Seagate ST373307FC, ST3146807FC manual Defect and error management, Drive internal defects/errors

Page 41

Cheetah 10K.6 FC Product Manual, Rev. B

31

7.0Defect and error management

The drive, as delivered, complies with this product manual. The read error rates and specified storage capaci- ties are not dependent upon use of defect management routines by the host (initiator).

Defect and error management in the SCSI protocol involves the drive internal defect/error management and FC-AL system error considerations (errors in communications between the initiator and the drive). Tools for use in designing a defect/error management plan are briefly outlined in this section. References to other sections are provided when necessary.

7.1Drive internal defects/errors

During the initial drive format operation at the factory, media defects are identified, tagged as being unusable, and their locations recorded on the drive primary defects list (referred to as the “P’ list and also as the ETF defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the Read Defect Data command.

Details of the SCSI commands supported by the drive are described in the Fibre Channel Interface Manual. Also, more information on the drive Error Recovery philosophy is presented in the Fibre Channel Interface Manual.

7.2Drive error recovery procedures

When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery proce- dures to attempt to recover the data. The error recovery procedures used depend on the options previously set in the Error Recovery Parameters mode page. Error recovery and defect management may involve using sev- eral SCSI commands described in the Fibre Channel Interface Manual. The drive implements selectable error recovery time limits required in video applications.

The error recovery scheme supported by the drive provides a way to control the total error recovery time for the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent in error recovery for a command can be limited using the Recovery Time Limit bytes in the Error Recovery mode page. The total amount of time spent in error recovery for a single LBA can be limited using the Read Retry Count or Write Retry Count bytes in the Error Recovery mode page.

The drive firmware error recovery algorithms consists of 12 levels for read recoveries and five levels for write. Each level may consist of multiple steps, where a step is defined as a recovery function involving a single re- read or re-write attempt. The maximum level used by the drive in LBA recovery is determined by the read and write retry counts.

Table 2 equates the read and write retry count with the maximum possible recovery time for read and write recovery of individual LBAs. The times given do not include time taken to perform reallocations. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the RC bit is zero, and the recov- ery time limit for the command has not yet been met. Time needed to perform reallocation is not counted against the recovery time limit.

