Seagate ST3500071FC, ST3400071FC Predictive failures, Thermal monitor, Parameter Code Description

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Error rate is the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of error is to set thresholds for the number of errors and their interval. If the number of errors exceeds the threshold before the interval expires, the error rate is considered to be unacceptable. If the number of errors does not exceed the threshold before the interval expires, the error rate is considered to be acceptable. In either case, the inter- val and failure counters are reset and the process starts over.

Predictive failures

S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firm- ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accom- plish this, a counter is incremented each time the error rate is unacceptable and decremented (not to exceed zero) whenever the error rate is acceptable. If the counter continually increments such that it reaches the pre- dictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History Counter. There is a separate Failure History Counter for each attribute.

5.2.5Thermal monitor

NL35 Series drives implement a temperature warning system which:

1.Signals the host if the temperature exceeds a value which would threaten the drive.

2.Signals the host if the temperature exceeds a user-specified value.

3.Saves a S.M.A.R.T. data frame on the drive which exceed the threatening temperature value.

A temperature sensor monitors the drive temperature and issues a warning over the interface when the tem- perature exceeds a set threshold. The temperature is measured at power-up and then at ten-minute intervals after power-up.

The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the speci- fied limit in compliance with the SCSI standard. The drive temperature is reported in the FRU code field of mode sense data. You can use this information to determine if the warning is due to the temperature exceeding the drive threatening temperature or the user-specified temperature.

This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC) mode page (1Ch).

The current algorithm implements two temperature trip points. The first trip point is set at 68°C which is the maximum temperature limit according to the drive specification. The second trip point is user-selectable using the Log Select command. The reference temperature parameter in the temperature log page (see Table 1) can be used to set this trip point. The default value for this drive is 68°C, however, you can set it to any value in the range of 0 to 68°C. If you specify a temperature greater than 68°C in this field, the temperature is rounded down to 68°C. A sense code is sent to the host to indicate the rounding of the parameter field.

Table 1: Temperature Log page (0Dh)

Parameter Code

Description

 

 

0000h

Primary Temperature

 

 

0001h

Reference Temperature

 

 

When the first temperature trip point is exceeded, S.M.A.R.T. data is collected and a frame is saved to the disc.

NL35 Series FC Product Manual, Rev. D

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Contents ST3500071FC ST3400071FC NL35 Series FCPage Contents Interface requirements Defect and error managementInstallation Seagate Technology support services NL35 Series FC Product Manual, Rev. D NL35 Series family disc drive List of FiguresViii NL35 Series FC Product Manual, Rev. D NL35 Series family disc drive ScopeNL35 Series FC Product Manual, Rev. D Standards Applicable standards and reference documentationElectromagnetic compatibility Electromagnetic susceptibilityEnvironmental protection Electromagnetic complianceFibre Channel Interface Manual Reference documentsNL35 Series FC Product Manual, Rev. D General description Standard features Performance Media descriptionReliability Formatted capacitiesFactory-installed options Factory-installed accessoriesUser-installed accessories Programmable drive capacityInternal drive characteristics Performance characteristicsSeek performance characteristics Access timeGHz Generalized performance characteristicsCache operation Start/stop timePrefetch/multi-segmented cache control Prefetch operation Caching write dataPage NL35 Series FC Product Manual, Rev. D Error rates Reliability specifications Recoverable Errors Reliability and service Unrecoverable errors Seek errorsHot plugging the drive Preventive maintenanceMean Time Between Failure Mtbf Controlling S.M.A.R.T 4 S.M.A.R.TPerformance impact MillisecondsPredictive failures Temperature Log page 0DhThermal monitor Parameter Code DescriptionDrive Self Test DST State of the drive prior to testingDST Failure Definition ImplementationShort and extended tests Invoking DSTShort test Function Code 001b Extended test Function Code 010bAbort Product warrantyShipping Product repair and return informationAC power requirements Physical/electrical specificationsDC power requirements ST3500071FC/ST3400071FC DC power requirementsConducted noise immunity General DC power requirement notesPower sequencing Power dissipation Environmental limits TemperatureRelative humidity Effective altitude sea levelShock Package size Packaged/product weight Drop heightShock and vibration Recommended mounting Vibration Air cleanlinessAcoustics Typical idle mode sound power ST3500071FC and ST3400071FCCorrosive environment Mounting configuration dimensions Mechanical specificationsNL35 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 Air flow CoolingGrounding Drive mountingNL35 Series FC Product Manual, Rev. D Fibre Channel link service frames FC-AL featuresLink services supported Type of frame Link serviceFibre Channel Scsi FCP task management functions Fibre Channel task management functionsFibre Channel task management responses FC Scsi FCP response codesBytes Fibre Channel port loginNPort login Plogi payload NPort Login Accept ACC payload Fibre Channel port login acceptFibre Channel Process Login Process Login Plri payloadProcess Login Accept ACC payload Fibre Channel Process Login AcceptFibre Channel fabric login Fabric Login Flogi payloadFabric Login Accept ACC payload Fibre Channel fabric accept loginFibre Channel Arbitrated Loop options Dual port supportFC-AL options supported Option SupportedCommand code Supported Command name Scsi commands supportedSupported commands Supported commands Supported commands Supported commands Supported commands Inquiry data Mode Sense dataNL35 Series inquiry data Bytes Data hexPage DEF CHG NL35 Series FC Product Manual, Rev. D Miscellaneous features Miscellaneous operating features and conditionsSupported Feature or condition 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 Normal command activity LED status Enable port bypass signalsActive LED Out Active LED Out conditionsParallel Enclosure Services Interface ESI Motor start control signalsMotor start controls 11 SEL6 through SEL0 ID linesHex Dec SettingArbitrated loop physical address Alpa values Signal characteristics LED drive signal LED driver signalsDifferential Pecl output characteristics Differential Pecl input characteristicsLink rate GHz Eye diagram data valuesNL35 Series FC Product Manual, Rev. D Internet Seagate Technology support servicesPresales Support Technical SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Numerics IndexFAN Flogi Plogi Page See also cooling
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