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Quantum LTO-8 HH SAS, Техническое справочное руководство

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Contents

v

QuantumLTO-8 HH SAS User’s Guide

Updating firmware  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Updating Firmware through the Host Interface  . . . . . . . . . . . 30
Updating the firmware with an FUP tape cartridge  . . . . . . . . 30

Chapter 4

Operations

33

Operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Power Button  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Single-character Display (SCD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

SCD Dot  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Status Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Unload Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Inserting a Tape Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Removing a Tape Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Mid-tape Recovery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Cleaning the Drive Head  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Cleaning the Tape Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Diagnostic and Maintenance Functions. . . . . . . . . . . . . . . . . . . . . . . . 45

Entering Maintenance Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 48
Exiting Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Function Code 0: Maintenance Mode . . . . . . . . . . . . . . . . . . . 49
Function Code 1: Run Drive Diagnostics . . . . . . . . . . . . . . . . . 49
Function Code 2: Update Drive Firmware from FUP Tape . . . . 50

Function Code 3: Create FUP Tape  . . . . . . . . . . . . . . . . . . . . . 51
Function Code 4: Force a Drive Dump. . . . . . . . . . . . . . . . . . . 52
Function Code 5: Copy Drive Dump  . . . . . . . . . . . . . . . . . . . . 52

Function Code 6: Run Host Interface Wrap Test . . . . . . . . . . . 54
Function Code 7: Run RS-422 Wrap Test. . . . . . . . . . . . . . . . . 55
Function Code 8: Unmake FUP Tape . . . . . . . . . . . . . . . . . . . . 56

Function Code 9: Display Error Code Log  . . . . . . . . . . . . . . . . 57
Function Code A: Clear Error Code Log . . . . . . . . . . . . . . . . . . 57
Function Code C: Insert Cartridge into Tape Drive  . . . . . . . . . 58

Function Code E: Test Cartridge & Media . . . . . . . . . . . . . . . . 58
Function Code F: Write Performance Test . . . . . . . . . . . . . . . . 59
Function Code H: Test Head . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Function Code J: Fast Read/Write Test. . . . . . . . . . . . . . . . . . . 61
Function Code L: Load/Unload Test. . . . . . . . . . . . . . . . . . . . . 63

Содержание LTO-8 HH SAS

Страница 1: ...Technical Reference Manual Quantum LTO 8 HH SAS User s Guide 6 68132 03 Rev A...

Страница 2: ...um Corporation is prohibited by law and constitutes a punishable violation of the law TRADEMARK STATEMENT Quantum the Quantum logo DLT DLTtape the DLTtape logo SuperLoader Scalar StorNext and DXi are...

Страница 3: ...g the Safety Inspection Procedure 3 Tape drive AC grounding inspection 4 Class I Laser Product 5 Rack Safety 5 Power Cords 8 Product Recycling and Disposal 8 Battery Return Policy 9 End of Life EOL Pl...

Страница 4: ...Port 19 IBM Spectrum Archive 20 Specifications 20 Physical specifications 20 Power specifications 21 Other specifications 21 Environmental specifications 21 Chapter 3 Installation 23 Avoiding Drive Da...

Страница 5: ...ing Maintenance Mode 48 Function Code 0 Maintenance Mode 49 Function Code 1 Run Drive Diagnostics 49 Function Code 2 Update Drive Firmware from FUP Tape 50 Function Code 3 Create FUP Tape 51 Function...

Страница 6: ...bels 75 Write Protect Switch 77 Handling Cartridges 78 Provide Training 78 Ensure Proper Packaging 78 Provide Proper Acclimation and Environmental Conditions 79 Perform a Thorough Inspection 79 Handle...

Страница 7: ...Contents QuantumLTO 8 HH SAS User s Guide vii Pre Call Checklist 89 Appendix A Error Codes and Messages 91 Appendix B Tape Alert Flags 101...

Страница 8: ...Contents viii QuantumLTO 8 HH SAS User s Guide...

Страница 9: ...f the Single character Display It gives instruction on inserting and removing a tape cartridge describes methods of updating drive firmware and explains how to clean the tape drive It also lists diagn...

Страница 10: ...dous to people A lightning bolt symbol always accompanies a danger notice to represent a dangerous electrical condition A sample danger notice follows WARNING An electrical outlet that is not correctl...

Страница 11: ...n battery To avoid possible explosion do not burn Exchange only with the Quantum approved part Recycle or discard the battery as instructed by local regulations Caution The system contains circuit car...

Страница 12: ...for proper fit It should be in place and secure 9 Check the product label on the tape drive to make sure that it matches the voltage at your outlet Tape drive AC grounding inspection 1 Power off the d...

