Seagate ST336807FC manual Defect and error management, Drive internal defects/errors

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7.0Defect and error management

The drive, as delivered, complies with this product manual. The read error rates and specified storage capaci- ties are not dependent upon use of defect management routines by the host (initiator).

Defect and error management in the SCSI protocol involves the drive internal defect/error management and FC-AL system error considerations (errors in communications between the initiator and the drive). Tools for use in designing a defect/error management plan are briefly outlined in this section. References to other sec- tions are provided when necessary.

7.1Drive internal defects/errors

During the initial drive format operation at the factory, media defects are identified, tagged as being unusable, and their locations recorded on the drive primary defects list (referred to as the “P’ list and also as the ETF defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the Read Defect Data command.

Details of the SCSI commands supported by the drive are described in the Fibre Channel Interface Manual. Also, more information on the drive Error Recovery philosophy is presented in the Fibre Channel Interface Manual.

7.2Drive error recovery procedures

When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery proce- dures to attempt to recover the data. The error recovery procedures used depend on the options previously set in the Error Recovery Parameters mode page. Error recovery and defect management may involve using sev- eral SCSI commands described in the Fibre Channel Interface Manual. The drive implements selectable error recovery time limits required in video applications.

The error recovery scheme supported by the drive provides a way to control the total error recovery time for the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent in error recovery for a command can be limited using the Recovery Time Limit bytes in the Error Recovery mode page. The total amount of time spent in error recovery for a single LBA can be limited using the Read Retry Count or Write Retry Count bytes in the Error Recovery mode page.

The drive firmware error recovery algorithms consists of 12 levels for read recoveries and five levels for write. Each level may consist of multiple steps, where a step is defined as a recovery function involving a single re- read or re-write attempt. The maximum level used by the drive in LBA recovery is determined by the read and write retry counts.

Cheetah 10K.7 36GB FC Product Manual, Rev. A

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Contents Cheetah 10K.7 FC Page Cheetah 10K.7 FC Page Revision Date Sheets Affected Revision status summary sheetRev. a 05/04/05 All. Initial release Page Contents Interface requirements Physical/electrical specificationsDefect and error management InstallationSeagate Technology support services Viii Cheetah 10K.7 36GB FC Product Manual, Rev. a Cheetah 10K.7 FC family disc drive List of FiguresCheetah 10K.7 36GB FC Product Manual, Rev. a Cheetah 10K.7 FC family disc drive ScopeCheetah 10K.7 36GB FC Product Manual, Rev. a Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityEuropean Union Restriction of Hazardous Substances RoHS Electromagnetic complianceFibre Channel Interface Manual Reference documentsCheetah 10K.7 36GB FC Product Manual, Rev. a General description Media description Standard featuresProgrammable drive capacity PerformanceReliability Formatted capacitiesUser-installed accessories Factory-installed accessoriesFactory-installed options ST336807FC Performance characteristicsInternal drive characteristics Generalized performance characteristics Seek performance characteristicsAccess time Format command execution time in minutesCache operation Start/stop timePrefetch/multi-segmented cache control Caching write data Prefetch operation Cheetah 10K.7 36GB FC Product Manual, Rev. a Recoverable Errors Reliability specificationsError rates Reliability and service Controlling S.M.A.R.T Hot plugging the drive4 S.M.A.R.T Determining rate Performance impactMilliseconds Reporting controlDrive Self Test DST Temperature Log page 0DhParameter Code Description Invoking DST State of the drive prior to testingDST Failure Definition ImplementationLog page entries Product warrantyShort test Function Code 001b Extended test Function Code 010bProduct repair and return information ShippingST336807FC DC power requirements Physical/electrical specificationsAC power requirements DC power requirementsConducted noise immunity General DC power requirement notesPower sequencing Typical ST336807FC drive, 2 Gbit, +5V current profile Typical ST336807FC drive, 2 Gbit, +12V current profileST336807FC Power dissipationEffective altitude sea level TemperatureEnvironmental limits Relative humidityShock Package size Packaged/product weight Drop heightShock and vibration Recommended mounting Corrosive environment Air cleanlinessVibration Acoustics Mechanical specificationsMounting configuration dimensions Drive error recovery procedures Defect and error managementDrive internal defects/errors 77.7 Media Pre-Scan FC-AL system errorsBackground Media Scan Cheetah 10K.7 36GB FC Product Manual, Rev. a Drive ID/option selection InstallationPhysical interface Drive Front LED connectionsCooling 1 J6 connector requirementsDrive orientation Grounding Drive mountingType of frame Link service FC-AL featuresFibre Channel link service frames Link services supportedFC Scsi FCP response codes Fibre Channel task management functionsFibre Channel Scsi FCP task management functions Fibre Channel task management responsesBytes Fibre Channel port loginNPort login Plogi payload Process Login Plri payload Fibre Channel port login acceptNPort Login Accept ACC payload Fibre Channel Process LoginFabric Login Flogi payload Fibre Channel Process Login AcceptProcess Login Accept ACC payload Fibre Channel fabric loginFabric Login Accept ACC payload Fibre Channel fabric accept loginOption Supported Dual port supportFibre Channel Arbitrated Loop options FC-AL options supportedCommand code Supported Command name Scsi commands supportedSupported commands Supported commands Supported commands Supported commands Supported commands Bytes Data hex Mode Sense dataInquiry data Cheetah 10K.7 FC inquiry dataPage DEF CHG Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or conditionPhysical description Physical characteristicsFC-AL physical interface Part description Positions Part number Features Connector requirementsElectrical description J6 connector dimensionsFC-SCA pin descriptions Pin Signal name Signal typePin descriptions FC-AL transmitters and receivers PowerFault LED Out Active LED Out conditions Enable port bypass signalsNormal command activity LED status Active LED Out11 SEL6 through SEL0 ID lines Motor start control signalsParallel Enclosure Services Interface ESI Motor start controlsHex Dec SettingArbitrated loop physical address Alpa values Signal characteristics Differential Pecl input characteristics LED driver signalsLED drive signal Differential Pecl output characteristicsLink rate GHz Eye diagram data valuesCheetah 10K.7 36GB FC Product Manual, Rev. a Technical Support Seagate Technology support servicesInternet MySeagate Reseller.seagate.com Presales SupportData Recovery Services Warranty ServiceData Recovery Services Authorized Service Centers Toll-free support numbers FAX services-All Europe toll callCall center Presales and Technical Support Warranty Service Asia/Pacific support services Publication feedback survey Cheetah 10K.7 36GB FC Product Manual, Rev. a Numerics IndexFAN Flogi PBC Page See also cooling
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