Data Buffer Management, Read operation | Fujitsu MBA3300RC specification

Data Buffer Management

INIT

Write→

←Read

Segment

Segment 7

Segment 6

Segment 5

Segment 4

Segment 3

Segment 2

Segment 1

Segment 0

Disk Media

Valid Data

W rite→

←Read

Figure 3.1 Data buffer configuration (in the case of 8 cache segments)

The basic functions and operations of the data buffer in a read operation and a write operation are shown below.

(1) Read operation

Data read from the disk media are temporarily stored in the data buffer.

Then, they are transferred to the interface with the timing specified by the

HDD. The basic read operation procedure is as shown below.

1)When the HDD receives a command, it temporarily closes the connection and locates the data block specified by the command on the medium.

2)When the target data block has been located, the HDD reads the data form the disk media to the data buffer. At this time, if a recoverable error is detected, the HDD performs error recovery processing according to the specification in the MODE SELECT parameter or corrects the data in the data buffer.

3)When the HDD has read out to the data buffer the amount of data that the HDD itself has specified, it performs reconnection processing with the interface and begins transferring data to the INIT from the data buffer while continuing to read subsequent data blocks out to the data buffer.

4)If the data transfer rate of the INIT is high and the data buffer becomes empty before completing the transfer of the number of data blocks specified by the command, the HDD closes the interface at this point. Thereafter, opening, data transfer, and closing operations (the operations in 3) and 4) above) are repeated until all the data blocks specified in the command have been transferred.

128

C141-C013

Image 132

Fujitsu MBA3300RC, MBC2036RC, MBC2073RC, MBA3147RC, MBA3073RC specifications Data Buffer Management, Read operation

