Reliability Specifications, Service Life | Exabyte EXB-8505 8mm

6 Functional Specifications

Reliability Specifications

This section lists the reliability specifications for the tape drive.

Service Life

The tape drive has been designed to exceed a useful service life of five years, during which time all performance and reliability specifications are applicable.

Machine Reliability: Mean Time Between Failures (MTBF)

The mean time between failures (MTBF) value for the EXB-8205,

EXB-8205XL, EXB-8505, and EXB-8505XL is 160,000 power-on hours.

The MTBF value for the tape drive is defined as follows:

Total Power-on Hours

MTBF =

Number of Relevant Equipment Failures

where:

Total Power-on Hours is the total time the tape drive is drawing current from the input power supply system.

Relevant Equipment Failures are those failures that cannot be corrected by the operating personnel and require the intervention of maintenance personnel.

May 1994	EXB-8205 and EXB-8505	6-7
	(Standard and XL)

Image 99

Exabyte EXB-8505 8mm manual Reliability Specifications, Service Life, Machine Reliability Mean Time Between Failures Mtbf

Contents

3URGXFW 6SHFLILFDWLRQ Revision History CopyrightDisclaimer Trademark Notices May Changes and Enhancements to This Manual Product Warranty Caution Contents Functional Description Requirements for Use Glossary Index Safety and Regulatory Agency Compliance Features Recording FormatFunctional Description Functional Specifications Tables Interface Specifications About This Manual Intended AudienceHow This Manual is Organized Related Publications EXB-8205 and EXB-8505 8mm Cartridge Tape SubsystemsLibraries and Enclosures Standards Conventions Used in This Specification Xiv Features Features Features 1Comparison of the four tape drives Features 1Comparison of tape drive features Read/Write Compatibility with Other Tape DrivesSupported Formats Data format features Determining the Tape Format Data Compression Custom Eeprom Options Storage Capacity Length Approximate Capacity to Leot a in MBytes8500c Format 8200c Compressed Format b EXB-8505 EXB-8505XL Front Panel Controls and Indicators Physical DescriptionDoor and Bezel Unload Button LEDsLabels Ground Tab and Grounding Hole Scsi ConnectorPower Connector Back Panel Components Resistor Terminators single-ended configuration only Scsi ID Jumper BlockMonitor Port 5Internal components EXB-8505 shown Internal Components of the Tape Drive Tape Transport Mechanism Rotating Drum Assembly Servo Card SSV Lower Digital SLD Card Preamp and Upper Analog Cards 7External dimensions in inches and millimeters Size and Weight Related Products Integration with Other Exabyte ProductsEXB-210 8mm Library Mini Tabletop Cartridge Tape Subsystem 9Mini Tabletop CTSs with EXB-8505s installed Exatapeô Data Cartridges Features 5EXATAPE media compatibility with 8mm tape drives Exabyte Cleaning Cartridges Recording Format Recording Format Helical-Scan Recording Physical Track Structure Physical Format 510504 3Physical track structure for 8500 and 8500c format 8500/8500c Physical Track Structure 8200c and 8200 Physical Track Structure 5Physical track structure for 8200c track format 510504 Physical Blocks Servo Areas Search Fields 1Recording parameters Recording Parameters Supported Logical Formats Logical Format Logical Blocks Logical Block CompressionLogical Block Packing 9Logical block packing one physical block 10Gap bytes one physical block Gap Bytes 11One gap block and one gap track in two physical tracks Gap Blocks and Gap Tracks Filemarks Long Filemarks2Type and size of filemarks for each format Setmarks EXB-8505 and EXB-8505XL only End of Data EODShort Filemarks Track and Block Counts Hex Decimal 4Track and physical block counts for 8500 and 8500c formatsLbot to Leot Leot to Peot Number of tracks Number of blocks Functional Description Write Operations Data Flow and Data CompressionFunctional