Table 3-49 ACC payload for PDISC Table 3-50 ADISC payload Table 3-51 ACC payload for ADISC Table 3-52 TPRLO payload Table 3-53 ACC payload for TPRLO Table 4-1 Information Unit Table 4-2 FCP_CMND Payload Table 4-3 FCP_XFER_READY Payload Table 4-4 FCP_DATA Payload Table 4-5 FCP_RSP Payload Table 4-6 Response Information Table 4-7 ESI command format Table 5-1 Standard Command Descriptor Block for 6-byte Commands Table 5-2 Standard Command Descriptor Block for 10-byte Commands Table 5-3 Standard Command Descriptor Block for 12-byte Commands Table 5-4 Operation Code Table 5-5 Control Format Table 6-1 Format Unit Command Variations Table 6-2 Defect List Header Table 6-3 Defect List --- Block Format Table 6-4 Defect List --- from Index Format Table 6-5 Defect List --- Physical Sector Format Table 6-6 Initialization Pattern Descriptor Table 6-7 IP Modifier Table 6-8 Standard Inquiry Data Table 6-9 Data Transfer Speed Table 6-10 Supported Vital Product Data Table 6-11 Unit Serial Number Table 6-12 Implemented Operating Definition Page Table 6-13 Operating Definition Table 6-14 Device Identification Table 6-15 Jumper Information Page Table 6-16 PCR and Parameter List Length Fields Table 6-17 SP and DS Fields Table 6-18 Page Control Field (PC) Table 6-19 Log Page Format Table 6-20 Log Page Codes Table 6-21 Log Parameter Table 6-22 Threshold Met Criteria Table 6-23 Supported Log Pages Table 6-24 Error Counter Read Page (Page Code = 3 H ) Table 6-25 Parameter Codes for Error Counter Pages Page: 12 / 311

13 Table 6-26 Non-Medium Error Page (Page Code = 6 H ) Table 6-27 Non-Medium Error Event Parameter Codes Table 6-28 Last n Error Events Page(Page Code = 7 H ) Table 6.29 Temperature Page(Page Code = D H ) Table 6.30 Start-Stop Cycle Counter Page(Page Code = 0E H ) Table 6.31 Application Client Page(Page Code = 0F H ) Table 6.32 General usage application client parameter data Table 6.33 Self-Test Results Page(Page Code = 10 H ) Table 6.34 Self-Test Results Log Parameter Format Table 6.35 Self-Test Results Values Table 6.36 Informational Exceptions Page (Page Code = 2F H ) Table 6.37 Factory Log Page (Page Code = 3E H ) Table 6-38 Mode Select Parameter List Table 6-39 Read - Write Error Recovery Page (Page Code = 1 H ) Table 6-40 Error Control Bit Combinations Table 6-41 Disconnect - Reconnect Page (Page Code = 2 H ) Table 6-42 Format Device Page (Page Code = 3 H ) Table 6-43 Rigid Disk Geometry Page (Page Code = 4 H ) Table 6-44 Verify Error Recovery Page (Page Code = 7 H ) Table 6-45 Caching Page (Page Code = 8 H ) Table 6-46 Control Mode Page (Page Code = A H ) Table 6.47 QErr Table 6-48 Notch and Partition Page (Page Code = C H ) Table 6-49 XOR Control Page (Page Code = 10 H ) Table 6-50 Enclosure Service Management Page (Page Code = 14 H ) Table 6-51 Fibre Channel Specification Page (Page Code = 19 H ) Table 6-52 RR_TOV Units Table 6-53 Power Condition Control Page (Page Code = 1A H ) Table 6-54 Informational Exceptions Control Page (Page Code = 1C H ) Table 6-55 Method of Reporting Informational Exceptions field Table 6-56 MODE SELECT (10) Header Table 6-57 Mode Sense Data Table 6-58 Sense Data Length Table 6-59 Mode Page 1 H Descriptor Value Table 6-60 Mode Page 2 H Descriptor Value Table 6-61 Mode Page 3 H Descriptor Value Table 6-62 Mode Page 4 H Descriptor Value Table 6-63 Mode Page 7 H Descriptor Value Table 6-64 Mode Page 8 H Descriptor Value Table 6-65 Mode Page A H Descriptor Value Table 6-66 Mode Page C H Descriptor Value Table 6-67 Mode Page 10 H Descriptor Value Table 6-68 Mode Page 10 H Descriptor Value Table 6-69 Mode Page 19 H Descriptor Value Table 6-70 Mode Page 1A H Descriptor Value Table 6-71 Mode Page 1C H Descriptor Value Table 6-72 MODE SENSE (10) Header Page: 13 / 311