Contents

C141-C013-01EN For Safe Operation Handling of This Manual Revision History This page is intentionally left blank Overview of Manual Sense Data and Error Recovery Methods Disk Media ManagementGlossary Acronyms and Abbreviations Conventions Used in this Manual Conventions for Alert Messages Manual Organization Referenced Standards Ansi Contents Contents Command Processing 103 Command Specifications Data Buffer Management127 135 Parameter Data Format 281 Sense Data and Error Recovery Methods 359 Termination status analysis and error recovery methods 374382 384 Glossary 417 Acronyms and Abbreviations 419 Index 421 Figures Tables 100 107 226 311 Total unrecoverable verify errors posted to Init SAS Interface Topologies in SAS Interface SAS Interface SAS Layering Topologies in SAS Interface Physical links and phys Ports narrow ports and wide ports Ports narrow ports and wide ports SAS devices SAS devices Pathways Example of potential pathways Connections Names and identifiers SAS addressesNames and identifiers SAS address format Hashed SAS address Hashed SAS address code parameter Phy layer 1 8b10b codingPhy layer Usage of special characters Link reset sequence Reset-related terminology Start conditions of the link reset sequence Out of band OOB signalsOOB signal timing specifications OOB signal transmitter requirements COMINIT/RESETComsas OOB signal receiver burst time detection requirements COMINIT/COMRESETOOB signal receiver idle time detection requirements OOB signal receiver negation time detection requirements SAS OOB sequency 3 4 n Scenario 2 SAS phy a starts SAS OOB sequence Scenario 3 SAS phy B misses SAS phy As Cominit ∙ When the Cominit signal cannot be detected ∙ When the Comsas signal cannot be detectedSAS speed negotiation sequence Exception handling in the OOB sequence SAS speed negotiation sequence timing specifications 11 SAS speed negotiation window SAS Interface 12 SAS speed negotiation sequence Example Phy reset sequence after devices are attached 14 Phy reset sequence Example When the speed negotiation sequence is successful Phy layer dword synchronization DWSException handling in the speed negotiation sequence Link layer Primitives10 Primitives not specific to type of connection 1/2 Link layer 10 Primitives not specific to type of connection 2/2 11 Primitives used only inside SSP and SMP connections Primitive sequences Primitives not specific to type of connections12 Primitive sequences AIP Arbitration in progress Break Broadcast Error HardresetClose Eoaf End of address frame Notify OpenacceptOpenreject 13 Openreject abandon primitives Supported 14 Openreject retry primitives No Destination Soaf Start of address frame Primitives used only inside SSP and SMP connections ACK acknowledgeDone 15 Done primitives EOF End of frame NAK negative acknowledgementRrdy SOF Start of frame Clock skew management Idle physical link16 Clock skew management Align insertion requirement Scrambling 17 Scrambling for different data dword types Address frames Address frames overviewAddress frames 18 Address frame format Identify address frame 19 Identify address frame format20 Device Type field Device Type SAS AddressPHY Identifier Open address frame 21 Open address frame format22 Protocol field SMP 23 Connection Rate field 24 Arbitration Wait Time field ∙ Connection Rate∙ Initiator Connection TAG Identification and hard reset sequence ∙ Destination SAS Address∙ Pathway Blocked Count ∙ Arbitration Wait Time Connections overview Connection request Connection responses 25 Connection responsesArbitration fairness Bits 79-64 79 is MSB Bits 63-0 0 is LSB Aborting a connection request 27 Abort connection responses Closing a connection 28 Close connection responsesClose Breaking a connection 29 Break connection responsesRate matching SSP link layer 30 Rate matching Align and/or Notify insertion requirements SSP frame transmission and reception SSP flow controlCreditblocked Interlocked frames 31 SSP frame interlock requirements 17 Interlocked frames 18 Non-interlocked frames with the same tag 20 Closing an SSP connection example Transport layer SSP frame format32 SSP frame format Transport layer 33 Frame Type fieldNodata Responsedata SAS Interface Command information unit 34 Command information unitInformation units 35 Task Attribute field SimpleHead of Queue Ordered Transport layer Task information unit 36 Task information unit 37 Task Management Function field Abort Task SET Response Data Xferrdy information unit38 Xferrdy information unit 39 An example of requested offset Requested Offset Write Data Length 21 Example of Xferrdy frames Data information unit 40 Data information unit SAS Interface TOO Much Write Data Response information unit 41 Response information unit42 Datapres field ∙ Response information unit Nodata format ∙ Response information unit Responsedata format 43 Response Data field 44 Response Code field∙ Response information unit Sensedata format Transport layer Sequences of SSP frames 22 Example of Task frame 23 Example of write command Exceptional event processing of a drive Transport layer 45 Exceptional event