HP Tape manual Glossary

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UNIX glossary

data protection

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SCSI configuration

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glossary

This topic is available in English only.

AT&T mode

Berkeley and AT&T functional modes differ in "read only" close functionality. In AT&T mode, a device close operation will cause the tape to be repositioned just after next tape filemark (the start of the next file).

Berkeley mode

Berkeley and AT&T functional modes differ in "read only" close functionality. In Berkeley mode the tape position will remain unchanged by a device close operation.

Compression

A procedure in which data is transformed by the removal of redundant information to reduce the number of bits required to represent the data. This is done by substituting short codewords for strings of bytes.

Filemark

A mark written by the host to the tape, which can be searched for, often using the drive's fast-search capability. It does not necessarily separate files. It is up to the host to assign a meaning to the mark.

Immediate mode

A mode of responding to SCSI commands where the drive or other peripheral does not wait until the command has finished before returning status information back to the host. When writing filemarks, Immediate mode can significantly improve the performance of systems which do not set the Immediate bit when sending a SCSI WRITE FILEMARKS command. On the other hand, data is not flushed to tape in response to a filemark command.

Infinite flush

By default, the buffer in the drive is flushed every 5 seconds. Infinite flush avoids frequent starting and stopping of the mechanism when using a very slow application. It also avoids losing capacity through the flushing of partly written groups. On the other hand, infinite flush means that data can remain in the buffer for very long periods of time, and could be lost in the event of a power failure.

LUN

Logical Unit Number. A unique number by which a device is identified on the SCSI bus. A tape drive has a fixed LUN of 0. In an autoloader, the changer mechanism is LUN1.

© 2000, Hewlett-Packard Company

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Contents Date CopyrightRevision history OctoberObtaining technical support North and south america Europe, middle east and africa Asia pacific Warranty WarrantyWarranty conditions ExclusionsCustomer service form Before you start Resetting the drive Switching on the driveIf you have problems during self test OperationWrite Protected first light Front panel lightsFront panel lights Ready second lightTo unload a cartridge Loading and unloadingTo load a cartridge To label a cartridgeCartridge care Cleaning cartridge CleaningCleaning strategy Cleaning the tape heads on a driveFeatures and specifications Choose your model from the bulleted list belowHp surestore dlt1i Hp surestore dlt1e Non-operating limits storage rangesDlt1e Action Drive Media compatibilityDLT1 compatibility matrix DLT4000 DLT7000Diagnostics Troubleshooting Frequently asked questions FAQsScsi configuration This topic is available in English only ModelCreating the device files HP-UX systems series 700 onlyDetermining the Scsi id ExampleConfiguring for Digital Unix DEC systems, Digital UnixIBM RS/600 systems, AIX Configuring the device filesScsi configuration Unix configuration hp systems Device file names under AIXPC-based UNIX, SCO and Linux Silicon Graphics systems, Irix Mtcan and constants valuesFor all adapters Sun systems, Solaris 2 SunOSHp-data values Value MeaningOverview Verify the installationVerifying the installation System-specific argumentsGlossary Rail kits Ordering suppliesAdapters MediaOrdering supplies DLT1 Secure the drive Scsi ID Mounting bay Scsi host bus adapterScsi ribbon cable Mounting hardwareBackup software User documentation HP product registrationDrivers HP Library & Tape ToolsChecking the drive’s Scsi ID Page Preparing mounting bay in a Page Attaching tray for NetServer L-Series servers Page Installing the drive Page Attaching Scsi and power cables to internal drive Page Securing the drive side mounting screws shown Page Tape drive controls and indicators Front panel LEDs ReadyWrite protecting cartridges Cleaning cartridges Write-protecting cartridgesLooking after cartridges Loading a cartridge Check operation To load a cartridgeTo unload a cartridge Using HP Library & Tape Tools Page If you have Internet access, register electronically If you do not have internet accessNone of the drive’s LEDs illuminate Other sources of information Page External tape drive Check the drive’s Scsi ID Connect the power cableTroubleshooting Connect the Scsi cableScsi ID Scsi cable Backup software HP product registration Checking the Scsi ID Page Connecting the Scsi cable Page Connecting the power cable Page Tape drive front panel Front panel LEDs Write-protecting cartridges Write-protecting cartridges Loading a DLTtape cartridge Check operation Using HP Library & Tape Tools Page If you have internet access, register electronically None of the drive’s LEDs illuminate All of the LEDs on the front panel blink continuallyIs properly terminated