14 Table 6-73 PERSISTENT RESERVE IN Service Action Code Table 6-74 READ KEYS Parameter Data Table 6-75 READ RESERVATION Parameter Data Table 6-76 PERSISTENT RESERVE IN reservation descriptor Table 6-77 Persistent reservation scope codes Table 6-78 Persistent Reservation Type Code Table 6-79 PERSISTENT RESERVE OUT Service Action Code Table 6-80 PERSISTENT RESERVATION OUT Parameter List Table 6-81 PERSISTENT RESERVE OUT Service Actions and Valid Parameters.231 Table 6-82 Read Buffer Mode Table 6-83 Read Buffer Header Table 6-84 Read Buffer Descriptor Table 6-85 Echo Buffer Descriptor Table 6-86 Read Capacity Data Table 6-87 Defect List Format Table 6-88 Read Defect Header Table 6-89 Read Defect Header Table 6-90 Reassign Blocks Defect List Table 6-91 REPORT LUNS Parameter List Format Table 6-92 Self-Test Code Field Values Table 6-93 Diagnostic Page Format Table 6-94 Supported Diagnostic Page (Code = 00 H ) Table 6-95 Enclosure Configuration page Table 6-96 Enclosure Control page Table 6-97 Enclosure Status page Table 6-98 Enclosure Help Text page Table 6-99 Enclosure String Out page Table Enclosure String In page Table Enclosure Threshold Out/In page Table Enclosure Array Control page Table Enclosure Array Status page Table Enclosure Element Description page Table Short Enclosure Status page Table Translate Address Page (Code = 40 H ) Table Translation Format Table Read Alternate Page (Code = 40 H ) Table Diagnostic Parameter List Table Sub Command Codes Table Write Buffer Mode Table Write Buffer Header Table 7-1 Extended Sense Data Format Table 7-2 Sense Keys Table 7-3 Additional Sense Codes & Qualifiers Table 7-4 Field Pointer Table 7-5 Actual Retry Count Table 7-6 Progress Indication Page: 14 / 311

15 Preface OEM MANUAL:K This manual describes the specifications of the Small Computer System Interface (SCSI) functions supported by the HITACHI 3 1/2 model magnetic disk drives. 1 GENERAL DESCRIPTION 1.1 APPLICATION This manual applies to the SCSI logical interface specification and Fibre Channel logical interface of the magnetic disk drive. Refer to the individual Product Specifications for the physical specification of the product. 1.2 RELATED DOCUMENT ANSI Specification; (1) Fibre Channel Protocol for SCSI (FCP) X X Revision 012 (2) Fibre Channel Arbitrated Loop (FC-AL) X3T11/Project 960D/Rev 4.5 (3) Fibre Channel Arbitrated Loop (FC-AL-2) X3T11/Project 1133D/Rev 7.0 (4) Fibre Channel Private Loop SCSI Direct Attach (FC-PLDA) X3T11/Project 1162DT/Rev. 2.1 (5) Fibre Channel Fabric Loop Attachment (FC-FLA) T11/Project 1235-DT/Rev. 2.7 (6) Fibre Channel Physical and Signaling Interface (FC-PH) X3T11/Project 755D/Rev.4.3 (7) Fibre Channel Physical and Signaling Interface-2 (FC-PH-2) X3T11/Project 901D/Rev.7.4 (8) Fibre Channel Physical and Signaling Interface-3 (FC-PH-3) X3T11/Project 1119D/Rev.9.4 (9) Small Computer Systems Interface-2 (SCSI-2) X (10) SCSI-3 Primary Commands (SPC) X3T10/Project 955D/Rev 11a (11) SCSI-3 Block Commands (SBC) X3T10/Project 996D/Rev 8c (12) SCSI-3 Primary Commands-2 (SPC-2) X3T10/Project 1236D/Rev 20 (13) SCSI-3 Primary Commands-3 (SPC-3) X3T10/Project 1416D/Rev 5 (14) SCSI-3 Controller Commands (SCC) X3T10/Project 1047D/Rev 6c (15) SFF-8045 Specification for 40-pin SCA-2 Connector w/parallel Section Rev 4.5 (16) SFF-8067 Specification for 40-pin SCA-2 Connector w/bidirectional ESI Rev 2.8 (17) SCSI-3 Enclosure Service Command set (SES) X3T10/Project 1212D/Rev 8b (18) Fibre Channel Physical Interface (FC-PI) NCITS/Project 1235D/Rev 13 Product Specifications; Hard Disk Drive Specifications Ultrastar 10K /147/73/36 (FC-AL Interface) Product Specifications K GENERAL DESCRIPTION Page: 15 / 311

16 1.3 FUNCTION OUTLINE The disk drive is connected to the host computer through the Fibre Channel Interface. The word Controller may be substituted for the disk drive since this manual describes only Fibre Channel interface functions which are implemented by the controller in the disk drive. It s features are listed below. (1) ANSI STANDARD COMPLIANCE The disk drive implements the SCSI-2 and some SCSI-3 specifications and Fibre Channel Interface specifications which conform to the ANSI standard listed in article 1.2. (2) AUTOMATIC ALTERNATE ASSIGNMENT/ACCESS By the FORMAT UNIT or REASSIGN BLOCKS command, alternate sectors are automatically assigned in place of defective sectors. An alternate sector is allocated next to the defective sector on FORMAT UNIT, so, extra rotational latency may be avoided. The access to an alternate sector is done automatically on the read or write operation. (3) AUTOMATIC ERROR CORRECTION The automatic error correction scheme with ECC is capable for an error correction of the medium defect. The On the Fly error correction is also capable for the medium defect and does not require the extra rotational delay. Refer to the Product Specifications for details. (4) AUTOMATIC ERROR RETRY The error recovery function is automatically initiated in case that an error occurred during access to the disk drive. (5) AUTOMATIC POWER-SAVING CONTROL The automatic power-saving function is supported to reduce the power consumption and increase the life time of the magnetic heads and the electronic circuits. This is automatically initiated in an idle condition whenever there are no pending process by the host command. (6) AUTOMATIC READ/WRITE REALLOCATION The automatic read/ write reallocation function is supported. When an error is detected on reading the data(assuming a data field recoverable error) or writing the data(assuming a servo field error), this function automatically assigns an alternate sector in place of the defective sector and stores the data on the alternated sector prior to sending the completion status. 1 GENERAL DESCRIPTION Page: 16 / 311

