Seagate ST336605LW/LC/LCV, ST373405LW/LWV/LC/LCV manual Scsi systems errors

Page 44

34

Cheetah 73LP Product Manual, Rev. E

Table 3: Read and write retry count maximum recovery times [1]

Read retry

Maximum recovery time per

count [1]

LBA (cumulative, msec)

 

 

 

 

0

77.7

 

 

1

89.7

 

 

2

304.9

 

 

3

328.9

 

 

4

364.6

 

 

5

412.5

 

 

6

520.0

 

 

7

532.0

 

 

8

555.9

 

 

9

609.7

 

 

10

684.1

 

 

11 (default)

1,542.2

 

 

Write retry

Maximum recovery time per

count

LBA (cumulative, msec)

 

 

 

 

0

35.8

 

 

1

53.7

 

 

2

59.7

 

 

3

113.6

 

 

4

227.1

 

 

5 (default)

268.9

 

 

[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 365 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.

7.3SCSI systems errors

Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface Product Manual, part number 77738479. Message Protocol System is described in the SCSI Interface Product Manual. Several of the messages are used in the SCSI systems error management system. The Request Sense command returns information to the host about numerous kinds of errors or faults. The Receive Diag- nostic Results reports the results of diagnostic operations performed by the drive.

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

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Contents ST373405LW/LWV/LC/LCV ST336605LW/LC/LCV Page ST373405LW/LWV/LC/LCV ST336605LW/LC/LCV Page Revision status summary sheet Revision Date Writer/Engineer Sheets AffectedPage Contents Defect and error management InstallationSeagate Technology support services Interface requirementsList of Figures Cheetah 73LP Product Manual, Rev. E ViiPage Scope Cheetah 73LP family drive ST373405LW shownCheetah 73LP Product Manual, Rev. E Applicable standards and reference documentation Taiwanese Bsmi Australian C-TickKorean MIC General description Cheetah 73LP family drive Cheetah 73LP Product Manual, Rev. E Standard features Media characteristicsPerformance ReliabilityFactory installed accessories Options factory installedAccessories user installed Unformatted and formatted capacitiesPerformance characteristics Prefetch/multi-segmented cache control Ultra2 Scsi Ultra3 ScsiStart/stop time Cheetah 73LP Product Manual, Rev. E Cache operation Caching write dataPrefetch operation Reliability specifications Reliability and service Preventive maintenanceService life Service philosophy7 S.M.A.R.T Controlling S.M.A.R.TPerformance impact MillisecondsReporting control Determining rateState of the drive prior to testing DST Failure DefinitionImplementation Invoking DSTShort and extended tests Short test Function Code 001bExtended test Function Code 010b Log page entriesProduct repair and return information Cheetah 73LP Product Manual, Rev. E Product warrantyShipping Cheetah 73LP Product Manual, Rev. E DC power requirements Physical/electrical specificationsAC power requirements 3 12 V Current profile Power sequencingConducted noise immunity Typical ST336605 drive +12 V current profile Typical ST336605 drive +5 V current profile Amperes 000 900 800 700 600 Temperature Cheetah 73LP Product Manual, Rev. E Environmental limitsRelative humidity Effective altitude sea levelShock and vibration ShockRecommended mounting Acoustics Air cleanlinessVibration LW and LWV mounting configuration dimensions LC and LCV mounting configuration dimensions Drive internal defects Defect and error managementDrive error recovery procedures Scsi systems errors Installation Configure drive optionsFormatting Drive ID/option select headerDo not install jumpers retain cover J5 jumper header on LW/LWV models only J2 option select header Cheetah 73LP Product Manual, Rev. E Function description Does not apply to LC/LCV modelDrive orientation CoolingCheetah 73LP Product Manual, Rev. E Drive mounting GroundingCheetah 73LP Product Manual, Rev. E Interface requirements Scsi interface messages supportedScsi interface commands supported Cheetah 73LP Product Manual, Rev. E Cheetah 73LP Product Manual, Rev. E Inquiry Vital Product data Mode Sense data DEF CHG Cheetah 73LP Product Manual, Rev. E Condition/feature supported by Physical interface DC cable and connector2 REQ/ACK offset Pin Power Scsi interface physical description Scsi interface cable requirementsMating connectors Mating connectors for LW and LWV model drivesMating connectors for LC and LCV model drives ST373405LC/LCV and ST336605LC/LCVCheetah 73LP Product Manual, Rev. E Right-angle to Pcba connectors Scsi ID650±.005 155 100 346 Front View GND +DBP1 62Cheetah 73LP Product Manual, Rev. E REQ +REQ Multimode-SE and LVD alternatives LVD output characteristicsElectrical description General cable characteristics Single-ended drivers/receiversCables for low voltage differential drivers/receivers Terminator requirementsLC and LCV drives Disc drive Scsi timing Spindle status Command status LED status Drive activity LEDCheetah 73LP Product Manual, Rev. E Seagate Technology support services Online Services Automated ServicesPresales Support Technical SupportEuropean Support Services Customer Service CSOUSA/Canada/Latin America Support Services Call Center Toll-free Direct dial Africa/Middle East Support ServicesAsia/Pacific Support Services Cheetah 73LP Product Manual, Rev. E Index Cheetah 73LP Product Manual, Rev. E Cheetah 73LP Product Manual, Rev. E Scam Scsi Scsi ID 80Cheetah 73LP Product Manual, Rev. E
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