processing of a drive 1/2 Clear Task SET Management Function Complete 45 Exceptional event processing of a drive 2/2 102 C141-C013 Command Processing Command Format Command Processing 6-Byte CDB basic format10-Byte CDB basic format Bit Byte Operation Code Control ByteOperation code Operation code Logical block address Transfer data length Command Format Control byteControl byte Handling an illegal CDB Status Byte StatusGood status Check Condition status Command Terminated status Condition MET StatusBusy status Intermediate status Command Queuing Function READ, Read EXTENDED, WRITE, Write Extended When a Power On or Reset occurs When I-T Nexus Loss occursUnit Attention Condition Generation of the Unit Attention condition Commands cleared by another Init Logical Unit Reset Inquiry command Request Sense commandReport Luns command Sense Data Hold State Power Condition ∙ ActiveWait state ∙ Commands that can be executed even in the Not Ready state ∙ Operation when formatting is not completed normallyLED Display LED Display Command Processing Exceptions Overlapped tagLED display Illegal LUN specification Command Processing Exceptions Error recovery processing Recovery procedures for disk drive errorsOutline of disk drive error recovery processing Reserved operation code Abort processing Comparison between SAS and Scsi about definition∙ Nexus Hard Reset ∙ Abort processing during write operation 10 Reset processing during write Fatal hardware errors Self-diagnostic errorsUnrecoverable hardware errors Data Block Addressing Data Block Addressing Data space configuration Logical block addressing User space logical block addresses Alternate area Data buffer configuration and basic operation Data Buffer Data Buffer Management Read operation Data Buffer Write operation Look-Ahead Cache Feature Caching object commandsCaching operation Read Read Extended Look-Ahead Cache Feature Disabling caching data− Write − Write Extended − Write and Verify Data Buffer Management Look-Ahead operation, Look-Ahead volume Caching parameters This page is intentionally left blank Control/Sense Commands Test Unit Ready Command Specifications Inquiry Control/Sense Commands Standard Inquiry data Fujitsu Version field Command Specifications Command queuing Version descriptor ByteSAM2 OX0B, Oxfc SAS Command support data Support VPD information VPD information VPD identifier list VPD information device serial No 10 VPD information device unique information 1/2 PIVMSB 10 VPD information device unique information 2/2 MBS Code SET Command Specifications Read Capacity 11 Read Capacity data Mode Select Command Specifications Mode Select parameter structure Command Specifications 12 Mode Select command Group 0 parameter configuration 1/2 12 Mode Select command Group 0 parameter configuration 2/2 SPF Control/Sense Commands Command Specifications 13 Mode Select parameters Command Specifications Mode Select Extended Byte Sub Page Descriptor Bit Byte Mode Sense 1A 15 Mode 16 Mode Sense data type specifications Control/Sense Commands 17 Mode Sense command group 0 parameter configuration 1/2 17 Mode Sense command group 0 parameter configuration 2/2 Header Block descriptor Descriptor Control/Sense Commands Mode Sense Extended 5A Header Bit Byte 176 C141-C013 Rezero Unit START/STOP Unit 1B Control/Sense Commands Reserve Logical unit reserve function Reserve right and third party reserve function Reserve Extended Release Release functionRelease object and third party release function Release Extended Request Sense Command Specifications LOG Select 4C 20 LOG Select command parameter configuration 19 PC page control Code 21 Page codeLength 22 Log parameter TSD ETC TMCParameter code Byte Lbin LOG Sense 4D 23 Page Code assignment for the log pages Log parameters Persistent Reserve in 5E Persistent Reserve in service actions 24 Persistent Reserve in service actionsRead Keys Read Reservation Persistent Reserve in parameter data for Read Keys 25 Persistent Reserve in parameter data for Read KeysLSB MSB Persistent Reserve in parameter data for Read Reservations Format of the Reservation descriptors is defined in Table ∙ Persistent reservations scope 28 Persistent reservations scope∙ Persistent reservations type 29 Persistent reservations type codes Persistent Reserve OUT 5F Command Specifications Persistent Reserve OUT service actions 30 Persistent Reserve OUT service action codes Persistent Reserve OUT parameter list 31 Persistent Reserve OUT parameter listAptpl Control/Sense Commands Command Specifications Report Luns A0 Persistent Reserve 33 Report Luns parameter data Report Device Identifier A3 34 Report Device Identifier parameter data SET Device Identifier A4 35 SET Device Identifier parameter data Data Access Commands Data Access CommandsRead Command Specifications Read Extended FUA Write 0A Data Access Commands Write Extended 2A Write and Verify 2E Verify 2F Seek 0B Seek Extended 2B Synchronize Cache Format Commands Format Unit Format Commands Defect list Specifying the initialization method 36 Defect list format 37 Format Unit command parameter list configuration Format parametersFOV