17 (7) COMMAND QUEUING One command per initiator(host computer) is enqueued(untagged Command Queuing) and/or maximum 128 commands as total number of commands from all host computers are enqueued(tagged Command Queuing). (8) COMMAND RE-ORDERING The disk drive executes the multiple tagged commands with the advanced command re-ordering algorithm. It can optimize the execution time of enqueued commands and provide the high performance for a random or multi-threading access environment. (9) COMPACT DRIVE w/embedded CONTROLLER The disk drive with fully embedded SCSI controller has the 3 1/2 inch industrial standard form factor. (10) DEFERRED ERROR REPORTING The deferred error function reports an error to the subsequent command received from the host computer if an error occurs after the completion with the GOOD status returned. (11) DOWN-LOADABLE FIRMWARE The firmware can be changed by the multi-write BUFFER commands. (12) HIGH-SPEED DATA TRANSFER High-Speed Data Transfer modes are available as follows. Max. 200MB/S Max. 100MB/S (13) MULTI-HOST/MULTI-TARGET CONNECTION Based on the Fibre Channel Arbitrated Loop (FC-AL), maximum 126 devices(including host computers) and one fabric can be connected on the same loop. Therefore, a flexible system configurations can be available. However, the number of connectable host computers is a maximum of 32. (14) MULTI-SEGMENTED BUFFER The large capacity data buffer is equipped and this is maintained as a multisegmented buffer. A multi-segmented buffer scheme provides a high performance for a read/write from the host computer which has the multi-tasking feature. The data buffer can be divided to 2 through 16 (1 increment) segments. Refer to the Product Specifications for the data buffer size. (15) READ AHEAD CACHE The read ahead cache function provides a high performance for a sequential read access. Reading data which the host computer has not yet requested into data buffer is done in advance and directly transferring data to the host computer is done without any latency at sequential access. 1 GENERAL DESCRIPTION Page: 17 / 311

18 (16) SECTOR INTERLEAVE A 1 : 1 interleave is supported. (17) SELECTABLE BLOCK LENGTH A 512 bytes block length is supported as a default and other block length is also available after the disk re-format. Refer to the Product Specification for details. (18) SMART(Self-Monitoring Analysis and Reporting) The SMART(Self-Monitoring Analysis and Reporting) function is supported. This function enables to perform an analysis, logging and reporting the error to the host computer by the disk drive itself. (19) TRACK/CYLINDER SKEW In order to avoid a rotational latency for the seek to the adjacent head or cylinder, Head/ Cylinder Skew function which shifts the sector configuration at the head/ cylinder boundary (between the last sector of the head/ cylinder and the first sector of the next head/ cylinder) is supported, so that the read write head can be positioned to the first sector of the next head/ cylinder. Therefore, reading/ writing of contiguous blocks is done without an extra rotational delay, even if an access is done over the physical track/cylinder boundary. (20) WRITE CACHE The write cache function provides a high performance for a sequential write access. It may return the completion with the GOOD status for a WRITE command after successfully receiving the data from the host computer and prior to having successfully stored the data on the disk medium. (21) DUPLEX FUNCTION During the data transferring, the disk Drive can queue commands received in same port. 1 GENERAL DESCRIPTION Page: 18 / 311

19 1.4 GLOSSARY Bit number A number that represents the weighted position of one byte. Bit n represents a value of 2 n. Command Descriptor Block A command block that is used to communicate requests from (CDB) : an initiator to a target. XX H, XXh Initiator Logical unit A hexadecimal representation of a number (XX with a subscript H/h represents a hexadecimal number). A SCSI device (usually a host computer) that requests another SCSI device to perform an operation. A physical device that is addressable through a target. Logical unit number (LUN) An encoded 6 - bit identifier for a logical unit. Reserved (or R) Target Vendor unique (VU) A term used for a bits, bytes, fields, or code values that are set aside for future standardization. An SCSI device (usually a disk drive w/ SCSI controller) that performs an operation that is requested by an initiator. A bit, byte, field, or code value that can be uniquely specified by each vendor. Fibre Channel Arbitrated Loop One form of the topology in a fiber channel. (FC-AL) An Arbitration is performed, in case it consists of Node/Fabric of a maximum of 127 and a circuit is built on a loop.topology in a fiber channel One form. Arbitrated Loop Physical Address Address information assigned to a meaning for (AL_PA) every port in FC-AL. Each port gains AL_PA through loop initialization processing (the port which has not gained AL_PA shifts to nonparticipating mode). Private Loop FC-AL which is not connected to Fabric (it is Public Loop when connecting with Fabric). 1 GENERAL DESCRIPTION Page: 19 / 311

