Dual port support | Seagate ST3450802SS, ST3600002SS specification

9.2Dual port support

Cheetah SAS drives have two independent ports. These ports may be connected in the same or different 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 Gb/sec).

Subject to buffer availability, the Cheetah 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.

38	Cheetah NS 10K.2 SAS Product Manual, Rev. C

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Seagate ST3450802SS, ST3600002SS manual Dual port support

Contents

Cheetah NS 10K.2 SAS ST3600002SS ST3450802SSPage Contents Seagate Technology support services Defect and error managementInstallation Interface requirements Scope Electromagnetic compatibility Standards, compliance and reference documentsStandards Electromagnetic susceptibility Compliance Reference documents General description Performance Standard featuresMedia description Reliability Factory-installed options Formatted capacitiesProgrammable drive capacity Access time Performance characteristicsInternal drive characteristics Seek performance Format command execution time minutes General performance characteristicsStart/stop time Prefetch/multi-segmented cache control Cache operationCaching write data Prefetch operation Recoverable Errors Reliability specificationsError rates Unrecoverable Errors Preventive maintenance Reliability and serviceInterface errors Hot plugging the drive Performance impact 4 S.M.A.R.TControlling S.M.A.R.T Reporting control Thermal monitor Temperature Log Page 0Dh Parameter Code DescriptionPredictive failures Drive Self Test DST DST failure definition Implementation Product warranty Short test Function Code 001bExtended test Function Code 010b Shipping DC power requirements Physical/electrical specificationsAC power requirements ST3600002SS DC power requirements ST3450802SS DC power requirements General DC power requirement notes Power sequencing Conducted noise immunityCurrent profiles Typical ST3600002SS drive +5V and +12V current profiles Power dissipation ST3600002SSST3450802SS Temperature a. Operating Environmental limits Shock and vibration Relative humidityEffective altitude sea level a. Operating Shock Package size Packaged/product weight Drop height Recommended mounting Acoustics Air cleanlinessVibration a. Operating-normal Corrosive environment China Restriction of Hazardous Substances RoHS Directive Mechanical specifications Physical dimensions Defect and error management Drive internal defects/errorsDrive error recovery procedures 77.81 Media Pre-Scan SAS system errorsBackground Media Scan Deferred Auto-Reallocation Idle Read After Write Installation Drive orientation Cooling Air flow Drive mounting Grounding SAS features Interface requirements Dual port support Scsi commands supported Commands supported by Cheetah NS 10K.2 SAS family drives Commands supported by Cheetah NS 10K.2 SAS family drives Commands supported by Cheetah NS 10K.2 SAS family drives Commands supported by Cheetah NS 10K.2 SAS family drives Inquiry data 2Mode Sense dataBytes Data hex Page 2.1 ST3600002SS Mode Sense data Mode Pages 2.2 ST3450802SS 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 Receive eye mask X2OP 0, 5xadditional sinusoidal jitter X1OP Transmitter signal characteristics Signal characteristica Units 5Gb/s 0Gb/s Maximum allowable jitter Receiver signal characteristicsSignal characteristic Units 5Gb/s 0Gb/s 5Gb/s m, n 0Gb/s m, n Deterministic jitterq 5Gb/sa 0Gb/sa Sinusoidal Deterministic Total Receiver jitter toleranceImpedance requirements Sheet 1 Jitterh Impedance requirements Sheet 2 Electrical TxRx connections = -5, 437dB Shows the zero-length test load SAS-2 Specification compliance Receiver characteristicsAdditional information Seagate Technology support services Presales SupportTechnical Support Warranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index Page SAS See also cooling Page Seagate Technology LLC