Stpf Command Specifications Format Commands 38 Defect descriptor byte distance from index format 39 Defect descriptor physical sector address format Command Specifications 40 Format Unit command defect processing 1/2 Defect processing during initialization 40 Format Unit command defect processing 2/2 Reassign Blocks Bit Byte X07 41 Reassign Block command defect data list configuration = Hardware Error Correction of the defect descriptor Bit Byte X37 PList GList Transfer Byte Length MSB Transfer Byte Length LSB42 Defect data type 44 Read Defect Data command defect data configuration 43 Defect data format Defect descriptor list 45 Defect data conditions Format Commands Read Defect Data B7 46 Read Defect Data command B7 defect data configuration Maintenance, Diagnostic Commands Self-diagnosis test 47 Self-diagnosis test Parameter specification PER DTE Maintenance, Diagnostic Commands 49 Send Diagnostic command parameter list configuration 50 Page codePHY Test 51 Send Diagnostic parameters page code list 52 Send Diagnostic parameters PHY Test function Maintenance, Diagnostic Commands Command Specifications 54 Specifying address format Logical unit Self-Test 55 SELF-TEST Receive Diagnostic Results 1C Parameters Code list 57 Receive Diagnostic Results response data page code list Logical/physical address conversion 59 Address format Write Buffer 3B 60 Write Buffer transfer mode 61 Write Buffer command buffer data mode = 000 Mode = 0, 0, 0, 1 Header + data, with address specification Mode = 0, 0, 1, 0 Data only, with address specification Mode = 0, 1, 0, 0 Microcode download, without savingMode = 0, 1, 0, 1 Microcode download, with saving Maintenance, Diagnostic Commands Command Specifications Mode = 1, 0, 1, 0 Echo buffer 62 Read Buffer transfer mode Read Buffer 3C 63 Read Buffer command buffer data mode = 0000 Mode = 0, 0, 0, 1 Header + data, with address specification Mode = 0, 0, 1, 1 Buffer descriptor 64 Read Buffer command buffer descriptor Mode = 1, 0, 1, 1 Echo buffer descriptor 65 Read Buffer command echo buffer descriptorEbos Read Long 3E 05 = Illegal Request Write Long 3F Command Specifications Write Same Command Specifications Mode Parameters Parameter Data Format Read/Write Error Recovery Parameters Page Code = Mode Select parameters read/write error recovery parametersParameter Data Format Mode Parameters Read Read Extended Read LongWrite Extended Write Long Write Same Parameter Data Format Mode Parameters Combinations of error recovery flags EER PER DTE DCR Mode Select parameters disconnect/reconnect parameters Disconnect/Reconnect Parameters Page Code = Parameter Data Format Mode Select parameters format parameters Format Parameters Page Code = Parameter Data Format Mode Parameters Parameter Data Format C141-C013 293 Mode Select parameters drive parameters Drive Parameters Page Code = Mode Parameters Verify Error Recovery Parameters Page Code = Mode Select parameters verify error recovery parametersVerify Mode Parameters Mode Select parameters caching parameters Caching Parameters Page Code = Mode Parameters Parameter Data Format Mode Parameters Parameter Data Format Mode Parameters Control Mode Parameters Page Code = 0A Mode Select parameters control mode parameters Mode Parameters TAS task aborted status not supported Mode Parameters 10 Mode Select parameters notch parameters Notch Parameters Page Code = 0C Mode Parameters Port Control Parameter Page Code = 11 Port control parameter Page 0 Format Short Page Format Code Description 12 Port control parameter Sub Page Format Long FormatNumber of Phys 13 SAS phy mode descriptor format This page cannot be modified Parameter Data Format C141-C013 315 Power Condition Parameter Page Code = 1A 14 Power condition parameter Page 0 Format Short Page Format 15 Mode Select parameters informational exception control Informational Exceptions Control Page Page Code = 1C Parameter Data Format Mode Parameters 16 Mrie 1/2 17 Interval timer 16 Mrie 2/2 Background Control Mode Parameter Page Code = 1C/subpage = 18 Mode Select parameters background control mode parameterFfff Pre-Scan is disabled Parameter Data Format Additional Error Recovery Parameters Page Code = Fujitsu unique parameter 20 Mode parameter default values 9A 0A 00 00 FF FF FF FF FF FF FF FF Log Parameters Log Parameters21 Log parameter format Parameter Data Format Support Log 22 Support log Buffer Overrun/Underrun 23 Buffer overrun/underrunETC TMC Write Error Count 24 Write error count Write errors recovered without delays page 02, code 25 Write errors recovered without delays page 02, codeWrite errors recovered with possible delays page 02, code Total write errors posted page 02, code 27 Total write errors posted page 02, codeTotal recoverable write errors posted to Init page 02, code TSD ETC Total write bytes processed page 02, code 29 Total write bytes processed page 02, code Read Error Count 31 Read error countRead errors recovered without delays page 03, code 32 Read errors recovered without delays page 03, code Read errors recovered with possible delays page 03, code 33 Read errors recovered with possible delays