20 L_Port Circuit Node Fabric Frame Data Frame Sequence Exchange OEM MANUAL:K A port connectable with FC-AL. (In Node, it is NL_Port. In Fabric,it is FL_Port) It is built by two arbitrary ports on FC-AL. Transmission of a frame is possible only among 2 ports which built the circuit. The device which has a Fiber Channel Interface. An entity that interconnects various N_Ports attached to it and is capable of routing frames by using only the D_ID information in a frame header. An indivisible unit of information used by Signaling Protocol. A frame containing information meant for FC-4/ULP(SCSI) or the Link application. A set of one or more Data Frames with a common identifier transmitted unidirectionally from one N_Port to another N_Port. The basic mechanism which transfers information consisting of one or more related non-concurrent Sequences which may flow in the same or opposite directions. 1 GENERAL DESCRIPTION Page: 20 / 311

21 2 PRODUCT SPECIFICATION OUTLINE This chapter describes the logical subjects of Product Specification. Refer to the Product Specification for physical information which are not included herein. 2.1 ADDRESSING The host computer addresses the target logical unit (controller and drive) using the methods described below. (1) AL_PA The device connected to FC-AL acquires address information (AL_PA) through loop initialization processing. AL_PA is uniquely assigned to every which is connected on the same loop device (an initiator or target). (2) Logical unit number The host computer can address a logical unit in one of the following ways : Specifying the logical unit in the logical unit number field of the FCP_CMND Payload. Note : The controller supports only the logical unit number DISK FORMAT CYLINDER ALLOCATION All cylinders on disks are assigned for the system area and the user area. The system area is preserved for the controller s use and may not be accessible from the host computer. The system area is allocated on both outermost cylinders, and it contains the following types of data ; 2 PRODUCT SPECIFICATION OUTLINE Page: 21 / 311

22 Control parameters (MODE SELECT, INQUIRY and LOG) Defect list (manufacture and grown) Control program (Downloadable Firmware) etc. The data in system area is duplicated for data integrity. The user area consists of the diagnostic cylinder, the data area. The user area, except the data area, may not be accessible from the host computer. The diagnostic cylinder is allocated for the diagnostic use when the SEND DIAGNOSTIC command is executed and is called "CE Cylinder". The user data is stored in the data area FORMAT PROCESSING The host computer can format the data area by using FORMAT UNIT and MODE SELECT command. It can also reallocate each defective block by using REASSIGN BLOCKS command. Note : This SCSI controller formats the diagnostic cylinder as well as the data area when a Format Unit command is executed. The outline of the format process is given below. The detail of format processing is shown in the description of ; FORMAT UNIT command ( Refer to 6.1 ), REASSIGN BLOCKS command ( Refer to 6.18 ) MODE SELECT command ( Refer to 6.5 ). (1) Block Length The Block Length indicates the byte length which is the minimum unit of data that can be accessed from the host computer. The default value of block length is 512 bytes. The block length can be changed by specifying the necessary values of MODE SELECT command in fields given below. Block Descriptor 5,6,7 Block Length Format parameter 12, 13 Data s per physical sector The value specified in both of these fields should be the same. If the values differ, the value entered in the Block Descriptor will be used. 2 PRODUCT SPECIFICATION OUTLINE Page: 22 / 311

23 (2) Alternate Spare Area The controller allocates 14 local alternate cylinders per notch as an Alternate Spare Area for the defective sector. (3) Defect Management Defect management is the assignment of alternate spare sectors for defective sectors caused by media flaws. The host computer may access the data block as defect-free media by the defect management. The defect management consists of four schemes based on four defect sources as shown below. P scheme --- Defects identified by manufacturing process. These defects are recorded in the system area as P list. ( Primary Defect list ) C scheme --- Defects detected by medium verification. D scheme --- Defects specified by defect list of FORMAT UNIT command from the host computer. G scheme --- Defects grown after manufactured. These defects are detected by previous C and D scheme, and recorded in the system area as G list. ( Grown Defect list ) The host computer may specify any combination of defect management schemes with CDB ( Command Descriptor Block ) of FORMAT UNIT command and defect list. The controller uses P, C and G schemes as a default mode if the defect management scheme is not specified ( i.e., CDB byte 1, Bit 4, FmtData = 0). (4) Sector Interleave In order to facilitate speed matching between host bus transfer rate and the disk drive transfer rate, the sector interleave function allows formatting " Physical Block ( sector ) " and "Logical Block " with a specified interval. The Interleave value is specified by the CDB of the FORMAT UNIT command, this controller supports sector Interleave factor (n=1) only. (5) Track Skew In order to avoid a rotational latency on the head switching, the controller implements Track Skew which shifts the sector arrangement from each other among tracks in the same cylinder. 2 PRODUCT SPECIFICATION OUTLINE Page: 23 / 311

