Seagate ST9600205FC, ST9900805FC, ST9450405FC, ST9300605FC manual FC-AL system errors

Page 49

The drive firmware error recovery algorithms consist of 20 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 6 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 6: Read and write retry count maximum recovery times

 

Maximum recovery time per

Read retry count*

LBA (cumulative, msec)

 

 

 

 

1

124.32

 

 

5

621.62

 

 

10

1243.23

 

 

15

1864.85

 

 

20 (default)

2486.47

 

 

Write retry count

Maximum recovery time per

LBA (cumulative, msec)

 

 

0

35.94

 

 

1

53.91

 

 

2

79.89

 

 

3

97.86

 

 

4

175.85

 

 

5 (default)

421.79

 

 

*For read retry count, every tick ~ 5% of total error recovery. Valid range setting is 1-20. e.g. 1 ~ 5%

5 ~ 25%

20 ~ 100%

Setting these retry counts to a value below the default setting could result in degradation of the unrecovered error rate. For example, suppose the read/write recovery page has the RC bit = 0 and if the read retry count is set to 5, this means ~ 25% of error recovery will be executed which consumes 621.62 ms (please refer to the table above). If the limit is reached and a LBA has not yet been recovered (i.e. requires retries beyond 621.62 ms), the command will end with Check Condition status report and unrecoverable read error will be reported.

8.3FC-AL system errors

Information on the reporting of operational errors or faults across the interface is given in the Fibre Channel Interface Manual. The FCP 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 Fibre Channel 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.

Savvio 10K.5 FC Product Manual, Rev. D

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Contents ST9900805FC ST9600205FC ST9450405FC ST9300605FC Savvio 10K.5 FCRevision history Contents Installation Savvio 10K.5 FC Product Manual, Rev. D Iii Savvio 10K.5 FC Product Manual, Rev. D Seagate Online Support and Services Seagate Technology support servicesScope Standards Applicable standards and reference documentationElectromagnetic compatibility Electromagnetic susceptibilityEuropean Union Restriction of Hazardous Substances RoHS China Restriction of Hazardous Substances RoHS Directive Reference documentsGeneral description Media description Standard featuresReliability PerformanceFormatted capacities Programmable drive capacity Factory-installed optionsInternal drive characteristics Performance characteristicsAccess time Seek performanceGeneral performance characteristics Format command execution time minutesStart/stop time Prefetch/multi-segmented cache controlCache operation Prefetch operation Caching write dataError rates Reliability specificationsRecoverable Errors Unrecoverable ErrorsSeek errors Reliability and serviceInterface errors Preventive maintenanceControlling S.M.A.R.T 4 S.M.A.R.TPerformance impact Determining rate Reporting controlPredictive failures Thermal monitorTemperature Log Page 0Dh State of the drive prior to testingDrive Self Test DST DST failure definitionShort and extended tests Invoking DSTShort test Function Code 001b Extended test Function Code 010bAbort Product warrantyStorage PowerChoiceTM power management Physical/electrical specificationsPowerChoice modes AC power requirements DC power requirements for ST9900805FC model 2Gb 4Gb Amps DC power requirementsDC power requirements for ST9600205FC model 2Gb 4Gb Amps DC power requirements for ST9450405FC model 2Gb 4Gb Amps DC power requirements for ST9300605FC model 2Gb 4Gb Amps Power sequencing General DC power requirement notesConducted noise immunity Current profiles Savvio 10K.5 FC Product Manual, Rev. D Savvio 10K.5 FC Product Manual, Rev. D Savvio 10K.5 FC Product Manual, Rev. D ST9900805FC Power dissipationST9600205FC ST9450405FC ST9300605FC Environmental limits Temperature a. OperatingRelative humidity Shock and vibration Effective altitude sea level a. OperatingShock Recommended mounting Vibration a. Operating-normal Air cleanlinessAcoustics Corrosive environment Mounting configuration dimensions Mechanical specificationsDrive internal defects/errors Defect and error managementDrive error recovery procedures FC-AL system errors Media Pre-Scan Background Media ScanDeferred Auto-Reallocation Idle Read After Write Setting and determining the current Type LevelProtection Information PI Levels of PIIdentifying a Protection Information drive Drive ID/option selection InstallationDrive orientation CoolingAir flow Drive mountingGrounding Fibre Channel link service frames FC-AL featuresLink services supported Type of frame Interface requirementsFibre Channel task management responses Fibre Channel task management functionsFC Scsi FCP response codes Function name Response code NPort login Plogi payload Bytes Fibre Channel port loginFibre Channel Process Login Fibre Channel port login acceptNPort Login Accept ACC payload Bytes Process Login Plri payloadFibre Channel fabric login Fibre Channel Process Login AcceptProcess Login Accept ACC payload Bytes Fabric Login Flogi payload BytesFabric Login Accept ACC payload Bytes Fibre Channel fabric accept loginFibre Channel Arbitrated Loop options Dual port supportFC-AL options supported Option SupportedSupported commands Command code Command name Scsi commands supportedVerify error recovery page 07h Savvio 10K.5 FC Product Manual, Rev. D Temperature page 0Dh Inquiry data Mode Sense dataSavvio 10K.5 FC inquiry data Bytes Data hex Page Mode Data Header 00 00 00 00 45 dd 2f b0 00 00 00 00 00 00 02 00 00 00 00 34 65 f8 70 00 00 00 00 00 00 02 00 00 00 00 22 ec b2 5c 00 00 00 00 00 00 02 Supported Feature or condition Miscellaneous operating features and conditionsFC-AL physical interface Physical characteristicsPhysical description Electrical description Connector requirementsPin descriptions FC-AL transmitters and receivers FC-SCA pin descriptions Pin Signal name Signal typeFault LED Out PowerActive LED Out Enable port bypass signalsMotor start controls 10.5.11 SEL6 through SEL0 ID lines Parallel Enclosure Services Interface ESIAlpa SEL ID 10.6.1 TTL input characteristics Signal characteristicsDevice control codes FC Differential output LED driver signalsFC Differential input Receive eye diagram Eye diagram data values Link rate GHz Savvio 10K.5 FC Product Manual, Rev. D Index Devctrlcode Flogi Plogi Page Page Page Savvio 10K.5 FC Product Manual, Rev. D
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