Dual port support | Seagate ST31000640SSIM manual

9.2Dual port support

Barracuda ES.2 SAS drives have two independent ports. These ports may be connected in the same or differ- ent SCSI domains. Each drive port has a unique SAS address.

The two ports run at the same link rate. The first port to successfully complete speed negotiation sets the link rate support by both ports. When the second port participates in speed negotiation, it indicates the only sup- ported speed is the speed selected by the first port. If the first port to complete speed negotiation looses sync before the second port completes speed negotiation, both ports revert back to the power on condition of allow- ing either link rate (1.5 or 3.0 Gbits/sec).

Subject to buffer availability, the Barracuda ES.2 drives support:

•Concurrent port transfers—The drive supports receiving COMMAND, TASK management transfers on both ports at the same time.

•Full duplex—The drive supports sending XFER_RDY, DATA and RESPONSE transfers while receiving frames on both ports.

44	Barracuda ES.2 SAS Product Manual, Rev. G

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Seagate ST31000640SSIM manual Dual port support

Contents

Barracuda ES.2 SAS ST31000640SS ST3750630SS ST3500620SSPage Physical/electrical specifications Performance characteristicsReliability specifications General description Interface requirements Defect and error managementInstallation Seagate Technology Support Services Barracuda ES.2 SAS Product Manual, Rev Scope Barracuda ES.2 SAS Product Manual, Rev. G Electromagnetic compatibility Standards, compliance and reference documentsStandards Electromagnetic susceptibility Compliance Reference documents Barracuda ES.2 SAS Product Manual, Rev. G General description Barracuda ES.2 drive illustration Performance Standard featuresMedia description Reliability Programmable drive capacity Factory-installed optionsFormatted capacities Barracuda ES.2 SAS Product Manual, Rev. G Access time Performance characteristicsInternal drive characteristics Seek performance Start/stop time Format command execution time minutesGeneral performance characteristics Caching write data Prefetch/multi-segmented cache controlCache operation Prefetch operation Recoverable Errors Reliability specificationsError rates Unrecoverable Errors Interface errors Reliability and serviceSeek errors Preventive maintenance Performance impact 4 S.M.A.R.TControlling S.M.A.R.T Reporting control Thermal monitor Temperature Log Page 0DhPredictive failures Implementation State of the drive prior to testingDST failure definition Invoking DST Extended test Function Code 010b Product warrantyShort test Function Code 001b Log page entries Shipping Product repair and return information Barracuda ES.2 SAS Product Manual, Rev. G DC power requirements Physical/electrical specificationsAC power requirements ST31000640SS DC power requirements ST3750630SS DC power requirements ST3500620SS DC power requirements Conducted noise immunity General DC power requirement notesPower sequencing Current profiles Typical ST31000640SS drive +5V and +12V current profiles Power dissipation Typical ST3500620SS drive +5V and +12V current profiles Barracuda ES.2 SAS Product Manual, Rev. G Temperature a. Operating Environmental limits Shock and vibration Relative humidityEffective altitude sea level a. Operating Shock Package size Packaged/product weight Drop height Acoustics Air cleanlinessVibration a. Operating-normal Corrosive environment See Section Barracuda ES.2 SAS Product Manual, Rev. G Mechanical specifications Physical dimensions Drive error recovery procedures Defect and error managementDrive internal defects/errors 108.29 Media Pre-Scan SAS system errorsBackground Media Scan Deferred Auto-Reallocation Idle Read After Write Installation Drive orientation Cooling Air flow Drive mounting Grounding Barracuda ES.2 SAS Product Manual, Rev. G SAS features Interface requirements Dual port support Command name Command code Supported Scsi commands supportedCommands supported by Barracuda ES.2 SAS family drives Commands supported by Barracuda ES.2 SAS family drives Commands supported by Barracuda ES.2 SAS family drives Commands supported by Barracuda ES.2 SAS family drives Barracuda ES.2 SAS inquiry data Bytes Data hex Mode Sense dataInquiry data Page 2.1 ST31000640SS Mode Sense data Mode Pages 2.2 ST3750630SS Mode Sense data 2.3 ST3500620SS Mode Sense data Supported Feature or condition Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous status SAS physical interface Datum B Physical characteristics Connector requirements Pin descriptions Pin Signal name Signal typeElectrical description SAS pin descriptions SAS transmitters and receivers Signal characteristicsPower Ready LED Out General interface characteristics LED drive signalDifferential signals Eye masks Eye masks overview Absolute amplitude Receive eye maskJitter tolerance masks Normalized time in UI Jitter Peak-toSinusoidal Frequency in kHz Transmitter signal characteristics Signal characteristica Units Gbps Maximum allowable jitter Receiver signal characteristicsSignal characteristic Units Gbps Gbps m, n Deterministic jitterq Compliant jitter test pattern Cjtpat Impedance specificationsReceiver jitter tolerance Impedance requirements Sheet 1 Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Shows the zero-length test load Receiver characteristics Barracuda ES.2 SAS Product Manual, Rev. G