24 Figure 2-1 explains the details of Track Skew. Sector Sector Number Head 0 Head N-1 N n sectors Figure 2-1 Track Skew (Skew Factor n) (6) Cylinder Skew The controller implements Cylinder Skew which shifts the sector array between cylinders ( i.e., between the last track of a cylinder and the first track of the next cylinder) to avoid a rotational latency when a 1 track seek is performed. Cyl m Last Head N Cyl (m+1) Head n sectors Figure 2-2 Cylinder Skew ( Skew Factor n ) When the skew factor n (the physical sector number between the last logical block of a certain cylinder and the first logical block of the next cylinder) corresponds to the 1 track seeking time, the continuous blocks over two cylinders can be accessed with minimum rotational latency. (7) Format Processing The controller formats all data area and makes logical blocks accessible from the host computer by FORMAT UNIT command in accordance with specified block length, alternate spare area, defect management, sector interleave and skew factor(s). All data in the Data Area is deleted by executing the FORMAT UNIT command. The controller identifies a sector which was specified by defect schemes ( P, D and G schemes ) as defective, and assigns an alternate spare sector for the defective sector. 2 PRODUCT SPECIFICATION OUTLINE Page: 24 / 311

25 The replacement sector is assigned to the next defective sector, to reduce rotational latency. The controller executes a verification after formatting if C scheme is specified. If an error is found, the controller identifies the error sector as defective and reformats the track and the cylinder. The controller adds defects identified by D and C schemes to the current G list and saves the new G list in the system area. (8) Block Reassignment Unrecoverable error blocks caused by growing defects may be reassigned by the REASSIGN BLOCKS command. By REASSIGN BLOCKS command, the controller identifies one or more sectors of the specified logical block as defective, and reassigns them as alternate spare sectors. The error block address ( logical block address ) is informed to the host computer by information bytes of sense data. An example of reallocating an alternate spare sector is shown in Figure 2-3. Error sector Sector number Before N Defective sector (Bad Sector) Alternate Spare Sector (Reserved Sector) After N 1 Reallocated (with sector skipping) Figure 2-3 Sector Reallocation (9) Suggestion for Format Processing It is required to reformat medium by the FORMAT UNIT command if the block length and/or the number of alternate spare area was changed by the MODE SELECT command. A command to access the medium is reported the CHECK CONDITION status with the NOT READY sense key and Medium Format Corrupted sense code if the FORMAT UNIT command is not executed after the change with the related Mode parameter. This sense key is also reported when the Format command is terminated during a format. 2 PRODUCT SPECIFICATION OUTLINE Page: 25 / 311

26 It is suggested to specify P, G and C schemes ( i.e., to use Primary and Grown lists, and to execute verify processing ) when specifying defect management. The D scheme of defect management is not necessary for normal operation. Since the controller automatically reads P and G lists in system area and formats medium, the host computer does not need to specify the defect. The D scheme is convenient for simulating defective sectors for evaluation purpose. It is suggested to set TB(Transfer Block) bit in Error Recovery Parameter of the MODE SELECT command and to issue the READ command for an error block if error data is needed for the data recovery of the block which the REASSIGN BLOCKS command is applied to. The controller transfers the error block data to the host computer. 2.3 ERROR RETRY The controller performs the following retry procedures when an error is detected. The following explanation describes only typical retry method. The controller may use the retry method which is not described in this manual when an actual retry procedure is taken READ ERROR RETRY The controller retries up to 255 times for read error while utilizing Track offset and/or Slice Level function etc. An error count is made per each sector. The host computer can change the error management of the controller with the read-write error recovery parameter (Page Code 1 H ) of the MODE SELECT command WRITE ERROR RETRY The controller retries up to 255 times with the Slice Level etc. The host computer can change the error management of the controller with the read-write error recovery parameter (Page Code 1 H ) of the MODE SELECT command. 2 PRODUCT SPECIFICATION OUTLINE Page: 26 / 311

27 2.3.3 VERIFY ERROR RETRY The controller performs the same retry as the read error retry mentioned in section READ ERROR RETRY for the verify error during the verify operation. The host computer can change the error management of the controller with the verify error recovery parameter (Page Code 7 H ) of the MODE SELECT command SEEK ERROR RETRY The controller performs the same retry as the read error retry or write error retry mentioned in section READ ERROR RETRY and WRITE ERROR RETRY for seek error during the seek action SPINDLE ERROR RETRY The controller retries the spin up operation 4 times when a start spindle error occurs during execution of the Start Unit command or the Auto Start operation. The controller also retries the spin up operation once when an unexpected spin down error occurs during execution of the medium access command ERROR RETRY CONTROL The host computer can change the number of retries of the controller with the error recovery parameter of MODE SELECT command. The error recovery parameter may be specified to the controller by each host computer independently. The summary of error control is explained below. Refer to the description of 6.5 MODE SELECT command. (1) Default Mode The controller specifies the processing given below as Default Mode. Executing the following number of retries until error is recovered. Read Error 144 retries Write Error 128 retries Verify Error 144 retries 2 PRODUCT SPECIFICATION OUTLINE Page: 27 / 311

