Factors affecting performance | HP LTO 4 SCSI, LTO 4 FC, LTO 4 SAS

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HP LTO 4 SCSI, LTO 4 FC, LTO 4 SAS manual Factors affecting performance, Supporting Ultrium features

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volume 2 software integration LTO 4 FC, SCSI and SAS drivesHP LTO Ultrium tape drives technical reference manual HP restricted Legal and notice information Contents 1 Designing backup applications2 Configuration and initialization 3 Use of tapes 5 Supporting Ultrium features 4 Factors affecting performance 6 Sense keys and codes 7 Exception handling HP restricted Related documents Documentation mapDocuments specific to HP Ultrium drives Drives-general Installation and configuration OperationCartridges Interface Maintenance and troubleshooting Dealing with errors LTO Ultrium features General documents and standardization 1 Designing backup applications Non-immediate commandsOptimizing performance Large data transfer size Cleaning tape heads Managing the use of tapesInformation in Cartridge Memory Monitoring tape use Design goals for LTO backup applications Diagnostic logsTapeAlert Displaying drive information Include the capability to download firmware Inquiry string recovery 2 Configuration and initializationOperating system drivers 16 Configuration and initialization ExampleSCSI protocol, regardless of transport or interface type Enabling additional LUN support Support for additional LUNSupporting additional LUNs 18 Configuration and initialization Using Cartridge Memory attributes Using MODE SENSE3 Use of tapes LTO cartridge memory Finding the remaining capacity Tape status and capacityInterpreting Log Sense data Command descriptor block Using the SET CAPACITY commandCDB fields Changes to SCSI commands WORM mediaHow WORM media works New additional sense codes and TapeAlert flags Error Usage page ERASE commands rejectedSET CAPACITY command Re-writing media labels Behavior with a missing or inconsistent EOD value Using CM to check tape integrityUnique media identifier Load count Responding to Cartridge Memory dataBarcode support RWW retry counts Corrective action 4 Factors affecting performance Ways of optimizing performanceDetecting the drive’s speed Ensuring the recommended minimum transfer sizes Using Cartridge Memory instead of tape headers Using the Performance Log page for diagnosing problemsTime-out values Media type identification Factors affecting performance Recommended support of log pagesHost-related factors Example Recommendationwhere possible or a reasonably sized RAID system. More disks means makes sense to split heavily used FC cards across separate PCI busses Drive-related factors Do not interleave write commands with other commands, such as READ Format-related factors Page 34 Factors affecting performance 5 Supporting Ultrium features Cartridge Memory LTO-CMAutomation interface Further information Automation/Device Interface ADI Modes of usage through ACI Automation Control Interface ACISlave to a library controller ACI commands that affect drive streaming performance ACI command setSCSI pass-through mode New features in ACI Backward compatibility SCSI command Encryption support Further details Supporting the ACI protocolRecommended ACI time-out values 42 Supporting Ultrium features Recommended power-up sequence Treatment of reserved fields Recommended load-unload configuration Firmware upgrade via tape Recommended Get Drive Status polling frequencyACI protocol communications retry Upgrading the drive firmware Firmware upgrade via the primary host interface Firmware upgrade via ACILibrary firmware upgrade via tape Handling irregular cartridges Cleaning cartridge HP-configured or Universal Expired cleaning cartridge HP-configured or UniversalNon-HP Ultrium 1 cleaning cartridge Unreadable data cartridge Valid firmware upgrade cartridge Data cartridge with unreadable CMCartridge fails to seat or load Cartridge cannot be loaded Frequently asked questions CleaningInvalid firmware upgrade cartridge Is there separate firmware for drives intended to go into libraries? Backup software Resetting drivesResetting via the ACI Reset command Resetting using the ACIRSTL line Accessing Cartridge Memory without threading the tape Controlling data compressionOther mode page information Buffer size at EW-EOM Rewind on reset Write delay timePartition size 52 Supporting Ultrium features 6 Sense keys and codes Sense keys-actions to takeAction Console Message “3h-MEDIUM ERROR” on page 62 . Also see the Media Access For additional sense codes, see “3h-MEDIUM ERROR” onlog the error, terminate I/O to the drive, and pass the appropriate error to the calling application Action Console MessageAction Console Message page Additional sense codes-actions to take PhysicalEnd-of-Tape reached, unable to fit 0h-NO SENSE 1h-RECOVERED ERROR 2h-NOT READY The software must issue a LOAD before media access LUN not accessible, port inThe command cannot be executed because the specified 60 Sense keys and codes mechanism tests are being executed. When the tests are A READ , SPACE , WRITE or WRITE FILEMARKS command 3h-MEDIUM ERROR62 Sense keys and codes Send a console message that an unrecovered error on and the drive. Based on this, ask the user to clean the 64 Sense keys and codes Send a message to the console indicating that there is The current command such as READ, SPACE, REWIND 66 Sense keys and codes 4h-HW ERROR A MODE SELECT parameter list sent to the drive contains 5h-ILLEGAL REQUEST68 Sense keys and codes 6h-UNIT ATTENTION persistent reservation using the PERSISTENT RESERVE OUTallowed to execute. In other words, some commands can 32 initiators to register, using PERSISTENT RESERVE OUT Action service action removed all reservations and the persistent A PERSISTENT RESERVE OUT command was executedWRITE BUFFER or MAINTENANCE OUT command A SET DEVICE IDENTIFIER command has been successful 7h-DATA PROTECTION Code 8h-BLANK CHECK READ BUFFER command Bh-ABORTED COMMANDrelated to a missing EOD data set. The most likely cause A WRITE or WRITE FILEMARKS command has encountered Dh-VOLUME OVERFLOW76 Sense keys and codes Typical escalation procedure 1. Retrieve fault information3. Allow the user to try recovery 4. Allow the user to reset devices Monitoring the condition of the drive and media Supporting TapeAlert Flags TypePage Page Page Page Page Page Page Designing software to use the TapeAlert log TapeAlert models TapeAlert polling usage model Reading the TapeAlert logTapeAlert informational exception usage model Responding to the ‘Clean’ LED One-Button Disaster Recovery OBDRSupporting OBDR Providing pass-through mode Requirements for drivers and logical device managers Glossary see ”read-while-write” Index Page Page HP restricted