Seagate ST973451SS Reliability and service, Seek errors, Interface errors, Preventive maintenance

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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.

5.2Reliability and service

You can enhance the reliability of Savvio disc drives by ensuring that the drive receives adequate cooling. Sec- tion 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 Failure (MTBF)

The production disc drive 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. Oper- ation at case temperatures outside the specifications in Section 6.4 may increase the product AFR (decrease the MTBF). The AFR (MTBF) is a population statistic not releveant to individual units.

The AFR (MTBF) specification is based on the following assumptions for Business Critical Storage System environments:

•8,760 power-on hours per year.

•250 average on/off cycles per year.

•Operations at nominal voltages.

•Systems will provide adequate cooling exceeded. Temperatures outside the decrease the MTBF.

to ensure the case temperatures specified in Section 6.4 are not specifications in Section 6.4 will increase the product AFR and

5.2.2Preventive maintenance

No routine scheduled preventive maintenance is required.

5.2.3Hot plugging the drive

When a disc is powered on by switching the power or hot plugged, the drive runs a self test before attempting to communicate on its’ interfaces. When the self test completes successfully, the drive initiates a Link Reset starting with OOB. An attached device should respond to the link reset. If the link reset attempt fails, or any time the drive looses sync, the drive initiated link reset. The drive will initiate link reset once per second but alternates between port A and B. Therefore each port will attempt a link reset once per 2 seconds assuming both ports are out of sync..

If the self-test fails, the drive does not respond to link reset on the failing port.

Note. It is the responsibility of the systems integrator to assure that no temperature, energy, voltage haz- ard, or ESD potential hazard is presented during the hot connect/disconnect operation. Discharge the static electricity from the drive carrier prior to inserting it into the system.

Caution. The drive motor must come to a complete stop prior to changing the plane of operation. This time is

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Savvio 15K SAS Product Manual, Rev. B

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Contents Savvio 15K SAS 100407739 Rev. BPage Revision status summary sheet Savvio 15K SAS Product Manual, Rev. B Contents Defect and error management InstallationSeagate Technology support services Interface requirementsList of Figures Page Scope Savvio 15K SAS Product Manual, Rev. B Applicable standards and reference documentation StandardsElectromagnetic compatibility Electromagnetic susceptibilityElectromagnetic compliance Electromagnetic compliance for the European UnionAustralian C-Tick Korean MICReference documents European Union Restriction of Hazardous Substances RoHSSavvio 15K SAS Product Manual, Rev. B General description Standard features Media descriptionPerformance Factory-installed accessories ReliabilityFormatted capacities Programmable drive capacityOptions Performance characteristics Internal drive characteristicsSeek performance characteristics Access time Gen 2.0 LP dataFormat command execution time General performance characteristicsStart/stop time Prefetch/multi-segmented cache controlCache operation Caching write data Prefetch operationReliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Seek errorsInterface errors Preventive maintenance4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting controlTemperature Log Page 0Dh Predictive failuresThermal monitor Parameter Code DescriptionState of the drive prior to testing DST failure definitionImplementation Invoking DSTProduct warranty Short test Function Code 001bExtended test Function Code 010b Log page entriesShipping Product repair and return informationSavvio 15K SAS Product Manual, Rev. B Physical/electrical specifications AC power requirementsDC power requirements ST973451SS DC power requirementsST936751SS DC power requirements General DC power requirement notesPower sequencing Conducted noise immunityCurrent profiles Typical ST936751SS current profile Power dissipation ST973451SS in 3 Gbit operationST973451SS in 1.5 Gbit operation ST936751SS in 3 Gbit operation ST936751SS in 1.5 Gbit operationTemperature Environmental limitsRelative humidity Effective altitude sea level Shock and vibrationShock Recommended mounting Air cleanliness VibrationCorrosive environment Acoustics Mechanical specifications Mounting configuration dimensionsDefect and error management Drive internal defects/errorsDrive error recovery procedures SAS system errors Background Media Scan Media Pre-ScanDeferred Auto-Reallocation Idle Read After Write Installation Drive orientationCooling Air flowDrive mounting GroundingSavvio 15K SAS Product Manual, Rev. B SAS features Interface requirementsDual port support Scsi commands supported Commands supported by Savvio SAS family driveCommands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Mode Sense data Inquiry dataSavvio inquiry data Page Mode Data Header 04 45 dc cc 00 00 02 Miscellaneous operating features and conditions Miscellaneous featuresMiscellaneous status SAS physical interface Datum B Section C C Section a a Physical characteristics Connector requirementsElectrical description Pin descriptionsSAS pin descriptions SAS transmitters and receiversSignal characteristics General interface characteristics Eye masks Eye masks overviewReceive eye mask Jitter tolerance masks Z1 OPTransmitter signal characteristics Peak-toSinusoidal JitterReceiver signal characteristics Maximum allowable jitter Receiver jitter toleranceCompliant jitter test pattern Cjtpat Impedance specifications Impedance requirements Sheet 1Transmitter characteristics Impedance requirements Sheet 2Electrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Savvio 15K SAS Product Manual, Rev. B Seagate Technology support services InternetPresales Support Technical SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index NumericsPage SAS See also cooling
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