Seagate ST3300557SS manual SAS System Errors, Read and write retry count maximum recovery times

Page 39

Table 6 Read and write retry count maximum recovery times [1]

READ RETRY

MAXIMUM RECOVERY TIME PER LBA

COUNT

(CUMULATIVE, MSEC)

 

 

0

51.87

 

 

1

59.85

 

 

2

203.49

 

 

3

231.42

 

 

4

295.26

 

 

5

327.18

 

 

6

359.10

 

 

7

446.88

 

 

8

538.65

 

 

9

570.57

 

 

10

598.50

 

 

11 (default)

1,534.97

 

 

WRITE

MAXIMUM RECOVERY TIME PER LBA

RETRY

(CUMULATIVE, MSEC)

COUNT

 

 

 

0

23.94

 

 

1

35.91

 

 

2

39.9

 

 

3

51.87

 

 

4

79.8

 

 

5 (default)

107.73

 

 

[1]These values are subject to change.

Setting these retry counts to a value below the default setting could result in degradation of the unrecovered error rate which may exceed the value given in this product manual. A setting of zero (0) will result in the drive not performing error recovery.

For example, suppose the read/write recovery page has the RC bit set to 0, read retry count set to 4, and the recovery time limit field (Mode Sense page 01, bytes 10 and 11) set to FF FF hex (maximum). A four LBA Read command is allowed to take up to 253.11 msec recovery time for each of the four LBAs in the command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command is allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery Time Limit field allows finer granularity on control of the time spent in error recovery. The recovery time limit only starts counting when the drive is executing error recovery and it restarts on each command. Therefore, each command’s total recovery time is subject to the recovery time limit. Note: A recovery time limit of 0 will use the drive’s default value of FF FF. Minimum recovery time limit is achieved by setting the Recov- ery Time Limit field to 00 01.

9.3SAS SYSTEM ERRORS

Information on the reporting of operational errors or faults across the interface is given in the SAS Interface Manual. The SSP Response returns information to the host about numerous kinds of errors or faults. The Receive Diagnostic Results reports the results of diagnostic operations performed by the drive.

Status returned by the drive to the initiator is described in the SAS Interface Manual. Status reporting plays a role in systems error management and its use in that respect is described in sections where the various commands are discussed.

CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F

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Contents SED Fips 140-2 models Standard models Self-Encrypting Drive modelsPage Contents Interface Requirements Defect and Error ManagementInstallation About Fips About SELF-ENCRYPTING DrivesCheetah 15K.7 SAS Product MANUAL, REV. F III Seagate Technology Support Services Scope Fips 140-2 L EvelSED STANDARDS, Compliance and Reference Documents StandardsCompliance European Union Restriction of Hazardous Substances Rohs Australian C-TickKorean KCC Taiwanese BsmiGeneral Description Standard Features Media DescriptionPerformance ST3600057SS ST3450857SS ST3300657FC FACTORY-INSTALLED OptionsReliability Formatted CapacitiesFormat command execution time minutes Performance CharacteristicsInternal Drive Characteristics Access timeGeneral performance characteristics START/STOP TimePREFETCH/MULTI-SEGMENTED Cache Control Cache Operation Prefetch operation Caching write dataReliability Specifications Error RatesReliability and Service Controlling S.M.A.R.T Preventive maintenanceHot plugging the drive 4 S.M.A.R.TDetermining rate Performance impactMilliseconds Reporting controlDST failure definition Temperature Log Page 0DhParameter Code Description Drive Self Test DSTShort and extended tests State of the drive prior to testingImplementation Invoking DSTShipping Product warrantyLog page entries Abort600 GB DC power requirements PHYSICAL/ELECTRICAL SpecificationsAC Power Requirements DC Power Requirements450 GB DC power requirements 300 GB DC power requirements Power sequencing Conducted noise immunityCurrent profiles Typical 450GB current profiles Power Dissipation Temperature a. Operating 300GB modelEnvironmental Limits Effective altitude sea level a. Operating Relative humidityShock Shock and vibrationRecommended mounting VibrationRoHS compliance statement Air cleanlinessAcoustics Corrosive environmentUnits of Measure mm inches Mechanical SpecificationsPurpose Validation ProgramSeagate Enterprise SED Random Number Generator RNG Controlled AccessAbout SELF-ENCRYPTING Drives Data EncryptionDrive Locking Authenticated Firmware DownloadPower Requirements Supported CommandsDefect and Error Management Drive Internal DEFECTS/ERRORSDrive Error Recovery Procedures Read and write retry count maximum recovery times SAS System ErrorsIdle Read After Write Background Media ScanMedia PRE-SCAN Deferred AUTO-REALLOCATIONInstallation Drive OrientationCooling Grounding Drive MountingTask management responses SAS FeaturesInterface Requirements Task management functionsCommands supported by Cheetah 15K.7 SAS family drives Scsi Commands SupportedCommands supported by Cheetah 15K.7 SAS family drives Commands supported by Cheetah 15K.7 SAS family drives Mode Sense data Inquiry dataCheetah 15K.7 inquiry data Cheetah 15K.7 SAS Product MANUAL, REV. F 11.3.2.1 600GBmodel Mode Sense data 11.3.2.2 450GB model Mode Sense data 11.3.2.3 300GB model Mode Sense data SAS physical interface Miscellaneous Operating Features and ConditionsSupported Feature or condition Miscellaneous featuresDatum B This Area Pin descriptions Physical characteristicsConnector requirements Electrical descriptionReady LED Out PowerSignal Characteristics SAS transmitters and receiversAdditional Information Differential signalsSAS-2 Specification Compliance BPSIndex Page SAS See also cooling Americas Seagate Technology LLC
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