Seagate ST973451SS manual ST936751SS in 3 Gbit operation, ST936751SS in 1.5 Gbit operation

Page 36

ST936751SS in 3 Gbit operation

Typical power dissipation under idle conditions in 3Gb operation is 5.62 watts (19.18 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	5Vo lt A
											5Vo lt A
											12 Vo lt 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 5. ST936751SS (3 Gbit) DC current and power vs. input/output operations per second

ST936751SS in 1.5 Gbit operation

Typical power dissipation under idle conditions in 1.5 Gbit operation is 5.77 watts (19.69 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 6. ST936751SS (1.5 Gbit) DC current and power vs. input/output operations per second

28	Savvio 15K SAS Product Manual, Rev. B

Image 36

Contents Savvio 15K SAS 100407739 Rev. BPage Revision status summary sheet Savvio 15K SAS Product Manual, Rev. B Contents Defect and error management InstallationSeagate Technology support services Interface requirementsList of Figures Page Scope Savvio 15K SAS Product Manual, Rev. B Applicable standards and reference documentation StandardsElectromagnetic compatibility Electromagnetic susceptibilityElectromagnetic compliance Electromagnetic compliance for the European UnionAustralian C-Tick Korean MICReference documents European Union Restriction of Hazardous Substances RoHSSavvio 15K SAS Product Manual, Rev. B General description Standard features Media descriptionPerformance Factory-installed accessories ReliabilityFormatted capacities Programmable drive capacityOptions Performance characteristics Internal drive characteristicsSeek performance characteristics Access time Gen 2.0 LP dataFormat command execution time General performance characteristicsStart/stop time Prefetch/multi-segmented cache controlCache operation Caching 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 Reporting controlTemperature Log Page 0Dh Predictive failuresThermal monitor Parameter Code DescriptionState of the drive prior to testing DST failure definitionImplementation Invoking DSTProduct warranty Short test Function Code 001bExtended test Function Code 010b Log page entriesShipping Product repair and return informationSavvio 15K SAS Product Manual, Rev. B Physical/electrical specifications AC power requirementsDC power requirements ST973451SS DC power requirementsST936751SS DC power requirements General DC power requirement notesPower sequencing Conducted noise immunityCurrent profiles Typical ST936751SS current profile Power dissipation ST973451SS in 3 Gbit operationST973451SS in 1.5 Gbit operation ST936751SS in 3 Gbit operation ST936751SS in 1.5 Gbit operationTemperature Environmental limitsRelative humidity Effective altitude sea level Shock and vibrationShock Recommended mounting Air cleanliness VibrationCorrosive environment Acoustics Mechanical specifications Mounting configuration dimensionsDefect and error management Drive internal defects/errorsDrive error recovery procedures SAS system errors Background Media Scan Media Pre-ScanDeferred Auto-Reallocation Idle Read After Write Installation Drive orientationCooling Air flowDrive mounting GroundingSavvio 15K SAS Product Manual, Rev. B SAS features Interface requirementsDual port support Scsi commands supported Commands supported by Savvio SAS family driveCommands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Mode Sense data Inquiry dataSavvio inquiry data Page Mode Data Header 04 45 dc cc 00 00 02 Miscellaneous operating features and conditions Miscellaneous featuresMiscellaneous status SAS physical interface Datum B Section C C Section a a Physical characteristics Connector requirementsElectrical description Pin descriptionsSAS pin descriptions SAS transmitters and receiversSignal characteristics General interface characteristics Eye masks Eye masks overviewReceive eye mask Jitter tolerance masks Z1 OPTransmitter signal characteristics Peak-toSinusoidal JitterReceiver signal characteristics Maximum allowable jitter Receiver jitter toleranceCompliant jitter test pattern Cjtpat Impedance specifications Impedance requirements Sheet 1Transmitter characteristics Impedance requirements Sheet 2Electrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Savvio 15K SAS Product Manual, Rev. B Seagate Technology support services InternetPresales Support Technical SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index NumericsPage SAS See also cooling