Seagate ST9300653SS, ST9300553SS manual Reliability and service, Seek errors, Interface errors

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6.1.3Seek 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.

6.1.4Interface 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.

6.2Reliability and service

You can enhance the reliability of Savvio disk drives by ensuring that the drive receives adequate cooling. Sec- tion 7.0 provides temperature measurements and other information that may be used to enhance the service life of the drive. Section 11.2 provides recommended air-flow information.

6.2.1Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF)

The production disk drive shall achieve an AFR of 0.44% (MTBF of 2,000,000 hours) when operated in an environment that ensures the HDA case temperatures do not exceed the values specified in Section 7.5. Oper- ation at case temperatures outside the specifications in Section 7.5 may increase the product AFR (decrease the MTBF). The AFR (MTBF) is a population statistic not relevant to individual units.

The AFR (MTBF) specification is based on the following assumptions:

•8760 power-on hours per year.

•250 average on/off cycles per year.

•Operations at nominal voltages.

•Systems will provide adequate cooling to ensure the case temperatures specified in Section 7.5 are not exceeded. Temperatures outside the specifications in Section 7.5 will increase the product AFR and decrease the MTBF.

6.2.2Preventive maintenance

No routine scheduled preventive maintenance is required.

6.2.3Hot plugging the drive

When a disk 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 required to insure data integrity.

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Savvio 15K.3 SAS Product Manual, Rev. A

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Contents ST9300653SSST9300553SS ST9146853SSST9146753SS ST9300453SS ST9146653SSStandard Models Self-Encrypting Drive Models SED FIPS140-2 ModelsPage Contents Defect and error management InstallationAbout Fips About self-encrypting drives Interface requirementsPage Savvio 15K.3 SAS Product Manual, Rev. a List of Figures Page Seagate Technology support services Seagate Online Support and ServicesScope Applicable standards and reference documentation StandardsElectromagnetic compatibility Electromagnetic susceptibilityElectromagnetic compliance Electromagnetic compliance for the European UnionAustralian C-Tick Korean KCCEuropean Union Restriction of Hazardous Substances RoHS Scsi Commands Reference Manual SAS Interface Manual Reference documentsGeneral description Standard features Media descriptionPerformance ReliabilityFormatted capacities Factory installed options Programmable drive capacityPerformance characteristics Internal drive characteristicsSeek performance characteristics Access timeFormat command execution time General performance characteristicsStart/stop time Prefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationReliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Seek errorsInterface errors Preventive maintenanceMaximum processing delay 4 S.M.A.R.TControlling S.M.A.R.T Performance impactTemperature Log Page 0Dh Parameter Code Description Predictive failuresThermal monitor State of the drive prior to testing Drive Self Test DSTDST failure definition ImplementationShort and extended tests Short test Function Code 001bExtended test Function Code 010b Log page entriesProduct warranty ShippingProduct repair and return information StoragePhysical/electrical specifications PowerChoiceTM power managementPowerChoice modes AC power requirements DC power requirements300GB models DC power requirements Regulation146GB models DC power requirements General DC power requirement notes Power sequencingConducted noise immunity Current profiles Current profile for 300GB modelsCurrent profile for 146GB models Power dissipation 300GB models in 6Gb operation300GB models in 3Gb operation 146GB models in 6Gb operation 146GB models in 3Gb operationTemperature a. Operating Environmental limitsRelative humidity Effective altitude sea level a. Operating Shock and vibrationShock Vibration a. Operating-normal Recommended mountingAir cleanliness Corrosive environmentAcoustics Mechanical specifications DimensionsAbout Fips PurposeLevel 2 security Controlled access Admin SPAbout self-encrypting drives Data encryptionDefault password Random number generator RNGDrive locking Data bandsAuthenticated firmware download Power requirementsSupported commands Cryptographic eraseDefect and error management Drive internal defects/errorsDrive error recovery procedures SAS system errors Background Media ScanMedia Pre-Scan Deferred Auto-ReallocationIdle Read After Write Setting and determining the current Type Level Protection Information PILevels of PI Identifying a Protection Information driveInstallation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsScsi commands supported Supported commandsDual port support Supported commands Supported commands Supported commands Mode Sense data Inquiry dataSavvio inquiry data Page Mode Data Header Mode Data Header 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 descriptionsSignal characteristics PowerSAS transmitters and receivers Ready LED OutSAS-2 Specification compliance LED drive signalDifferential signals General interface characteristicsIndex NumericsPage Msid Mtbf See also cooling Page Savvio 15K.3 SAS Product Manual, Rev. a
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