Seagate ES.2 FC, ST31000640FC manual 51.87

Page 42

The drive firmware error recovery algorithms consists of 11 levels for read recoveries and five levels for write. Each level may consist of multiple steps, where a step is defined as a recovery function involving a single re- read or re-write attempt. The maximum level used by the drive in LBA recovery is determined by the read and write retry counts.

Table 3 equates the read and write retry count with the maximum possible recovery time for read and write recovery of individual LBAs. The times given do not include time taken to perform reallocations. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the RC bit is zero, and the recov- ery time limit for the command has not yet been met. Time needed to perform reallocation is not counted against the recovery time limit.

When the RC bit is one, reallocations are disabled even if the ARRE or AWRE bits are one. The drive will still perform data recovery actions within the limits defined by the Read Retry Count, Write Retry Count, and Recovery Time Limit parameters. However, the drive does not report any unrecovered errors.

Table 3: Read and write retry count maximum recovery times

Read retry count1

Maximum recovery time per

LBA (cumulative, msec)

 

 

0

51.87

 

 

1

59.85

 

 

2

203.49

 

 

3

231.42

 

 

4

297.38

 

 

5

323.62

 

 

6

355.54

 

 

7

439.39

 

 

8

507.39

 

 

9

539.31

 

 

10

567.24

 

 

11 (default)

1468.74

 

 

Write retry count1

Maximum recovery time per

LBA (cumulative, msec)

 

 

0

23.94

 

 

1

35.91

 

 

2

55.86

 

 

3

67.83

 

 

4

119.79

 

 

5 (default)

147.72

 

 

[1]These values are subject to change.

Setting these retry counts to a value below the default setting could result in an increased 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 297.38 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 Recovery Time Limit field to 00 01.

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Barracuda ES.2 FC Product Manual, Rev. B

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Contents Barracuda ES.2 FC ST31000640FCPage Barracuda ES.2 FC Product Manual, Rev. B Barracuda ES.2 FC Product Manual, Rev. B Contents Installation Physical/electrical specificationsDefect and error management Interface requirementsSeagate Technology support services Barracuda ES.2 FC Product Manual, Rev. B Scope Barracuda ES.2 FC Product Manual, Rev. B Electromagnetic compatibility Standards, compliance and reference documentsStandards Electromagnetic susceptibilityCompliance Reference documents Ncits TR-19Barracuda ES.2 FC Product Manual, Rev. B General description Standard features Media descriptionFormatted capacities PerformanceReliability Programmable drive capacityFactory-installed options User-installed accessoriesAccess time Performance characteristicsInternal drive characteristics Format command execution time minutesGeneral performance characteristics Start/stop timePrefetch/multi-segmented cache control Cache operation Caching write dataPrefetch operation Recoverable Errors Reliability specificationsError rates Unrecoverable ErrorsInterface errors Reliability and serviceSeek errors Preventive maintenancePerformance impact 4 S.M.A.R.TControlling S.M.A.R.T MillisecondsPredictive failures Reporting controlDetermining rate Thermal monitorDrive Self Test DST State of the drive prior to testingParameter Code Description DST failure definitionShort test Function Code 001b Invoking DSTShort and extended tests Extended test Function Code 010bShipping Product warrantyAbort Product repair and return informationBarracuda ES.2 FC Product Manual, Rev. B DC power requirements Physical/electrical specificationsAC power requirements DC power requirements Gbit AmpsGeneral DC power requirement notes Power sequencingConducted noise immunity Current profiles Power dissipation Temperature Environmental limitsRelative humidity Shock and vibration Package size Packaged/product weight Drop heightEffective altitude sea level ShockAcoustics Air cleanlinessVibration Corrosive environmentX表示该部件（于同类物品程度上）所含的危险和有毒物质中国RoHS MCV标准所定义的门槛值。 China Restriction of Hazardous Substances RoHS Directive Mechanical specifications Mounting configuration dimensionsBarracuda ES.2 FC Product Manual, Rev. B Defect and error management Drive internal defects/errorsDrive error recovery procedures 51.87 FC-AL system errors Background Media ScanMedia Pre-Scan Deferred Auto-Reallocation Idle Read After WriteDrive orientation InstallationDrive ID/option selection CoolingDrive mounting Air flowGrounding Barracuda ES.2 FC Product Manual, Rev. B Link services supported Type of frame FC-AL featuresFibre Channel link service frames Interface requirementsFibre Channel task management functions Fibre Channel task management responsesFC Scsi FCP response codes Function name Response code Fibre Channel port login NPort login Plogi payload BytesNPort Login Accept ACC payload Bytes Fibre Channel port login acceptFibre Channel Process Login Process Login Plri payloadProcess Login Accept ACC payload Bytes Fibre Channel Process Login AcceptFibre Channel fabric login Fabric Login Flogi payload BytesFibre Channel fabric accept login Fabric Login Accept ACC payload BytesFC-AL options supported Dual port supportFibre Channel Arbitrated Loop options Option SupportedScsi commands supported Supported commands Command code Command nameVerify error recovery page 07h Barracuda ES.2 FC Product Manual, Rev. B Temperature page 0Dh Mode Sense data Inquiry dataBarracuda ES.2 FC inquiry data Bytes Data hex Page Block Descriptor Mode Sense Pages Data Supported Feature or condition Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous statusPhysical characteristics FC-AL physical interfacePhysical description Connector requirements Electrical descriptionPin descriptions FC-SCA pin descriptions Pin Signal name Signal type Pin Signal name Signal typeFC-AL transmitters and receivers Power Fault LED OutEnable port bypass signals Active LED OutMotor start controls Parallel Enclosure Services Interface ESI 11 SEL6 through SEL0 ID linesSetting Arbitrated loop physical address Alpa valuesHex Dec Signal characteristics TTL input characteristicsDevice control codes LED driver signals FC Differential outputFC Differential input Receive eye diagram Eye diagram data values Link rate GHz Barracuda ES.2 FC Product Manual, Rev. B Presales Support Seagate Technology support servicesInternet Technical SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index NumericsFAN Flogi Plogi SEL ID See also cooling
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