Dual port support | Seagate ST3400755SS specs

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 Gbits/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.

42	Cheetah NS SAS Product Manual, Rev. B

Image 48

Seagate ST3400755SS manual Dual port support

Contents

Cheetah NS SAS ST3400755SSPage Contents Defect and error management InstallationSeagate Technology support services Interface requirements List of Figures Typical ST3400755SS drive +5V and +12V current profiles Cheetah NS SAS Product Manual, Rev. B Scope Cheetah NS SAS Product Manual, Rev. B Standards, compliance and reference documents StandardsElectromagnetic compatibility Electromagnetic susceptibility Compliance Reference documents Cheetah NS SAS Product Manual, Rev. B General description Standard features Media descriptionPerformance Reliability Factory-installed options Formatted capacitiesProgrammable drive capacity ST3400755SS Cheetah NS SAS Product Manual, Rev. B Performance characteristics Internal drive characteristicsAccess time Seek performance Format command execution time minutes General performance characteristicsStart/stop time Prefetch/multi-segmented cache control Cache operationCaching write data Prefetch operation Reliability specifications Error ratesRecoverable Errors Unrecoverable Errors Reliability and service Seek errorsInterface errors Preventive maintenance 4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting control Temperature Log Page 0Dh Predictive failuresThermal monitor State of the drive prior to testing DST failure definitionImplementation Invoking DST Product warranty Short test Function Code 001bExtended test Function Code 010b Log page entries Shipping Product repair and return information Cheetah NS SAS Product Manual, Rev. B Physical/electrical specifications AC power requirementsDC power requirements ST3400755SS DC power requirements General DC power requirement notes Power sequencingConducted noise immunity Current profiles Power dissipation Typical ST3400755SS drive +5V and +12V current profiles Temperature Environmental limits Relative humidity Effective altitude sea levelShock and vibration Shock Package size Packaged/product weight Drop height Recommended mounting Air cleanliness VibrationAcoustics Corrosive environment X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 Physical dimensions Cheetah NS SAS Product Manual, Rev. B Defect and error management Drive internal defects/errorsDrive error recovery procedures 77.87 SAS system errors Background Media ScanMedia Pre-Scan Deferred Auto-Reallocation Idle Read After Write Installation Drive orientation Cooling Air flow Drive mounting Grounding Cheetah NS SAS Product Manual, Rev. B SAS features Interface requirements Dual port support Scsi commands supported Commands supported by Cheetah NS SAS family drivesCommand name Command code Supported Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Mode Sense data Inquiry dataCheetah NS SAS inquiry data Bytes Data hex Page 2.1 ST3400755SS Mode Sense data Mode Pages Miscellaneous operating features and conditions Miscellaneous featuresSupported Feature or condition Miscellaneous status SAS physical interface Datum B Physical characteristics Connector requirements Pin Signal name Signal type Electrical descriptionPin descriptions SAS pin descriptions Signal characteristics PowerSAS transmitters and receivers Ready LED Out LED drive signal Differential signalsGeneral interface characteristics Eye masks Eye masks overview Receive eye mask Jitter tolerance masksAbsolute amplitude Normalized time in UI Peak-to SinusoidalJitter Frequency in kHz Transmitter signal characteristics Signal characteristica Units Gbps Receiver signal characteristics Signal characteristic Units GbpsMaximum allowable jitter Gbps m, n Deterministic jitterq Impedance specifications Receiver jitter toleranceCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1 Transmitter characteristics Impedance requirements Sheet 2Electrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah NS SAS Product Manual, Rev. B Seagate Technology support services InternetPresales Support Technical Support Warranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index NumericsPage SAS See also cooling