Support for additional LUN

Since LTO 4 drives cannot write to Ultrium-2 media, the WRTOK bit will be clear for this media type.

Enabling additional LUN support

When enabled by an internally-connected autochanger device, an extra Logical Unit Number (LUN) will be available at the target’s SCSI ID. This allows the attached autochanger device to be addressed via the tape drive. See ”Automation interface” on page 35. For ADI Bridging usage, the automation LUN will usually be LUN1.

No other LUNs are available on the drive, although HP is looking to provide new functionality through the use of additional LUNs in future products.

Supporting additional LUNs

When working with a library vendor who is incorporating HP Ultrium drives in products, software developers should liaise directly with the vendor about the functionality of the hardware available through the ADI or ACI.

HP LTO Ultrium 4 drives technical reference manual, volume 2: software integration 17 HP restricted

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HP LTO 4 SAS, LTO 4 FC, LTO 4 SCSI Support for additional LUN, Enabling additional LUN support, Supporting additional LUNs

Contents

LTO 4 FC, SCSI and SAS drives volume 2 software integrationHP LTO Ultrium tape drives technical reference manual HP restricted Legal and notice information 1 Designing backup applications Contents2 Configuration and initialization 3 Use of tapes 4 Factors affecting performance 5 Supporting Ultrium features 7 Exception handling 6 Sense keys and codes HP restricted Documentation map Related documentsDocuments specific to HP Ultrium drives Drives-general Operation Installation and configurationCartridges Interface Dealing with errors Maintenance and troubleshooting General documents and standardization LTO Ultrium features Non-immediate commands 1 Designing backup applicationsOptimizing performance Large data transfer size Managing the use of tapes Cleaning tape headsInformation in Cartridge Memory Monitoring tape use Diagnostic logs Design goals for LTO backup applicationsTapeAlert Displaying drive information Include the capability to download firmware Operating system drivers 2 Configuration and initializationInquiry string recovery SCSI protocol, regardless of transport or interface type Example16 Configuration and initialization Supporting additional LUNs Support for additional LUNEnabling additional LUN support 18 Configuration and initialization Using MODE SENSE Using Cartridge Memory attributes3 Use of tapes LTO cartridge memory Interpreting Log Sense data Tape status and capacityFinding the remaining capacity CDB fields Using the SET CAPACITY commandCommand descriptor block WORM media Changes to SCSI commandsHow WORM media works New additional sense codes and TapeAlert flags ERASE commands rejected Error Usage pageSET CAPACITY command Re-writing media labels Unique media identifier Using CM to check tape integrityBehavior with a missing or inconsistent EOD value Barcode support Responding to Cartridge Memory dataLoad count Corrective action RWW retry counts Ways of optimizing performance 4 Factors affecting performanceDetecting the drive’s speed Ensuring the recommended minimum transfer sizes Using the Performance Log page for diagnosing problems Using Cartridge Memory instead of tape headersTime-out values Media type identification Host-related factors Recommended support of log pagesFactors affecting performance Recommendation Examplewhere possible or a reasonably sized RAID system. More disks means makes sense to split heavily used FC cards across separate PCI busses Do not interleave write commands with other commands, such as READ Drive-related factors Format-related factors Page 34 Factors affecting performance Cartridge Memory LTO-CM 5 Supporting Ultrium featuresAutomation interface Further information Automation/Device Interface ADI Slave to a library controller Automation Control Interface ACIModes of usage through ACI SCSI pass-through mode ACI command setACI commands that affect drive streaming performance Backward compatibility New features in ACI SCSI command Encryption support Supporting the ACI protocol Further detailsRecommended ACI time-out values 42 Supporting Ultrium features Treatment of reserved fields Recommended power-up sequence Recommended load-unload configuration Recommended Get Drive Status polling frequency Firmware upgrade via tapeACI protocol communications retry Upgrading the drive firmware Firmware upgrade via ACI Firmware upgrade via the primary host interfaceLibrary firmware upgrade via tape Handling irregular cartridges Expired cleaning cartridge HP-configured or Universal Cleaning cartridge HP-configured or UniversalNon-HP Ultrium 1 cleaning cartridge Unreadable data cartridge Data cartridge with unreadable CM Valid firmware upgrade cartridgeCartridge fails to seat or load Cartridge cannot be loaded Cleaning Frequently asked questionsInvalid firmware upgrade cartridge Is there separate firmware for drives intended to go into libraries? Resetting drives Backup softwareResetting via the ACI Reset command Resetting using the ACIRSTL line Controlling data compression Accessing Cartridge Memory without threading the tapeOther mode page information Buffer size at EW-EOM Write delay time Rewind on resetPartition size 52 Supporting Ultrium features Sense keys-actions to take 6 Sense keys and codesAction Console Message For additional sense codes, see “3h-MEDIUM ERROR” on “3h-MEDIUM ERROR” on page 62 . Also see the Media Accesslog the error, terminate I/O to the drive, and pass the appropriate error to the calling application Console Message ActionAction Console Message Action Physical Additional sense codes-actions to takeEnd-of-Tape reached, unable to fit 0h-NO SENSE 2h-NOT READY 1h-RECOVERED ERROR LUN not accessible, port in The software must issue a LOAD before media accessThe command cannot be executed because the specified 60 Sense keys and codes mechanism tests are being executed. When the tests are 62 Sense keys and codes 3h-MEDIUM ERRORA READ , SPACE , WRITE or WRITE FILEMARKS command and the drive. Based on this, ask the user to clean the Send a console message that an unrecovered error on 64 Sense keys and codes Send a message to the console indicating that there is 66 Sense keys and codes The current command such as READ, SPACE, REWIND 4h-HW ERROR 68 Sense keys and codes 5h-ILLEGAL REQUESTA MODE SELECT parameter list sent to the drive contains persistent reservation using the PERSISTENT RESERVE OUT 6h-UNIT ATTENTIONallowed to execute. In other words, some commands can 32 initiators to register, using PERSISTENT RESERVE OUT Action A PERSISTENT RESERVE OUT command was executed service action removed all reservations and the persistentWRITE BUFFER or MAINTENANCE OUT command A SET DEVICE IDENTIFIER command has been successful 7h-DATA PROTECTION Action 8h-BLANK CHECK related to a missing EOD data set. The most likely cause Bh-ABORTED COMMANDREAD BUFFER command 76 Sense keys and codes Dh-VOLUME OVERFLOWA WRITE or WRITE FILEMARKS command has encountered 1. Retrieve fault information Typical escalation procedure3. Allow the user to try recovery 4. Allow the user to reset devices Supporting TapeAlert Monitoring the condition of the drive and media Type FlagsPage Page Page Page Page Page Page TapeAlert models Designing software to use the TapeAlert log TapeAlert informational exception usage model Reading the TapeAlert logTapeAlert polling usage model Supporting OBDR One-Button Disaster Recovery OBDRResponding to the ‘Clean’ LED Requirements for drivers and logical device managers Providing pass-through mode Glossary see ”read-while-write” Index Page Page HP restricted