Seagate ST3400071FC manual Reliability and service, Recoverable Errors, Unrecoverable errors

Page 26

5.1.1Recoverable Errors

Recovereable errors are those detected and corrected by the drive, and do not require user intervention.

Recoverable Data errors will use correction, although ECC on-the-fly is not considered for purposes of recov- ered error specifications.

Recovered Data error rate is determined using read bits transferred for recoverable errors occurring during a read, and using write bits transferred for recoverable errors occurring during a write.

5.1.2Unrecoverable errors

Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 1014 bits trans- ferred. Unrecoverable Data Errors resulting from the same cause are treated are 1 error for that block.

5.1.3Seek errors

A seek error is defined as a failure of the drive to position the heads to the addressed track. After detecting an initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning error (Error code = 15h or 02h) will be reported with a Hardware error (04h) in the Sense Key. Recoverable seek errors are specified at Less than 10 errors in 108 seeks. Unrecoverable seek errors (Sense Key = 04h) are classified as drive failures.

5.1.4Interface errors

An interface error is defined as a failure of the receiver on a port to recover the data as transmitted by the device port connected to the receiver. The error may be detected as a running disparity error, illegal code, loss of word sync, or CRC error. The total error rate for a loop of devices is the sum of the individual device error rates.

5.2Reliability and service

You can enhance the reliability of NL35 Series disc drives by ensuring that the drive receives adequate cooling. Section 6.0 provides temperature measurements and other information that may be used to enhance the ser- vice life of the drive. Section 8.2 provides recommended air-flow information.

18	NL35 Series FC Product Manual, Rev. D

Image 26

Contents NL35 Series FC ST3500071FC ST3400071FCPage Contents Interface requirements Defect and error managementInstallation Seagate Technology support services NL35 Series FC Product Manual, Rev. D List of Figures NL35 Series family disc driveViii NL35 Series FC Product Manual, Rev. D Scope NL35 Series family disc driveNL35 Series FC Product Manual, Rev. D Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityElectromagnetic compliance Environmental protectionReference documents Fibre Channel Interface ManualNL35 Series FC Product Manual, Rev. D General description Standard features Reliability Media descriptionPerformance Formatted capacitiesUser-installed accessories Factory-installed accessoriesFactory-installed options Programmable drive capacitySeek performance characteristics Performance characteristicsInternal drive characteristics Access timeGeneralized performance characteristics GHzCache operation Start/stop timePrefetch/multi-segmented cache control Caching write data Prefetch operationPage NL35 Series FC Product Manual, Rev. D Reliability specifications Error ratesUnrecoverable errors Reliability and serviceRecoverable Errors Seek errorsHot plugging the drive Preventive maintenanceMean Time Between Failure Mtbf Performance impact 4 S.M.A.R.TControlling S.M.A.R.T MillisecondsThermal monitor Temperature Log page 0DhPredictive failures Parameter Code DescriptionDST Failure Definition State of the drive prior to testingDrive Self Test DST ImplementationShort test Function Code 001b Invoking DSTShort and extended tests Extended test Function Code 010bShipping Product warrantyAbort Product repair and return informationDC power requirements Physical/electrical specificationsAC power requirements ST3500071FC/ST3400071FC DC power requirementsConducted noise immunity General DC power requirement notesPower sequencing Power dissipation Relative humidity TemperatureEnvironmental limits Effective altitude sea levelShock Package size Packaged/product weight Drop heightShock and vibration Recommended mounting Air cleanliness VibrationAcoustics Typical idle mode sound power ST3500071FC and ST3400071FCCorrosive environment Mechanical specifications Mounting configuration dimensionsNL35 Series FC Product Manual, Rev. D Drive error recovery procedures Defect and error managementDrive internal defects/errors 108.3 Media Pre-Scan FC-AL system errorsBackground Media Scan NL35 Series FC Product Manual, Rev. D Drive orientation InstallationDrive ID/option selection Cooling Air flowDrive mounting GroundingNL35 Series FC Product Manual, Rev. D Link services supported FC-AL featuresFibre Channel link service frames Type of frame Link serviceFibre Channel task management responses Fibre Channel task management functionsFibre Channel Scsi FCP task management functions FC Scsi FCP response codesBytes Fibre Channel port loginNPort login Plogi payload Fibre Channel Process Login Fibre Channel port login acceptNPort Login Accept ACC payload Process Login Plri payloadFibre Channel fabric login Fibre Channel Process Login AcceptProcess Login Accept ACC payload Fabric Login Flogi payloadFibre Channel fabric accept login Fabric Login Accept ACC payloadFC-AL options supported Dual port supportFibre Channel Arbitrated Loop options Option SupportedCommand code Supported Command name Scsi commands supportedSupported commands Supported commands Supported commands Supported commands Supported commands NL35 Series inquiry data Mode Sense dataInquiry data Bytes Data hexPage DEF CHG NL35 Series FC Product Manual, Rev. D Supported Feature or condition Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous statusPhysical description Physical characteristicsFC-AL physical interface Electrical description Connector requirementsPart description Positions Part number Features FC-SCA pin descriptions Pin Signal name Signal typePin descriptions FC-AL transmitters and receivers PowerFault LED Out Active LED Out Enable port bypass signalsNormal command activity LED status Active LED Out conditionsMotor start controls Motor start control signalsParallel Enclosure Services Interface ESI 11 SEL6 through SEL0 ID linesHex Dec SettingArbitrated loop physical address Alpa values Signal characteristics Differential Pecl output characteristics LED driver signalsLED drive signal Differential Pecl input characteristicsEye diagram data values Link rate GHzNL35 Series FC Product Manual, Rev. D Presales Support Seagate Technology support servicesInternet Technical SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index NumericsFAN Flogi Plogi Page See also cooling