28 However, if the error in the data field is correctable by ECC the controller corrects the error using ECC, and terminates the recovery procedure (this is applicable when EER=1). (2) Retry Count The host computer can select the retry count by specifying the counts to the retry count field of the error recovery parameter. Notes for Retry Count It is recommended to specify the retry count value at more than 144 times(or 128 times) in normal operation. The controller performs the internal retry before the execution of retries specified by the host computer. If an error is correctable, the controller corrects the error using ECC during the internal retry. When the error is recovered by the internal retry, the controller may not report the recovered error to the host computer even if the PER of MODE Parameter page 01H is set. 2.4 SUPPORTED SCSI COMMANDS This controller supports the group 0,1,2 and 5 commands listed in Table 2-1 based on SCSI-2 command set and additionally some SCSI-3 command set. Table 2-1 Commands Supported Operation Group 0 Command Name Reference Code 00 H TEST UNIT READY H REZERO UNIT H REQUEST SENSE H FORMAT UNIT H REASSIGN BLOCKS H READ A H WRITE B H SEEK H INQUIRY H MODE SELECT H RESERVE H RELEASE A H MODE SENSE 6.7 1B H START/STOP UNIT C H RECEIVE DIAGNOSTIC RESULTS D H SEND DIAGNOSTIC PRODUCT SPECIFICATION OUTLINE Page: 28 / 311

29 Operation Group 1 Command Name Reference Code 25 H READ CAPACITY H READ (EXTENDED) A H WRITE (EXTENDED) B H SEEK (EXTENDED) E H WRITE AND VERIFY F H VERIFY H SYNCHRONIZED CACHE H READ DEFECT DATA B H WRITE BUFFER C H READ BUFFER E H READ LONG F H WRITE LONG 6.38 Operation Group 2 Command Name Reference Code 41 H WRITE SAME C H LOG SELECT 6.3 4D H LOG SENSE H XDWRITE H XPWRITE H XDREAD H MODE SELECT (10) H RESERVE(10) H RELEASE(10) A H MODE SENSE (10) 6.8 5E H PERSISTENT RESERVE IN 6.9 5F H PERSISTENT RESERVE OUT 6.10 Operation Group 5 Command Name Reference Code A0 H REPORT LUNS 6.22 B7 H READ DEFECT DATA(12) 6.16 This controller does not support the group 0, 1 and 2 commands listed in Table 2-2 based on SCSI-2 command set. 2 PRODUCT SPECIFICATION OUTLINE Page: 29 / 311

30 Table 2-2 Commands Not Supported Operation Code Group 0 Command Name 18 H COPY 1E H PREVENT/ALLOW MEDIUM REMOVAL Operation Code Group 1 Command Name 30 H SEARCH DATA HIGH 31 H SEARCH DATA EQUAL 32 H SEARCH DATA LOW 33 H SET LIMITS 34 H PRE-FETCH 36 H LOCK/UNLOCK CACHE 39 H COMPARE 3A H COPY AND VERIFY Operation Code Group 2 Command Name 40 H CHANGE DEFINITION 2 PRODUCT SPECIFICATION OUTLINE Page: 30 / 311

31 3 FIBRE CHANNEL INTERFACE This chapter describes the Fibre Channel(FC) Interface that this controller support as the host interface. 3.1 TOPOLOGY Fibre Channel has three types of its topology as listed below. Point-to-Point Topology Fabric Topology Loop Topology See the Figure 3-1 and the Table 3-1. point to point Loop Node N_Port Node N_Port Public Loop Fabric FL_Port Fabric NL_Port Node NL_Port Node Node N_Port Fabric F_Port Node N_Port NL_Port NL_Port Node NL_Port Node NL_Port Node Private Loop Figure 3-1 Fibre Channel Topology 3 FIBRE CHANNEL INTERFACE Page: 31 / 311

32 Table 3-1 Summary of Fibre Channel Topology Topology Description Loop Private Topology that many number of nodes (up to 126) are connected without Fabric on loop. Public Topology that many number of nodes (up to 126) are connected with Fabric on loop. Point to point Topology between 2 nodes. Fabric Topology between 2 nodes through Fabric. This controller support Private Loop and Public Loop. The Figure 3-2 show Topology of private loop respectively and the Figure 3-3 show Topology of public loop respectively. In case of private loop, topology allows up to 126 node ports on the loop. However, the number of hosts concurrently access this controller shall be less than or equals to 32. Fabric FL_Port Node NL_Port TX RX TX RX RX TX NL_Port Node RX TX NL_Port Node Figure 3-2 Topology of private loop In case of public loop, topology allows up to 126 node ports and one fabric port on the loop. However, the number of hosts concurrently access this controller shall be less than or equals to FIBRE CHANNEL INTERFACE Page: 32 / 311

33 Fabric FL_Port Node NL_Port TX RX TX RX RX TX NL_Port Node RX TX NL_Port Node Figure 3-3 Topology of public loop A controller has two independent ports and connection with the following loops is possible for it. A connection with two independent loops containing a different node(multi Loop) A connection with the loop which consisted of same nodes and doubled only the loop(redundant Loop) The Figure 3-4 and the Figure 3-35 show this controller supports the outline of loop composition. Node Drive Node Drive Node Port A Port B Port A Port B Port A Port B Port A Port B Port A Port B Port A Port B Port A Port B Port A Port B Port A Port B Port A Port B Node Node Node Node Node Figure 3-4 Multi Loop Figure 3-5 Redundant Loop Note : Only one port is simultaneously effective. 3 FIBRE CHANNEL INTERFACE Page: 33 / 311