Страница 13: ...r all rack mounted devices DANGER Always lower the leveling pads on the rack cabinet Always install stabilizer brackets on the rack cabinet To avoid hazardous conditions due to uneven mechanical loadi...

Страница 14: ...ing labels located on the equipment in the rack to determine the total power requirement of the supply circuit For sliding drawers Do not pull out or install any drawer or feature if the rack stabiliz...

Страница 15: ...x 2032 mm 30 x 80 in Ensure that all devices shelves drawers doors and cables are secure Ensure that the four leveling pads are raised to their highest position Ensure that there is no stabilizer brac...

Страница 16: ...ertified cord set consisting of a minimum 18 AWG Type SVT or SJT three conductor cord a maximum of 15 feet in length and a tandem blade grounding type attachment plug rated 15 amperes 250 volts For un...

Страница 17: ...r specific battery information The battery must be recycled or disposed of properly Recycling facilities may not be available in your area For information on disposal of batteries contact your local w...

Страница 18: ...ing notice is provided in accordance with California Code of Regulations Title 22 Division 4 5 Chapter 33 Best Management Practices for Perchlorate Materials This product part may include a lithium ma...

Страница 19: ...y data storage device that is designed to back up and restore open systems applications It is the sixth generation in the Ultrium series of products and is available with a Serial Attached SCSI interf...

Страница 20: ...um native data transfer rate of up to 300 MB per second Burst data transfer rate of 600 MB per second Dual port 6 Gbps Serial Attached Small Computer Systems Interface SAS Half height form factor Supp...

Страница 21: ...tumLTO 8 HH SAS User s Guide 13 Front Panel of the Drive Figure 3 Front panel element descriptions 1 Cartridge unload button 2 Ready light green 3 Encryption light white 4 Fault light amber 5 Single C...

Страница 22: ...r drive status and service only Drive Performance If you run applications that are highly dependent on tape processing speed take advantage of the significant performance improvements provided by this...

Страница 23: ...he Quantum Ultrium Tape Drive Generation 7 The drive performs the following functions Reads and writes Ultrium 8 cartridges to Ultrium 8 format including WORM and Data Encryption Reads and writes Ultr...

Страница 24: ...are as follows in the table below Table 2 Performance Parameters If the server s net compressed data rate is between two of the preceding native data rates the drive calculates the appropriate data ra...

Страница 25: ...access As an example a customer could capacity scale a data cartridge to 20 of its normal length which improves the average access time by almost a factor of 5 however it also reduces the native capa...

Страница 26: ...by the host application No checking is done if the firmware level is loaded by way of the host interface or the library interface SAS Interface The drive has a dual port 6 Gbps SAS Serial Attached SC...

Страница 27: ...ice drivers for the drive on the Internet You can access this material at the web site http www quantum com serviceandsupport Note If you do not have Internet access and you need information about dev...

Страница 28: ...folder tree structure Using the host operating system s graphical file manager reading data on a LTO tape cartridge is as easy as dragging and dropping Users can run any application designed for disk...

Страница 29: ...at 100 Vac 0 48 A Line current at 240 Vac 0 20 A Specification Measurement Maximum altitude for operating and storage 3048 m 10 000 ft Maximum altitude for shipping 12192 m 40 000 ft Environmental Fac...

Страница 30: ...Chapter 2 Introduction Specifications 22 QuantumLTO 8 HH SAS User s Guide...

Страница 31: ...e on page 24 Verify the Shipment on page 25 Inspect the Power Cord and Outlet on page 25 Position the Tape Drive on page 26 Install the SAS Host Adapter Card if required on page 26 Connect the SAS Int...

Страница 32: ...rotective packaging and install it directly into an enclosure without setting it down When this is not possible place the drive s packaging on a smooth level surface and place the drive on the packagi...

Страница 33: ...ser s Guide 6 68132 03 this guide SAS cables are not part of the ship group They must be ordered separately Inspect the Power Cord and Outlet 1 Inspect the power cord plug to ensure that it matches th...

Страница 34: ...Off the floor In a horizontal position Where the tape cartridge can be easily inserted The unit should not be stacked Do not place anything on top of the unit Install the SAS Host Adapter Card if req...

Страница 35: ...AS host adapter and for the tape drive 3 The tape drive has two SAS ports and can be connected to two servers if desired Refer to the appropriate figure that represents your configuration for cabling...

Страница 36: ...lready been installed turn power to the tape drive ON Connect Power 1 If the power cord has already been installed skip to step 3 2 Plug the power cord into the rear panel see Figure 4 on page 14 then...

Страница 37: ...tall Device Drivers A device driver is firmware that enables the tape drive to interact with a variety of servers See Supported device drivers on page 19 for instructions on downloading the latest dev...

