Seagate ST400FX0012, ST100FX0002, ST200FX0002, ST400FX0002 Predictive failures, Thermal monitor

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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 appropriate 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 interval 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.

6.3.5Thermal monitor

Pulsar XT.2 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. (i.e., the reference temperature value)

3.Saves a S.M.A.R.T. data frame on the drive which exceeds 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. Administrators can use this information to determine if the warning is due to the tempera- ture 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 the maximum temper- ature 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 7) can be used to set this trip point. The default value for this drive is listed in the table, however, applications can set it to any value in the range defined. If a temperature is specified that is greater than the maximum allowed in this field, the temperature is rounded down to the maximum allowed. A sense code is sent to the host to indicate the round- ing of the parameter field.

Table 7:

Temperature Log Page (0Dh)

 

 

 

 

 

 

 

 

Parameter Code

Description

 

400GB

200/100GB

 

 

 

 

 

 

0000h

 

Primary Temperature

 

Drive Temperature

 

 

 

 

 

 

0001h

 

Reference Temperature

Default Setting

70°C

65°C

 

Changeable Range

0 to 70°C

0 to 65°C

 

 

 

18

Pulsar XT.2 SAS Product Manual, Rev. B

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Contents ST400FX0002ST400FX0012 ST200FX0002 ST100FX0002 Standard Models Self-Encrypting Drive ModelsRevision history Contents Installation Physical/electrical specificationsDefect and error management About self-encrypting drivesPage Pulsar XT.2 SAS Product Manual, Rev. B List of Figures Page Seagate Technology support services Seagate Online Support and ServicesScope Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityAustralian C-Tick Electromagnetic complianceElectromagnetic compliance for the European Union Korean KCCReference documents China Restriction of Hazardous Substances RoHS DirectiveStandard features General descriptionReliability Media descriptionPerformance Programmable drive capacity Factory-installed optionsFormatted capacities Thin Provisioning Drive Configuration Performance characteristics Performance characteristicsInternal drive characteristics Access timeFormat Mode Dcrt Bit IP Bit 400GB 200GB 100GB PerformanceCaching write data Start/stop timeCache control Reliability specifications Error rates Endurance Management Data Retention Reliability and servicePreventive maintenance Lifetime Endurance ManagementControlling S.M.A.R.T Maximum processing delay Fully-enabled delay4 S.M.A.R.T Performance impactPredictive failures Thermal monitorDST failure definition State of the drive prior to testingDrive Self Test DST ImplementationExtended test Function Code 010b Short and extended testsShort test Function Code 001b Log page entriesProduct repair and return information Product warrantyShipping StorageAC power requirements Physical/electrical specificationsPower specifications DC power requirements 400GB standard model DC power requirements200GB standard model DC power requirements 100GB standard model DC power requirements Conducted noise immunity General DC power requirement notesPower sequencing Current profilesCurrent profiles for 200GB models 200GB models in 6Gb operation Power dissipation400GB models in 6Gb operation 100GB models in 6Gb operation Temperature a. OperatingEnvironmental limits Shock and vibration Relative humidityEffective altitude sea level a. Operating Shock Recommended mountingCorrosive environment Air cleanlinessVibration a. Operating-normal Mechanical specifications Mounting configuration dimensions 400GB modelsWeight Pounds 100 grams About self-encrypting drives Controlled accessAdmin SP Data encryptionDrive locking Default passwordRandom number generator RNG Data bandsSupported commands Authenticated firmware downloadPower requirements Cryptographic eraseSSD Physical format address descriptor Bit Byte Defect and error managementDrive internal defects/errors Background Media Scan Drive error recovery proceduresSAS system errors Auto-ReallocationLevels of PI Setting and determining the current Type LevelProtection Information PI Identifying a Protection Information driveInstallation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsDual port support Scsi commands supported Supported commandsPersistent Reserve Read Capacity Write Mode Sense data Inquiry dataPage Mode Sense data for 400GB drives 14 1a 00 1aMode Sense data for 200GB drives Mode PagesMode Sense values for 100GB drives Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interfaceDatum B Section C C Section a a Electrical description Physical characteristicsConnector requirements Pin descriptionsSAS transmitters and receivers Signal characteristicsPower Ready LED OutDifferential signals SAS-2 Specification complianceLED drive signal General interface characteristicsIndex NumericsPage RNG See also cooling Page Seagate Technology LLC Americas
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