Seagate ST3146756SS (FDE), ST3146854LC, ST3146356SSIM, ST3300056SS (FDE) manual Dual port support

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9.2Dual port support

Cheetah 15K.6 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 Cheetah 15K.6 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.

52	Cheetah 15K.6 SAS Product Manual, Rev. B

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Contents ST3146356SS ST3450856SSST3300656SS Page Contents Defect and error management InstallationSeagate Technology support services Interface requirementsScope Model Number Full Disk Encryption FDECheetah 15K.6 SAS Product Manual, Rev. B Standards, compliance and reference documents StandardsElectromagnetic compatibility Electromagnetic susceptibilityCompliance European Union Restriction of Hazardous Substances RoHSReference documents Cheetah 15K.6 SAS Product Manual, Rev. B General description Performance Standard featuresMedia description Factory-installed options ReliabilityFormatted capacities Programmable drive capacityCheetah 15K.6 SAS Product Manual, Rev. B Performance characteristics Internal drive characteristicsAccess time Seek timeFormat command execution time minutes General performance characteristicsStart/stop time 176 144 100Prefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationReliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Seek errorsInterface errors Preventive maintenance4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact MillisecondsReporting control Determining ratePredictive failures Thermal monitorTemperature Log Page 0Dh Parameter Code Description State of the drive prior to testingDrive Self Test DST DST failure definitionInvoking DST Short and extended testsShort test Function Code 001b Extended test Function Code 010bProduct warranty AbortShipping Product repair and return informationCheetah 15K.6 SAS Product Manual, Rev. B Physical/electrical specifications AC power requirementsDC power requirements ST3450856SS DC power requirementsST3450056SS FDE DC power requirements ST3300656SS DC power requirementsST3450056SS FDE Gbit mode Amps ST3300656SS Gbit mode AmpsST3300056SS FDE DC power requirements ST3146356SS DC power requirementsST3300056SS FDE Gbit mode Amps ST3146356SS Gbit mode AmpsST3146756SS FDE DC power requirements ST3146756SS FDE Gbit mode AmpsCurrent profiles Power sequencingConducted noise immunity Typical 450GB current profiles Typical 146GB current profiles Power dissipation ST3450856SS modelST3450056SS FDE model ST3300656SS model ST3300056SS FDE model ST3146356SS model ST3146756SS FDE model in 3 Gbit operation Temperature Environmental limitsRelative humidity Effective altitude sea levelShock and vibration ShockPackage size Packaged/product weight Drop height Recommended mountingAir cleanliness VibrationAcoustics Corrosive environmentMechanical specifications Physical dimensions Cheetah 15K.6 SAS Product Manual, Rev. B Drive error recovery procedures Defect and error managementDrive internal defects/errors 51.87 Media Pre-Scan SAS system errorsBackground Media Scan Deferred Auto-Reallocation Idle Read After WriteCooling InstallationDrive orientation Air flow Drive mounting GroundingCheetah 15K.6 SAS Product Manual, Rev. B SAS features Interface requirementsDual port support Command name Command code Supported Scsi commands supportedCommands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Inquiry data Bytes Data hexMode Sense data 2.1 ST3450856SS/ST3450056SS Mode Sense data Mode Pages2.2 ST3300656SS/ST3300056SS Mode Sense data 2.3 ST3146356SS/ST3146756SS Mode Sense data Miscellaneous operating features and conditions Miscellaneous featuresMiscellaneous status SAS physical interfacePhysical interface Datum B Physical characteristics Connector requirementsPin Signal name Signal type Electrical descriptionPin descriptions SAS pin descriptionsSignal characteristics PowerSAS transmitters and receivers Ready LED OutLED drive signal Differential signalsGeneral interface characteristics Eye masks Eye masks overviewReceive eye mask Jitter tolerance masksAbsolute amplitude Normalized time in UIPeak-to SinusoidalJitter Frequency in kHzTransmitter signal characteristics Signal characteristica Units GbpsMaximum allowable jitter Receiver signal characteristicsSignal characteristic Units Gbps Impedance specifications Receiver jitter toleranceCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah 15K.6 SAS Product Manual, Rev. B Seagate Technology support services InternetPresales Support Technical SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index NumericsIraw SAS See also cooling