page 03, codeTotal read errors posted page 03, code 34 Total read errors posted page 03, code Total recoverable read errors posted to Init page 03, code Total read bytes processed page 03, code36 Total read bytes processed page 03, code Verify Error Count 38 Verify error count Verify errors recovered without delays page 05, code 39 Verify errors recovered without delays page 05, codeVerify errors recovered with possible delays page 05, code TSD ETC TMC Lbin Total verify errors posted page 05, code 41 Total verify errors posted page 05, code Total verify bytes processed page 05, code 43 Total verify bytes processed page 05, code Non-Medium Error Count Temperature Page X0D45 Non-medium error count 46 Temperature page X0D Temperature page 0D, code 47 Temperature page 0D, codeReference temperature page 0D, code 48 Reference temperature page 0D, code Start-Stop Cycle Counter Page X0E 49 Start-stop cycle counter page X0EDate of manufacture page 0E, code 50 Date of manufacture page 0E, code Accounting date page 0E, code 51 Accounting date page 0E, codeSpecified cycle count over device lifetime page 0E, code 52 Specified cycle count over device lifetime page 0E, code Start-stop cycle counter page 0E, code 53 Start-stop cycle counter page 0E, code Application Client Page X0F 54 Application client page X0F Self-Test Result 56 Self-test resultSelf-test result parameter data page 10, code 57 Self-test result parameter data page 10, code 58 Self-test results values Background Medium Scan 59 Background medium scan60 Background medium scan status parameter 61 BMS status 62 Background medium scan parameter MSB LBA LSB63 Reassign status Protocol Specific Port Log 64 Protocol specific port log page format Details of the log parameter 65 Log parameter formatETC TMC Lbin Init Log Parameters Parameter Data Format Smart Status Page X2F Smart Data66 Smart status page X2F 67 Smart data This page is intentionally left blank Sense Data Sense data format Sense Data and Error Recovery Methods Sense data formatILI Sksv Sense data basic information Command inherent information Additional sense data lengthAdditional Sense code, Additional Sense code Qualifier Sense key inherent information Sksv MSB Recovered Error Sense key Enable Spinup Sense Data and Error Recovery Methods Init Sense Data and Error Recovery Methods Sense Data Sense Data and Error Recovery Methods Sense data additional information PortCDB operation code Detailed information Init Error Recovery Methods Recommended Termination status analysis and error recovery methods Init Error Recovery Methods Recommended Command completion wait time-out Sense data analysis and error recovery methods Sense data error classification 1/3 Sense data error classification 2/3 Sense data error classification 3/3 Error recovery processing procedures 1/4 Error recovery processing procedures 2/4 Spinup Error recovery processing procedures 3/4 Error recovery processing procedures 4/4 Disk Drive Error Recovery Processing Error loggingError states and retry processing procedures Seek error Disk Drive Error Recovery Processing Write errorRead error in uncorrectable data Correctable data read error Other internal HDD errors Auto alternate block allocation processing Disk Drive Error Recovery Processing Error recovery processing control Disk drive errors and number of retries Sense Data and Error Recovery Methods Defect Management Defect lists Disk Media Management Alternate block allocation Defect Management Initialization during installation Issuing the Mode Select commandDisk Media Initialization Issuing the Format Unit command Mode Select commandRe-initialization Disk Media Initialization Format Unit command Alternate Block Allocation Processing Alternate Block Allocation Processing Background Media Scan BMS mode Pre-Scan modeBackground Media Scan BMS Overview Write command operation during a Pre-Scan Background Media Scan BMS∙ PER Conditions for operation Mode Page 0x1C SubPage 0x01 Background Control Mode Mode Background Media Scan BMS Background Media Scan Log Background Media Scan Log Page format BMS Status parameter format Medium Scan parameter format Background Media Scan BMS Drive Self-Test DST Foreground mode Self-test modesDrive Self-Test DST Background mode Matters that are common to both modes Short self-testExtended self-test Test segments Disk Media Management Drive Self-Test DST Smart Self-Monitoring Analysis and Reporting Technology Data analysis Smart Self-Monitoring Analysis and Reporting Technology Failure prediction method Smart ASC/ASCQASC Ascq Smart Self-Monitoring Analysis and Reporting Technology Disk Media Management Smart thresholds Reporting function Command Common Command Set CCSAdditional Sense Code Initiator Init This page is intentionally left blank ACK AENALT Arre Acronyms and Abbreviations Index Command Terminated Index Details of parameters on Mode Intermediate Condition Mode Sense Extended Persistent Reserve OUT Receive Diagnostic Report Device IdentifierReservation Conflict SET Device Identifier TB284 READER’S Comment Form This page is intentionally left blank C141-C013-01EN Page