Quantum LTO-3 manual Theory Data Compression

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Chapter 4 Theory

Data Compression

Software data compression should never be used because the LTO-3 Tape Drive's built-in intelligent data compression is much more efficient than software data compression systems.

The LTO-3 Tape Drive uses a derivative of ALDC-2 lossless data compression that includes additional control codes for intelligent data compression.

38	LTO-3 Tape Drive User’s Guide

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Contents 72 Copyright Statement Contents Chapter Operation Chapter Specifications Chapter Troubleshooting Guide Figures Figures Viii Tables Tables Audience PrefacePurpose Organization DocumentNotational Conventions SCSI-2 Specification RelatedDocuments ContactsQuantum Home Technical PublicationsCustomer Support 1Overview, Unpacking Instructions and Quick Start OverviewDrive Configurations FeaturesUnpacking and Inspection Quick Start Guide Internal LTO-3Tape Drive Quick StartInternal Tape Drive Guidelines and Cautions Desktop LTO-3LTO-3 Tape Drive User’s Guide 2Installation Drive Installation InstructionsConfiguring an Installing an Internal LTO-3 Tape DriveLVD Drive Jumper Settings JumpersTerminator Power Mounting Internal LTO-3 Tape Drive Acceptable Mounting OrientationsADI Fixed Board Connector Internal LTO-3 Tape Drive Mounting DimensionsConnector ADI Free CableADI Free Cable Connector Rear View of the Internal LTO-3 Tape drive Connecting a Serial Cable for Tape Libraries Pin Number DescriptionConnection Name Type Driven By Connection Definition Installing a Desktop LTO-3 Tape Drive Connecting a Power Cable Installing the LTO DriverInstallation Installing a Desktop LTO-3 Tape Drive Scsi Termination Examples for the Desktop LTO-3 Tape Drive Commercial backup application software Installation Installing a Desktop LTO-3 Tape Drive 3Operation Understanding the Front Panel Display Shows a view of the LTO-3 front-panel displayBlink Codes EOTUsing LTO Cartridges Loading a Cartridge Unloading a CartridgeWrite-protecting a Cartridge Maintenance Drive MaintenanceCartridge Care Operation Drive Maintenance Using the Load/ Unload Button to Park the Drive Parking the Drive for Shipping4Theory Track LayoutShows the layout of data on an LTO tape Data Buffer Recording MethodData Integrity C1 ECC Data Compression FaultsServo-tracking Data Compression Considerations Intelligent Data CompressionTheory Data Compression 5Specifications Physical Specifications Shows the dimensions of the internal LTO-3 Tape Drive Power Specifications Specification +12 VDC + 5VDCDrive Performance Specifications Specification ValueSpecification Operational Non-operational Environmental RequirementsReliability Injected NoiseSpecification Description Mean Time Between FailuresLTO Cartridge Specifications Mean Time toReplace EnvironmentalRegulatory Compliance ReliabilityCountry Regulatory Organization Compliant to IeceePREDOM-OBR Disposal of Electrical and Electronic Equipment LTO-3 Tape Drive User’s Guide 6UNIX Settings Configuring for the DEC/Compaq Unix Environment Word About Scsi ControllersFinding Current TargetsConfiguring TypesControllers Device File st.confLTO-3 Tape Drive User’s Guide Using Smit Configuring LTO-3 Tape DrivesFinding Existing Configuring for SCO Open Server This command produces output similar toConfiguring the LTO-3 Tape Drive with mkdev Configuring for Linux Finding Existing Scsi Controllers DevicesYou may see output similar to Configuring for SGI Irix For Irix 6.4/6.5Configuration Configuring for HP-UXHardware/Driver Unix Settings Configuring for HP-UX Unix Settings Configuring for HP-UX 7Troubleshooting Guide Installation Best PracticesDo Not Troubleshooting Suggestions Internal tape drive Desktop tape driveWindows Operating System Problems with Tape Drive and Cartridge Red Hat Linux Tape will not Load into Tape DriveTroubleshooting Guide Troubleshooting Suggestions Tape will not Eject from the Drive Backup Failures OVERWRITTEN. ALL Previously Written Data on the Tape will Tape is Write Protected Miscellaneous TapeAlert MessagesLTO-3 Tape Drive User’s Guide Slow Backups Troubleshooting Guide Troubleshooting Suggestions Index Intelligent 37 Data integrity Scsi ID Tape drive not recognized by operating system or application