Seagate ST3450802FC, ST3300602FC manual Reliability and service, Seek errors, Interface errors

Page 22

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 disk 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 service life of the drive. Section 8.2 provides recommended air-flow information.

5.2.1Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)

These drives shall achieve an AFR of 0.55% (MTBF of 1,600,000 hours) when operated in an environment that ensures the HDA case temperatures do not exceed the values specified in Section 6.4.1.

Operation at case temperatures outside the specifications in Section 6.4.1 may increase the AFR (decrease the MTBF).

AFR and MTBF statistics are poplulation statistics that are not relevant to individual units. AFR and MTBF specifications are based on the following assumptions for Enterprise Storage System environments:

•8,760 power-on hours per year

•250 average on/off cycles per year

•Operating at nominal voltages

•System provides adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not exceeded.

5.2.2Preventive maintenance

No routine scheduled preventive maintenance is required.

5.2.3Hot plugging the drive

Inserting and removing the drive on the FC-AL will interrupt loop operation. The interruption occurs when the receiver of the next device in the loop must synchronize to a different input signal. FC error detection mecha- nisms, character sync, running disparity, word sync, and CRC are able to detect any error. Recovery is initiated based on the type of error.

The disk drive defaults to the FC-AL Monitoring state, Pass-through state, when it is powered-on by switching the power or hot plugged. The control line to an optional port bypass circuit (external to the drive), defaults to the Enable Bypass state. If the bypass circuit is present, the next device in the loop will continue to receive the output of the previous device to the newly inserted device. If the bypass circuit is not present, loop operation is temporarily disrupted until the next device starts receiving the output from the newly inserted device and regains synchronization to the new input.

16

Cheetah NS 10K.2 FC Product Manual, Rev. B

Page 21 Page 23
Image 22
Page 21 Page 23
Contents Cheetah NS 10K.2 FC ST3600002FC ST3450802FC ST3300602FCPage Contents Installation Seagate Technology support services Cheetah NS 10K.2 FC Product Manual, Rev. B Scope Cheetah NS 10K.2 FC Product Manual, Rev. B Electromagnetic compatibility Standards, compliance and reference documentsStandards Electromagnetic susceptibilityCompliance Reference documents Ncits TR-19Cheetah NS 10K.2 FC Product Manual, Rev. B General description Standard features Media descriptionReliability PerformanceFormatted capacities User-installed accessories Factory-installed optionsProgrammable drive capacity Access time Performance characteristicsInternal drive characteristics Seek performanceStart/stop time Format command execution time minutesGeneral performance characteristics ST3600002FC ST3450802FC ST3300602FCPrefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationRecoverable Errors Reliability specificationsError rates Unrecoverable ErrorsInterface errors Reliability and serviceSeek errors Preventive maintenanceControlling S.M.A.R.T A.R.T. delay times4 S.M.A.R.T Performance impactPredictive failures Reporting controlDetermining rate Thermal monitorDrive Self Test DST State of the drive prior to testingTemperature Log Page 0Dh DST failure definitionShort test Function Code 001b Invoking DSTShort and extended tests Extended test Function Code 010bProduct warranty AbortCheetah NS 10K.2 FC Product Manual, Rev. B DC power requirements Physical/electrical specificationsAC power requirements DC power requirements for ST3600002FC model Gbit AmpsDC power requirements for ST3450802FC model Gbit Amps General DC power requirement notes DC power requirements for ST3300602FC model Gbit AmpsConducted noise immunity Power sequencingCurrent profiles Cheetah NS 10K.2 FC Product Manual, Rev. B Cheetah NS 10K.2 FC Product Manual, Rev. B Power dissipation ST3600002FCST3450802FC ST3300602FC Environmental limits Temperature a. OperatingRelative humidity Shock and vibration Effective altitude sea level a. OperatingShock Package size Packaged/product weight Drop height Recommended mountingAcoustics Air cleanlinessVibration a. Operating-normal Corrosive environmentChina Restriction of Hazardous Substances RoHS Directive Mechanical specifications Mounting configuration dimensionsCheetah NS 10K.2 FC Product Manual, Rev. B Drive internal defects/errors Defect and error managementDrive error recovery procedures 77.81 Background Media Scan FC-AL system errorsMedia Pre-Scan Deferred Auto-Reallocation Idle Read After WriteDrive orientation InstallationDrive ID/option selection CoolingDrive mounting Air flowGrounding Cheetah NS 10K.2 FC Product Manual, Rev. B Link services supported Type of frame FC-AL featuresFibre Channel link service frames Interface requirementsFibre Channel task management responses Fibre Channel task management functionsFC Scsi FCP response codes Function name Response code Fibre Channel port login NPort login Plogi payload BytesNPort Login Accept ACC payload Bytes Fibre Channel port login acceptFibre Channel Process Login Process Login Plri payloadProcess Login Accept ACC payload Bytes Fibre Channel Process Login AcceptFibre Channel fabric login Fabric Login Flogi payload BytesFibre Channel fabric accept login Fabric Login Accept ACC payload BytesFC-AL options supported Dual port supportFibre Channel Arbitrated Loop options Option SupportedScsi commands supported Supported commands Command code Command nameVerify error recovery page 07h Cheetah NS 10K.2 FC Product Manual, Rev. B Temperature page 0Dh Inquiry data Mode Sense dataCheetah NS 10K.2 FC inquiry data Bytes Data hex Page Mode Data Header Mode Pages 00 00 05 12 8B 00 50 Miscellaneous operating features and conditions Supported Feature or conditionFC-AL physical interface Physical characteristicsPhysical description Electrical description Connector requirementsPin descriptions FC-SCA pin descriptions Pin Signal name Signal type FC-AL transmitters and receiversPower Fault LED OutActive LED Out Enable port bypass signalsMotor start controls Parallel Enclosure Services Interface ESI 11 SEL6 through SEL0 ID linesAlpa SEL ID TTL input characteristics Signal characteristicsDevice control codes FC Differential output LED driver signalsFC Differential input Receive eye diagram Eye diagram data values Link rate GHz Cheetah NS 10K.2 FC Product Manual, Rev. B Presales Support Seagate Technology support servicesTechnical Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Index FCP Flogi Plogi Page See also cooling Page Seagate Technology LLC
Top Page Image Contents