Seagate ST973401SS Reporting control, Determining rate, Predictive failures, Thermal monitor

Page 26

Reporting control

Reporting is controlled by the MRIE bits in the Informational Exceptions Control mode page (1Ch). Subject to the reporting method, the firmware will issue to the host an 01-5Dxx sense code. The error code is preserved through bus resets and power cycles.

Determining rate

S.M.A.R.T. monitors the rate at which errors occur and signals a predictive failure if the rate of degraded errors increases to an unacceptable level. To determine rate, error events are logged and compared to the number of total operations for a given attribute. The interval defines the number of operations over which to measure the rate. The counter that keeps track of the current number of operations is referred to as the Interval Counter.

S.M.A.R.T. measures error rates. All errors for each monitored attribute are recorded. A counter keeps track of the number of errors for the current interval. This counter is referred to as the Failure Counter.

Error rate is the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of error is to set thresholds for the number of errors and their interval. If the number of errors exceeds the threshold before the interval expires, the error rate is considered to be unacceptable. If the number of errors does not exceed the threshold before the interval expires, the error rate is considered to be acceptable. In either case, the inter- val and failure counters are reset and the process starts over.

Predictive failures

S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firm- ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accom- plish this, a counter is incremented each time the error rate is unacceptable and decremented (not to exceed zero) whenever the error rate is acceptable. If the counter continually increments such that it reaches the pre- dictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History Counter. There is a separate Failure History Counter for each attribute.

5.2.5Thermal monitor

Savvio drives implement a temperature warning system which:

1.Signals the host if the temperature exceeds a value which would threaten the drive.

2.Signals the host if the temperature exceeds a user-specified value.

3.Saves a S.M.A.R.T. data frame on the drive which exceeds the threatening temperature value.

A temperature sensor monitors the drive temperature and issues a warning over the interface when the tem- perature exceeds a set threshold. The temperature is measured at power-up and then at ten-minute intervals after power-up.

The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the speci- fied limit in compliance with the SCSI standard. The drive temperature is reported in the FRU code field of mode sense data. You can use this information to determine if the warning is due to the temperature exceeding the drive threatening temperature or the user-specified temperature.

This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC) mode page (1Ch).

The current algorithm implements two temperature trip points. The first trip point is set at 65°C which is the maximum temperature limit according to the drive specification. The second trip point is user-selectable using the Log Select command. The reference temperature parameter in the temperature log page (see Table 11)