34 3.2 FRAMES OEM MANUAL:K FRAME FORMAT The Figure 3-6 shows the frame format used with the Fibre Channel. Start of Frame 4s Frame Header 24s Data Field s CRC 4s End of Frame 4s Figure 3-6 Frame Format (1) Start of Frame The Start of Frame(SOF) delimiter is an Ordered Set that immediately precedes the frame context. (2) Frame Header The Frame Header is used by the link control facility to control link operations, control device protocol transfers, and detect missing or out of order frames (3) Data Field Two Frame Types are defined based on the value of bits in the R_CTL field of the Frame Header: - FT_0: Link Control Frame(Data Filed Length=0) - FT_1: Data Frame(Data Filed Length=0-2112) The Data Field in FT_1 frames may contain optional headers. The Contents of the Data Field of a frame, excluding Optional Headers and fill bytes are called Payload. (4) CRC The CRC(Cyclic Redundancy Check) is a four byte field to verify the data integrity of the Frame Header and Data Field. (5) End of Frame The End of Frame(EOF) delimiter is an Ordered Set that immediately follows the CRC. The Figure 3-7 shows the frame header format. 3 FIBRE CHANNEL INTERFACE Page: 34 / 311

35 Bit R_CTL 1 (MSB) 2 D_ID 3 4 CS_CTL (LSB) 5 (MSB) 6 S_ID 7 (LSB) 8 TYPE 9 (MSB) 10 F_CTL SEQ_ID (LSB) 13 DF_CTL 14 (MSB) 15 SEQ_CNT 16 (MSB) 17 OX_ID 18 (MSB) 19 RX_ID (MSB) (LSB) (LSB) (LSB) 22 Parameter 23 (LSB) 3 FIBRE CHANNEL INTERFACE Figure 3-7 Frame Header Format Page: 35 / 311

36 (1) R_CTL (Routing Control) The R_CTL field is used to categorize the frame function. (2) D_ID (Destination ID) The D_ID field contains the address identifier of an N_Port or F_Port within the destination entity. (3) CS_CTL (Class Control) The CS_CTL field contains the control information classified by class. (not used) (4) S_ID (Source ID) The S_ID field contains the address identifier of an N_Port or F_Port within the source entity. (5) TYPE (Data Structure Type) The TYPE field identifies the protocol of the frame content for Data Frames. (6) F_CTL (Frame Control) The F_CTL field contains control information relating to the frame contents. The control information includes the Exchange Context, Sequence Context, etc. (7) SEQ_ID (Sequence ID) The SEQ_ID field contains the SEQ_ID assigned by the Sequence Initiator, and it shall be unique for a specific D_ID and S_ID pair while the Sequence is Open. (8) DF_CTL (Data Field Control) The DF_CTL field specifies the presence of optional headers at the beginning of the Data Field. (9) SEQ_CNT The SEQ_CNT field indicates the sequential order of Data Frame transmission within sequence or multiple consecutive sequences for the same Exchange. (10) OX_ID (Originator Exchange ID) The OX_ID field identifies the Exchange ID assigned by the Originator of the Exchange. Each Exchange shall be assigned an identifier unique to the Originator or Originator- Responder Pair. (11) RX_ID (Responder Exchange ID) The RX_ID field contains the Exchange ID assigned by the Responder of the Exchange. (12) Parameter The Parameter field has two meanings based on frame type. For Link Control frames, this field is used to carry information specific to the individual Link Control frame. For Data frames, this field specifies Relative Offset, a four bytes field that contains the relative displacement of the first byte of the payload of the frame from the base address. 3 FIBRE CHANNEL INTERFACE Page: 36 / 311

37 This controller support only FT_1 (data frame) in the data field, and the kind of data frame is defined by R_CTL of a frame header, and TYPE. The Table 3-2 shows the specification of the R_CTL/TYPE field supported by this controller. Table 3-2 Specification of R_CTL/TYPE field R_CTL TYPE Data Frame Note Routing Information Payload 0000 Solicited Data (0001) FC-4 Device_Data FCP_DATA Unsolicited Control(0010) SCSI-FCP RFC-4 Solicited Control (0011) 08x - Unsolicited Data (0100) FC-AL - Solicited Data (0100) 23x - Data Descriptor (0101) FC Service XFER_RDY Unsolicited Command (0110) 20x FCP_CMND Command Status (0111) FCP_RSP , x Extended Link_Data , 0011 FC-4 Link_Data Video_Data (Same as FC-4 Device Data) 1000 Command Code : NOP, ABTS, RMC, BA_ACC, BA_RJT 00x Basic Link_Data 1100 Command Code : ACK_N, P_RJT, P_BSY, LCR Link_Control frame Class 1, 2 only FC-4 Device_Data FC-4 Video_Data Basic/Extended Link_Data Used for transmission of the original data (FCP InformationUnit etc) Used for transmission of the vender unique data Used for transmission of the Link Service 3 FIBRE CHANNEL INTERFACE Page: 37 / 311

