Controlling data compression, Buffer size at EW-EOM

Image 51

HP LTO 4 FC manual Controlling data compression, Other mode page information, Buffer size at EW-EOM, Synchronize at EW-EOM

Contents

HP restricted volume 2 software integrationLTO 4 FC, SCSI and SAS drives HP LTO Ultrium tape drives technical reference manual Legal and notice information 3 Use of tapes Contents1 Designing backup applications 2 Configuration and initialization 4 Factors affecting performance 5 Supporting Ultrium features 7 Exception handling 6 Sense keys and codes HP restricted Drives-general Related documentsDocumentation map Documents specific to HP Ultrium drives Interface Installation and configurationOperation Cartridges Dealing with errors Maintenance and troubleshooting General documents and standardization LTO Ultrium features Large data transfer size 1 Designing backup applicationsNon-immediate commands Optimizing performance Monitoring tape use Cleaning tape headsManaging the use of tapes Information in Cartridge Memory Displaying drive information Design goals for LTO backup applicationsDiagnostic logs TapeAlert Include the capability to download firmware 2 Configuration and initialization Inquiry string recoveryOperating system drivers Example 16 Configuration and initializationSCSI protocol, regardless of transport or interface type Support for additional LUN Enabling additional LUN supportSupporting additional LUNs 18 Configuration and initialization LTO cartridge memory Using Cartridge Memory attributesUsing MODE SENSE 3 Use of tapes Tape status and capacity Finding the remaining capacityInterpreting Log Sense data Using the SET CAPACITY command Command descriptor blockCDB fields New additional sense codes and TapeAlert flags Changes to SCSI commandsWORM media How WORM media works Re-writing media labels Error Usage pageERASE commands rejected SET CAPACITY command Using CM to check tape integrity Behavior with a missing or inconsistent EOD valueUnique media identifier Responding to Cartridge Memory data Load countBarcode support Corrective action RWW retry counts Ensuring the recommended minimum transfer sizes 4 Factors affecting performanceWays of optimizing performance Detecting the drive’s speed Media type identification Using Cartridge Memory instead of tape headersUsing the Performance Log page for diagnosing problems Time-out values Recommended support of log pages Factors affecting performanceHost-related factors makes sense to split heavily used FC cards across separate PCI busses ExampleRecommendation where possible or a reasonably sized RAID system. More disks means Do not interleave write commands with other commands, such as READ Drive-related factors Format-related factors Page 34 Factors affecting performance Further information 5 Supporting Ultrium featuresCartridge Memory LTO-CM Automation interface Automation/Device Interface ADI Automation Control Interface ACI Modes of usage through ACISlave to a library controller ACI command set ACI commands that affect drive streaming performanceSCSI pass-through mode Backward compatibility New features in ACI SCSI command Encryption support 42 Supporting Ultrium features Further detailsSupporting the ACI protocol Recommended ACI time-out values Treatment of reserved fields Recommended power-up sequence Recommended load-unload configuration Upgrading the drive firmware Firmware upgrade via tapeRecommended Get Drive Status polling frequency ACI protocol communications retry Handling irregular cartridges Firmware upgrade via the primary host interfaceFirmware upgrade via ACI Library firmware upgrade via tape Unreadable data cartridge Cleaning cartridge HP-configured or UniversalExpired cleaning cartridge HP-configured or Universal Non-HP Ultrium 1 cleaning cartridge Cartridge cannot be loaded Valid firmware upgrade cartridgeData cartridge with unreadable CM Cartridge fails to seat or load Is there separate firmware for drives intended to go into libraries? Frequently asked questionsCleaning Invalid firmware upgrade cartridge Resetting using the ACIRSTL line Backup softwareResetting drives Resetting via the ACI Reset command Buffer size at EW-EOM Accessing Cartridge Memory without threading the tapeControlling data compression Other mode page information 52 Supporting Ultrium features Rewind on resetWrite delay time Partition size Console Message 6 Sense keys and codesSense keys-actions to take Action error to the calling application “3h-MEDIUM ERROR” on page 62 . Also see the Media AccessFor additional sense codes, see “3h-MEDIUM ERROR” on log the error, terminate I/O to the drive, and pass the appropriate Console Message ActionConsole Message Action page reached, unable to fit Additional sense codes-actions to takePhysical End-of-Tape 0h-NO SENSE 2h-NOT READY 1h-RECOVERED ERROR 60 Sense keys and codes The software must issue a LOAD before media accessLUN not accessible, port in The command cannot be executed because the specified mechanism tests are being executed. When the tests are 3h-MEDIUM ERROR A READ , SPACE , WRITE or WRITE FILEMARKS command62 Sense keys and codes 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 5h-ILLEGAL REQUEST A MODE SELECT parameter list sent to the drive contains68 Sense keys and codes 32 initiators to register, using PERSISTENT RESERVE OUT 6h-UNIT ATTENTIONpersistent reservation using the PERSISTENT RESERVE OUT allowed to execute. In other words, some commands can Action A SET DEVICE IDENTIFIER command has been successful service action removed all reservations and the persistentA PERSISTENT RESERVE OUT command was executed WRITE BUFFER or MAINTENANCE OUT command 7h-DATA PROTECTION Action 8h-BLANK CHECK Bh-ABORTED COMMAND READ BUFFER commandrelated to a missing EOD data set. The most likely cause Dh-VOLUME OVERFLOW A WRITE or WRITE FILEMARKS command has encountered76 Sense keys and codes 4. Allow the user to reset devices Typical escalation procedure1. Retrieve fault information 3. Allow the user to try recovery 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 Reading the TapeAlert log TapeAlert polling usage modelTapeAlert informational exception usage model One-Button Disaster Recovery OBDR Responding to the ‘Clean’ LEDSupporting OBDR Requirements for drivers and logical device managers Providing pass-through mode Glossary see ”read-while-write” Index Page Page HP restricted

HP LTO 4 FC Controlling data compression, Other mode page information, Buffer size at EW-EOM

Models: LTO 4 SCSI