Page 40 Page 42
Image 41
Page 40 Page 42
Contents Page Page Page Page Revision Date Writer/Engineer Sheets Affected Revision status summary sheetPage Contents Installation Defect and error managementSeagate Technology support services Interface requirementsCheetah 10K.6 FC Product Manual, Rev. B Vii List of FiguresPage Cheetah 10K.6 FC family disc drive ScopeCheetah 10K.6 FC Product Manual, Rev. B Applicable standards and reference documentation Korean MIC Australian C-TickTaiwanese Bsmi Reference documentsCheetah 10K.6 FC disc drive General descriptionMedia description Standard featuresPerformance ReliabilityFactory-installed options Factory-installed accessoriesUser-installed accessories Unformatted and formatted capacitiesCheetah 10K.6 FC Product Manual, Rev. B Internal drive characteristics Performance characteristicsSeek performance characteristics Access time Format command execution time in minutesStart/stop time General performance characteristicsPrefetch/multi-segmented cache control Cache operationCaching write data Prefetch operation Reliability specifications Preventive maintenance Reliability and serviceService life Service philosophyPerformance impact 7 S.M.A.R.TControlling S.M.A.R.T Reporting control MillisecondsDetermining rate Predictive failuresImplementation State of the drive prior to testingInvoking DST Short and extended testsLog page entries Product warrantyAbort ShippingAC power requirements Physical/electrical specificationsDC power requirements General DC power requirement notesConducted noise immunity Power sequencingCurrent profiles +5V +12VTypical ST373307FC drive +12V current profile Typical ST3146807FC drive +5V current profile Typical ST373307FC drive +5V current profile ST373307FC Power dissipation ST3146807FCCheetah 10K.6 FC Product Manual, Rev. B ST336607FC TemperatureEffective altitude sea level Relative humidityShock and vibration ShockPackage size Packaged/product weight Drop height Recommended mounting Acoustics Air cleanlinessCheetah 10K.6 FC Product Manual, Rev. B Vibration Mounting configuration dimensions Mechanical specificationsDrive error recovery procedures Defect and error managementDrive internal defects/errors FC-AL system errors Read retry Maximum recovery time per Write retryRead and write retry count maximum recovery times Maximum recovery time perLED connections InstallationDrive ID/option selection Drive Front 1 J6 connector requirementsDrive orientation CoolingAir flow Drive mountingGrounding Fibre Channel link service frames FC-AL featuresInterface requirements Fibre Channel task management functionsNPort login Plogi payload Bytes Fibre Channel port loginFibre Channel Process Login Accept Fibre Channel Process LoginNPort Login Accept ACC payload Bytes Process Login Plri payloadFabric Login Flogi payload Bytes Fibre Channel fabric loginAccept or NPort Login when sending frames to an initiator Fabric Login Accept ACC payload BytesDual port support Fibre Channel Arbitrated Loop optionsFC-AL options supported Option SupportedSupported commands Command code Command name Command code Supported Command name Supported commandsRead descriptor mode Cheetah 10K.6 FC Product Manual, Rev. B Cheetah 10K.6 FC Product Manual, Rev. B Inquiry data Mode Sense dataCheetah 10K.6 FC inquiry data Bytes Data hexCheetah 10K.6 FC Product Manual, Rev. B DEF DEF CHG Cheetah 10K.6 FC Product Manual, Rev. B Miscellaneous features Miscellaneous operating features and conditionsSupported Feature or condition Miscellaneous statusPhysical description Physical characteristicsPart description Positions Part number Features Connector requirementsFC-SCA pin descriptions Pin Signal name Signal typePin descriptions Fault LED Out PowerFC-AL transmitters and receivers Active LED Out11 SEL6 through SEL0 ID lines Enable port bypass signalsMotor start controls Parallel Enclosure Services Interface ESI Arbitrated loop physical address Alpa values SettingSetting Hex Dec TTL input characteristics Signal characteristicsLED driver signals Device control codesDifferential Pecl input Transmit eye diagramLink rate GHz Eye diagram data valuesAutomated Services Seagate Technology support services Online ServicesPresales Support Technical SupportEuropean Support Services Customer Service CSOUSA/Canada/Latin America Support Services Call Center Toll-free Direct dial Africa/Middle East Support ServicesAsia/Pacific Support Services Cheetah 10K.6 FC Product Manual, Rev. B Index FC-AL Cheetah 10K.6 FC Product Manual, Rev. B Plogi Cheetah 10K.6 FC Product Manual, Rev. B Cheetah 10K.6 FC Product Manual, Rev. B
Related manuals
Manual 2 pages 5.2 Kb

ST336607FC, ST373307FC, ST3146807FC specifications

The Seagate ST373307FC, ST3146807FC, and ST336607FC are robust hard disk drives designed for enterprise environments where reliability and performance are critical. Each model offers distinct features suited to various data storage needs, reflecting Seagate's commitment to innovation in storage technology.

The ST373307FC is a 73GB Fibre Channel hard drive that operates at 15,000 RPM, making it exceptionally fast for read and write operations. This drive employs a 4GB cache, enhancing its performance by allowing quicker access to frequently used data. With a 3.5-inch form factor, the ST373307FC is built for high-density environments, delivering reliable access to data. Its Fibre Channel interface supports high-speed connections, essential for data-intensive applications like databases and virtualization.

Next in line, the ST3146807FC offers a capacity of 146GB, also operating at 15,000 RPM. This drive features an 8GB cache, which significantly improves its data transfer rates, making it ideal for transactional workloads. The ST3146807FC is engineered to minimize latency and maximize throughput, ensuring that enterprises can access critical data swiftly and efficiently. Additionally, its rugged construction is designed to withstand the demands of continuous operation, providing peace of mind for businesses with strict uptime requirements.

Lastly, the ST336607FC has a substantial storage capacity of 300GB and shares the 15,000 RPM operational speed that characterizes this high-performance line. With a similar 8GB cache as the ST3146807FC, it offers excellent performance for read-intensive and write-heavy applications. The ST336607FC is also designed with enhanced thermal management features, supporting cooler operations in densely packed server environments. This model is particularly suited for applications such as data warehousing and online transaction processing, where speed and reliability are paramount.

Each of these drives utilizes advanced technologies like Native Command Queuing (NCQ), which optimizes the order of read and write requests. These features, combined with Seagate's reputation for durability and performance, make the ST373307FC, ST3146807FC, and ST336607FC excellent choices for enterprise applications requiring high-speed data access and exceptional reliability. In environments where data integrity and uptime are critical, these drives provide the robust performance necessary to meet demanding storage needs.
Top Page Image Contents