38 The Table 3-3 shows the specification of the F_CTL field supported by this controller. Table 3-3 F_CTL field Bit Contents Support Note 2 7 Exchange Context o FC-PH 0 = Originator of Exchange, 1 = Responder of Exchange 6 Sequence Context o FC-PH 0 = Originator of Sequence, 1 = Responder of Sequence 5 First_Sequence o FC-PH 0 = Sequence other than first of Exchange, 1 = First Sequence of Exchange 4 Last_Sequence o FC-PH 0 = Sequence other than last of Exchange, 1 = Last Sequence of Exchange 3 End_Sequence o FC-PH 0 = Data frame other than last of Sequence, 1 = Last Data frame of Sequence 2 End_Connection (Class 1) or Deactivate Class 4 circuit - FC-PH-2 1 Reserved (FC_PH : Chained Sequence) - FC-PH-3 0 Sequence Initiative o FC-PH 0 = hold Sequence Initiative, 1 = Transfer Sequence Initiative 1 7 X_ID reassigned - FC-PH 6 Invalidate X_ID - FC-PH 5-4 ACK_Form - FC-PH-2 3 Data Compression - FC-PH-2 2 Data Encryption - FC-PH-3 1 Retransmitted Sequence - FC-PH 0 Unidirectional Transmit (Class 1) or Remove Class 4 circuit - FC-PH Continue Sequence Condition - FC-PH 5-4 Abort Sequence Condition - FC-PH 3 Relative Offset present o FC-PH 0 = Parameter field not meaningful, 1 = Parameter field Relative Offset 2 Exchange reassembly (Reserved for Exchange reassembly) FC-PH 1-0 Fill Data s : End of Data field - bytes of fill: 00 = 0 bytes of fill, 01 = 1 byte of fill (last byte of Data field), 10 = 2 bytes of fill (last 2 bytes of Data field), 11 = 3 bytes of fill (last 3 bytes of Data field) o FC-PH 3 FIBRE CHANNEL INTERFACE Page: 38 / 311

39 3.3 FIBRE CHANNEL ARBITRATED LOOP(FC-AL) ARBITRATED LOOP PHYSICAL ADDRESS(AL_PA) Each port on the Arbitrated Loop have an Arbitrated Loop Physical Address(AL_PA), which is determined in the Loop Initialization Process described in The Table 3-4 shows AL_PA addressing and the Table 3-5 shows AL_PA value priorities and the Table 3-6 shows AL_PA mapped to bit maps. Table 3-4 AL_PA addressing Values(hex) Use 00 Reserved for the FL_Port 01-EF Contains 127 valid address F0 Reserved for fairness F1-F6 These values do not have neutral running disparity F7-F8 Reserved for Loop Initialization FB,FD,and FE Reserved for future use FF Reserved to address all ports in broadcast Table 3-5 AL_PA value priorities Values(hex) Priority 00 Highest priority address(assigned to the FL_Port) 01 Highest priority NL_Port address EF Lowest priority NL_Port address F0 Used only by the fairness algorithm and has no priority 3 FIBRE CHANNEL INTERFACE Page: 39 / 311

40 Table 3-6 AL_PA mapped to bit maps AL_PA Bit Map AL_PA Bit Map AL_PA Bit Map AL_PA Bit Map (hex) Word Bit (hex) Word Bit (hex) Word Bit (hex) Word Bit C B B B B B A 2 26 BA F A C 2 25 BC B C C C B E C E F 2 19 CA F CB CC CD B 2 15 CE D 2 14 D A E 2 13 D A C F 2 12 D B A D C A D D A6 2 9 D E A7 2 8 D A9 2 7 DA A 1 6 AA 2 6 DC B 1 5 AB 2 5 E C 1 4 AC 2 4 E D 1 3 AD 2 3 E E 1 2 AE 2 2 E B1 2 1 E A B2 2 0 EF is reserved for the Lbit(Fabric Login required); 3 FIBRE CHANNEL INTERFACE Page: 40 / 311

41 3.3.2 LOOP INITIALIZATION When this controller is turned on and becomes ready and the Arbitrated Loop is detected, this controller perform the Loop Initialization process. The Loop Initialization is performed by ARBx(Arbitrate), LIP(Loop Initialization), CLS(Close) primitives, and the following Loop Initialization frames. LISM: Select Master based on 8-byte Port_Name LIFA: Fabric Assign AL_PA bit map LIPA: Previously Acquired AL_PA bit map LIHA: Hard Assigned AL_PA bit map LISA: Soft Assigned AL_PA bit map LIRP: Report AL_PA position map LILP: Loop AL_PA position map The Table 3-7 shows the type of LIP and the Figure 3-8 shows the structure of Loop Initialization frame. Table 3-7 Type of LIP LIP Reason Code Use Description F7,F7 Initializing LIP It s used by originating L_Port to acquire an AL_PA. F7,AL_PS Initializing LIP It s used by originating L_Port(identified by AL_PS) to reinitialize the Loop. F8,F7 Loop Failure LIP It s used by originating L_Port to indicate that a Loop Failure has been detected at its receiver.(l_port does not have a valid AL_PA.) F8,AL_PS Loop Failure LIP It s used by the originating L_Port (identified by AL_PS) to indicate that Loop Failure has been detected at its receiver. AL_PD,AL_PS Selective Reset LIP It s used by the originating L_Port (identified by AL_PS) to reset the NL_Port(identified by AL_PD). 3 FIBRE CHANNEL INTERFACE Page: 41 / 311