Seagate ST936751SS manual Power dissipation, ST973451SS in 3 Gbit operation

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6.3Power dissipation

ST973451SS in 3 Gbit operation

Typical power dissipation under idle conditions in 3Gb operation is 5.93 watts (20.23 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.

CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB)

Random 8 Block Reads

	1.400									14.00	5Volt A
											5Volt A
											12 Volt A
	1.200									12.00	Watts
											Watts
	1.000									10.00	Power (watts)
Amperes	0.800									8.00
	0.600									6.00

	0.400									4.00
	0.200									2.00
	0.000									0.00
	0.0	50.0	100.0	150.0	200.0	250.0	300.0	350.0	400.0	450.0

I/Os per Second

Figure 3. ST973451SS (3 Gbit) DC current and power vs. input/output operations per second

ST973451SS in 1.5 Gbit operation

Typical power dissipation under idle conditions in 1.5 Gbit operation is 5.98 watts (20.41 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.

CURRENT/POWER vs THROUGHPUT (SAS - 1.5GB)

Random 8 Block Reads

	1.400									14.00	5Volt A
											5Volt A
											12 Volt A
	1.200									12.00	Watts
											Watts
	1.000									10.00	Power (watts)
Amperes	0.800									8.00
	0.600									6.00

	0.400									4.00
	0.200									2.00
	0.000									0.00
	0.0	50.0	100.0	150.0	200.0	250.0	300.0	350.0	400.0	450.0

I/Os per Second

Figure 4. ST973451SS (1.5 Gbit) DC current and power vs. input/output operations per second

Savvio 15K SAS Product Manual, Rev. B

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Contents 100407739 Rev. B Savvio 15K SASPage Revision status summary sheet Savvio 15K SAS Product Manual, Rev. B Contents Interface requirements Defect and error managementInstallation Seagate Technology support servicesList of Figures Page Scope Savvio 15K SAS Product Manual, Rev. B Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityKorean MIC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickEuropean Union Restriction of Hazardous Substances RoHS Reference documentsSavvio 15K SAS Product Manual, Rev. B General description Performance Standard featuresMedia description Programmable drive capacity Factory-installed accessoriesReliability Formatted capacitiesOptions Access time Gen 2.0 LP data Performance characteristicsInternal drive characteristics Seek performance characteristicsGeneral performance characteristics Format command execution timeCache operation Start/stop timePrefetch/multi-segmented cache control Prefetch operation Caching write dataUnrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsReporting control 4 S.M.A.R.TControlling S.M.A.R.T Performance impactParameter Code Description Temperature Log Page 0DhPredictive failures Thermal monitorInvoking DST State of the drive prior to testingDST failure definition ImplementationLog page entries Product warrantyShort test Function Code 001b Extended test Function Code 010bProduct repair and return information ShippingSavvio 15K SAS Product Manual, Rev. B ST973451SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirementsGeneral DC power requirement notes ST936751SS DC power requirementsCurrent profiles Power sequencingConducted noise immunity Typical ST936751SS current profile ST973451SS in 1.5 Gbit operation Power dissipationST973451SS in 3 Gbit operation ST936751SS in 1.5 Gbit operation ST936751SS in 3 Gbit operationRelative humidity TemperatureEnvironmental limits Shock Effective altitude sea levelShock and vibration Recommended mounting Corrosive environment Air cleanlinessVibration Acoustics Mounting configuration dimensions Mechanical specificationsDrive error recovery procedures Defect and error managementDrive internal defects/errors SAS system errors Deferred Auto-Reallocation Background Media ScanMedia Pre-Scan Idle Read After Write Drive orientation InstallationAir flow CoolingGrounding Drive mountingSavvio 15K SAS Product Manual, Rev. B Interface requirements SAS featuresDual port support Commands supported by Savvio SAS family drive Scsi commands supportedCommands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Savvio inquiry data Mode Sense dataInquiry data Page Mode Data Header 04 45 dc cc 00 00 02 Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Datum B Section C C Section a a Pin descriptions Physical characteristicsConnector requirements Electrical descriptionSAS transmitters and receivers SAS pin descriptionsSignal characteristics Receive eye mask General interface characteristicsEye masks Eye masks overview Z1 OP Jitter tolerance masksJitter Transmitter signal characteristicsPeak-to SinusoidalReceiver signal characteristics Compliant jitter test pattern Cjtpat Maximum allowable jitterReceiver jitter tolerance Impedance requirements Sheet 1 Impedance specificationsElectrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Shows the zero-length test load Receiver characteristics Savvio 15K SAS Product Manual, Rev. B Technical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Numerics IndexPage SAS See also cooling