Description Logical Block CRC Data Compression Monitoring Streaming and Start/Stop Modes Thresholds During a Write Operation Motion ThresholdReconnect Threshold Read-After-Write Checking Error Detection, Correction, and Recovery ProceduresError Correction Code ECC Cyclic Redundancy Check CRC 2Data flow during a read operation Read Operations Thresholds During a Read Operation Requirements for Use Installation Requirements Requirements for Setting the Scsi IDRequirements for Use Requirements for Mounting the Tape Drive 2Mounting holes on the sides 4Mounting hole dimensions in inches and millimeters Terminators for Single-Ended Configuration Terminators for Differential ConfigurationRequirements for Scsi Bus Termination Requirements for Connecting a Scsi Cable ImpedanceCable Length Primary Conductor Scsi Cable Connector Requirements Signal Pin Number 1Connector pin assignments for differential tape drives Ground Termpwr Device States Power-On ModeOperation Tape Drive Controls 6LEDs on the faceplate of the EXB-8505 and EXB-8505XL LED states during operation LKey for m3 Loading Data Cartridges Load Time Unloading Data Cartridges Resetting the Tape Drive Effect of PREVENT/ALLOW Medium Removal CommandError During Unload Procedure Preventive Maintenance Using Scsi CommandsCleaning the Tape Drive Loading New Microcode Determining When the Tape Drive Needs CleaningTime-to-Clean LED Indication Request Sense 03h Command Shipping Cartons 4Single pack and multi-pack shipping dimensions and weightsSize Dimensions Weight Shipping Requirements Unpacking and Packing Instructions Interface Specifications Data Transfer Rate Scsi FeaturesInterface Specifications Physical Path Initiator to Scsi Messages1SCSI messages Hex Value Description Out Scsi Commands 2SCSI-2 command setCommand OP Code Description Receive Diagnostic Erasing Data Using Scsi CommandsWriting Data Reading Data Searching for Data Copying MicrocodeInquiring About Tape Drive Status LOG Sense 4Dh and LOG Select 4Ch Commands Performing Diagnostic TestsSetting Operating Parameters Inquiry 12h Command Functional Specifications 1Typical write and read access times Performance SpecificationsWrite and Read Access Times Functional Specifications EXB-8205 and EXB-8205XL EXB-8505 and EXB-8505XL Tape SpeedFile-Search Tape Speed 3File-search tape speeds Size Length Typical rewind time Exatape a Seconds Reposition TimeRewind Tape Speed 4Typical rewind times Drum Rotation Period Tape Tension Release and Drum Motion Suspension5Drum rotation periods Transfer 8500c a 8500 a 8200c Reselection Phase TimeoutData transfer rates Type Reliability Specifications Service LifeMachine Reliability Mean Time Between Failures Mtbf Conditions for the Mtbf Value Test Conditions Restrictions for the Mtbf Value Data Integrity Data Reliability Conditions for Data ReliabilityRestrictions for Data Reliability Read Reliability Write Reliability Power Specifications 7Power specifications for standard voltagesVoltages Power Connector 8Power connector pin assignmentsPin Number Assignment 2Chassis ground location on back panel Grounding Hole and Ground Tab 9Environmental specifications Environmental Specifications 10Temperature and humidity specifications Point Temperature HumidityOperating Environment Air Flow Requirements Particulate Contamination Limits11Particle contamination limits 12Shock specifications Shock Specifications Random vibrationb applied during non-operationcand storaged Vibration Specifications13Vibration specifications Random vibrationa applied during operation Operating mode Acoustic Noise14Acoustic noise limits Safety and Regulatory Agency Compliance Safety Agency Standards Safety and Regulatory Agency ComplianceElectrostatic Discharge ESD Radiated Susceptibility Electromagnetic Compatibility EMC 510504 Glossary Glossary May Signal Driving a signal to the true state. assertion Index Mtbf Index Scsi 510504