20

Savvio SAS Product Manual, Rev. D

Page 25 Page 27
Image 26
Page 25 Page 27
Contents Savvio SAS ST973401SS ST936701SSPage Contents Seagate Technology support services Defect and error managementInstallation Interface requirementsList of Figures Page Scope Savvio family disc driveSavvio SAS Product Manual, Rev. D Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityAustralian C-Tick Electromagnetic complianceElectromagnetic compliance for the European Union Korean MICReference documents SAS Interface ManualSavvio SAS Product Manual, Rev. D General description Performance Standard featuresMedia description Formatted capacities Factory-installed accessoriesReliability Programmable drive capacityFactory-installed options User-installed accessoriesSeek performance characteristics Performance characteristicsInternal drive characteristics Access timeFormat command execution time for 512-byte sectors minutes General performance characteristicsCache operation Start/stop timePrefetch/multi-segmented cache control Caching write data Prefetch operation Savvio SAS Product Manual, Rev. D Recoverable Errors Reliability specificationsError rates Unrecoverable ErrorsInterface errors Reliability and serviceSeek errors Preventive maintenanceControlling S.M.A.R.T Hot plugging the drive4 S.M.A.R.T Performance impactPredictive failures Reporting controlDetermining rate Thermal monitorDST failure definition Temperature Log Page 0Dh Parameter Code DescriptionDrive Self Test DST ImplementationShort and extended tests State of the drive prior to testingInvoking DST Short test Function Code 001bAbort Product warrantyLog page entries ShippingProduct repair and return information DC power requirements Physical/electrical specificationsAC power requirements ST973401SS DC power requirementsST936701SS Gbit mode Amps ST936701SS DC power requirementsGeneral DC power requirement notes Current profiles Power sequencingConducted noise immunity +5V +12VTypical ST973401SS drive +12V current profile Typical ST936701SS drive +12V current profile ST973401SS in 1.5 Gbit operation Power dissipationST973401SS in 3 Gbit operation ST936701SS in 3 Gbit operation ST936701SS in 1.5 Gbit operationRelative humidity TemperatureEnvironmental limits Shock Effective altitude sea levelShock and vibration Package size Packaged/product weight Drop height Recommended mountingCorrosive environment Air cleanlinessVibration Acoustics Mechanical specifications Mounting configuration dimensionsSavvio SAS Product Manual, Rev. D Drive error recovery procedures Defect and error managementDrive internal defects/errors SAS system errors Installation Drive orientationCooling Air flowDrive mounting GroundingSavvio SAS Product Manual, Rev. D SAS features Interface requirementsDual port support Command name Command code Supported Scsi commands supportedCommands supported by Savvio SAS family drive Commands 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 Bytes Data hexPage DEF CHG Savvio SAS Product Manual, Rev. D Supported Feature or condition Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous statusSAS physical interface Datum B Section C C Section a a Electrical description Physical characteristicsConnector requirements Pin descriptionsSAS transmitters and receivers Pin Signal name Signal typeSAS pin descriptions Signal characteristics Eye masks Eye masks overview General interface characteristicsCharacteristic Units Gbps Receive eye maskJitter tolerance masks Reveive tolerance eye maskJitter Peak-toSinusoidal Frequency in kHzTransmitter signal characteristics Signal characteristica Units GbpsMaximum allowable jitter Receiver signal characteristicsSignal characteristic Units Gbps Gbps m, n Deterministic jitterqCompliant jitter test pattern Cjtpat Impedance specificationsReceiver jitter tolerance Impedance requirements Sheet 1Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Tctf Receiver characteristics ISI loss example at 1.5 GbpsSavvio SAS Product Manual, Rev. D Presales Support Seagate Technology support servicesInternet Technical SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index NumericsPage SAS See also cooling
Related manuals
Manual 1 pages 21.51 Kb

ST936701SS, ST973401SS specifications

The Seagate ST936701SS and ST973401SS are high-performance enterprise hard drives designed for optimal data storage solutions in demanding environments. Both models belong to Seagate's Savvio series, which is renowned for its reliability and efficiency. These drives are tailored for critical applications such as database management, data warehousing, and online transaction processing.

The ST936701SS comes with a storage capacity of 36.4 GB, while the ST973401SS offers a larger capacity of 73.4 GB. This variance allows users to choose the drive that best suits their storage needs without compromising performance. Both drives utilize a 2.5-inch form factor, making them compact and suitable for high-density storage configurations.

A key feature of these drives is their impressive rotational speed of 10,000 RPM, which enhances data access times and improves overall system responsiveness. This speed allows for reduced latency and faster data transfer rates, critical for applications that require quick retrieval of large datasets.

In terms of technology, these drives utilize the Serial Attached SCSI (SAS) interface, which is favored in enterprise settings for its reliability and speed. SAS provides better performance than traditional SATA drives, particularly when dealing with high workloads, as it supports multiple concurrent connections and higher data throughput.

The ST936701SS and ST973401SS are also equipped with advanced features such as Seagate's Native Command Queuing (NCQ), which optimizes the order in which read and write commands are executed. This results in improved performance under multi-tasking conditions, essential for enterprise servers managing multiple requests simultaneously.

Additionally, both drives incorporate features aimed at enhancing data integrity and reliability. They support End-to-End Data Protection and are designed to endure the rigors of continuous operation, with MTBF (Mean Time Between Failures) ratings that bolster their reputation for durability.

Energy efficiency is another notable characteristic, as both drives are designed to reduce power consumption without sacrificing performance. This is particularly important in enterprise environments where power management contributes to lower operational costs.

In conclusion, the Seagate ST936701SS and ST973401SS drives are robust, reliable storage solutions tailored for enterprise applications. With their high performance, advanced technology features, and capacity options, they provide organizations with the scalability and efficiency required in today’s data-driven landscape. Whether it's for critical data management tasks or high-access applications, these drives stand out as a solid choice for any enterprise storage strategy.
Top Page Image Contents