Seagate ST3600057FC manual Reliability and service, Seek errors, Interface errors

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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. 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 Cheetah 15K.6 disc drives by ensuring that the drive receives adequate cool- ing. Section 6.0 provides temperature measurements and other information that may be used to enhance the service life of the drive. Section 9.2 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 environ- ments:

•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 disc 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.

The Pass-through state is disabled while the drive performs self test of the FC interface. The control line for an external port bypass circuit remains in the Enable Bypass state while self test is running. If the bypass circuit is

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Cheetah 15K.7 FC Product Manual, Rev. A

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Contents Cheetah 15K.7 FC Standard models Self-Encrypting Drive modelsPage Contents Defect and error management InstallationAbout self-encrypting drives Interface requirementsSeagate Technology support services Cheetah 15K.7 FC Product Manual, Rev. a Scope Model Number Capacity Self-Encrypting Drive SEDApplicable standards and reference documentation StandardsElectromagnetic compatibility Electromagnetic susceptibilityEuropean Union Restriction of Hazardous Substances RoHS Reference documents Ncits TR-20General description Standard features Media description PerformanceReliability Formatted capacitiesProgrammable drive capacity Factory-installed optionsUser-installed accessories Performance characteristics Internal drive characteristicsSeek performance characteristics Access timePrefetch/multi-segmented cache control General performance characteristicsStart/stop time Cache operation Caching write dataPrefetch operation Reliability 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 MillisecondsTemperature Log Page 0Dh Determining ratePredictive failures Thermal monitorState 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 repair and return information Product warrantyShipping DC power requirements Physical/electrical specificationsAC power requirements ST3600057FC DC power requirements Gbit Amps ST3450857FC DC power requirements Gbit AmpsGeneral DC power requirement notes ST3300657FC DC power requirements Gbit AmpsCurrent profiles Power sequencingConducted noise immunity Typical ST3450857FC current profiles Typical ST3300657FC current profiles Power dissipation 600GB model450GB models 300GB models Temperature a. OperatingEnvironmental limits Relative humidity Effective altitude sea level a. OperatingShock Package size Packaged/product weight Drop heightShock and vibration Recommended mounting Air cleanliness Vibration a. Operating-normalAcoustics Corrosive environmentRoHS compliance statement Electromagnetic susceptibility See SectionMechanical specifications Mounting configuration dimensionsControlled access Admin SPAbout self-encrypting drives Data encryptionDefault password Random number generator RNGDrive locking Data bandsAuthenticated firmware download Power requirementsSupported commands Cryptographic eraseDrive error recovery procedures Defect and error managementDrive internal defects/errors Page FC-AL system errors These values are subject to changeDeferred Auto-Reallocation Background Media ScanMedia Pre-Scan Idle Read After Write Drive orientation InstallationDrive ID/option selection Cooling Air flowDrive mounting GroundingFC-AL features Fibre Channel link service framesLink services supported Type of frame Interface requirementsFC Scsi FCP response codes Function name Response code Fibre Channel task management functionsFibre Channel task management responses Fibre Channel port login NPort login Plogi payload BytesProcess Login Plri payload Fibre Channel port login acceptNPort Login Accept ACC payload Bytes Fibre Channel Process Login Accept Fibre Channel fabric loginProcess Login Accept ACC payload Bytes Fabric Login Flogi payload BytesFibre Channel fabric accept login Fabric Login Accept ACC payload BytesScsi commands supported Dual port supportFibre Channel Arbitrated Loop options FC-AL options supportedSupported commands Cheetah 15K.7 FC Product Manual, Rev. a Cheetah 15K.7 FC Product Manual, Rev. a Background Medium Scan 15h Cheetah 15K.7 FC inquiry data Bytes Data hex Mode Sense dataInquiry data Page Mode Data Header Block Descriptor Ec b2 5c 00 00 02 Miscellaneous operating features and conditions Miscellaneous featuresSupported Feature or condition Miscellaneous statusPhysical description Physical characteristicsFC-AL physical interface Pin descriptions Connector requirementsElectrical description FC-AL transmitters and receivers FC-SCA pin descriptions Pin Signal name Signal typePin Signal name Signal type Power Fault LED OutMotor start controls Enable port bypass signalsActive LED Out Parallel Enclosure Services Interface ESI 10.5.11 SEL6 through SEL0 ID linesHex Dec SettingArbitrated loop physical address Alpa values Device control codes Signal characteristicsTTL input characteristics provides the TTL characteristics FC Differential input LED driver signalsFC Differential output Receive eye diagram Eye diagram data values Link rate GHz Technical Support Seagate Technology support servicesPresales Support Data Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index NumericsDevctrlcode FCP Mtbf Page See also cooling Page Cheetah 15K.7 FC Product Manual, Rev. a Page Seagate Technology LLC
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