Страница 38: ...support To update the firmware refer to the following sections Updating Firmware through the Host Interface Use xTalk SW to update your drive firmware Refer to xTalk User Guide for more details http w...

Страница 39: ...iefly displays 8 then becomes blank not lit when the firmware download and update is complete and there are no errors An error code will be displayed if a firmware download or update error has been de...

Страница 40: ...Chapter 3 Installation Updating firmware 32 QuantumLTO 8 HH SAS User s Guide...

Страница 41: ...ad Button Encryption status light Operating modes The drive functions in the following modes Operation mode functions include reading and writing data cartridge manipulation error reporting and firmwa...

Страница 42: ...he unit is powered on but idle the Ready light see 2 in Figure 3 on page 13 is solid green when it is performing a function the Ready light is flashing green Single character Display SCD The SCD 5 in...

Страница 43: ...k or a SCSI command or update the drive firmware Note If the drive dump is stored in RAM memory SCD Dot on solid the dump will be lost when you turn OFF the power or reset the drive Status Lights The...

Страница 44: ...lights and Single character Display SCD and provides an explanation of what each condition means Table 3 Meaning of Status Lights and Single character Display SCD Power On Reset Initialization random...

Страница 45: ...Off Off Off Off If the drive contains a cartridge during the power on cycle the drive completes POST and slowly rewinds the tape the process may take up to ten minutes The light stops blinking and be...

Страница 46: ...d SCD Dot lights ON 5 SCD will go blank Ready light ON after a successful power on or reset If an error is detected during the power on or reset the tape drive posts an error code to the SCD To determ...

Страница 47: ...f using an FUP cartridge The SCD will be off if using the host interface For more information see Updating firmware on page 30 Off Flashing twice per second Off Off Off The drive detected an error and...

Страница 48: ...ght is flashing and 0 appears in the SCD Note While in maintenance mode the drive does not accept host interface commands Note If you attempt to enter Maintenance Mode with a cartridge in the drive th...

Страница 49: ...e is in maintenance mode Ready light is flashing and Fault light is On for Maintenance mode refer to Function Code 4 Force a Drive Dump on page 52 If the drive is in operating mode Ready light is On o...

Страница 50: ...he tape load compartment Note If the cartridge is already in an ejected position and you want to reinsert it remove the cartridge then insert it again If the cartridge is already loaded and you cycle...

Страница 51: ...rites any pertinent information to the cartridge memory Mid tape Recovery If reset occurs while a cartridge is loaded the drive will slowly rewind the tape and eject the cartridge If a power cycle occ...

Страница 52: ...th the Fault light On means to insert a cartridge not clean the drive head To clean the head insert the cleaning cartridge into the tape load compartment see Figure 3 on page 13 The drive performs the...

Страница 53: ...age 45 describes each diagnostic and maintenance function that the drive can perform gives the function code which appears on the Single character Display SCD and directs you to the instructions for p...

Страница 54: ...dump from flash memory Function Code 5 Copy Drive Dump on page 52 6 Run Host Interface Wrap Test Performs a check of the circuitry from and to the connector Function Code 6 Run Host Interface Wrap Te...

Страница 55: ...that the drive can read from and write to tape Function Code F Write Performance Test on page 59 H Test Head Performs tests to ensure that the tape drive s head and tape carriage mechanics are workin...

Страница 56: ...inserted Maintenance functions cannot be performed concurrently with read or write operations While in maintenance mode the drive does not receive host interface commands from the server Exiting Main...

Страница 57: ...the test to complete Compare the recorded time with the Approximate Run Time above If the test runs successfully but the execution time is significantly longer than the Approximate Run Time run Funct...

Страница 58: ...again or reboot the drive by pressing and holding the Unload button for 10 seconds Function Code 2 Update Drive Firmware from FUP Tape Caution When updating drive firmware do not power off the drive u...

Страница 59: ...his function insert only a scratch blank data cartridge or a cartridge that may be overwritten During the test the drive overwrites the data on the cartridge Note If you inserted an invalid tape cartr...

Страница 60: ...oad button once per second until 4 appears in the SCD If you cycle past the desired code press the Unload button once per second until the code reappears 3 Press and hold the Unload button for three o...

Страница 61: ...tion 5 1 copy dump to tape clears RAM dump 5 2 copy dump to flash memory clears RAM dump 5 3 erase flash memory If you cycle past the desired code press the Unload button once per second until the cod...

Страница 62: ...of the drive Connect the wrap plug to the SAS port to be tested 2 Place the drive in Maintenance Mode For instructions see Entering Maintenance Mode on page 48 3 Press the Unload button once per secon...

Страница 63: ...ction Code 7 Run RS 422 Wrap Test Note This function is described here for information only It is not supported on the LTO 6 7 or 8 Tape Drives This test causes the drive to perform a check of the cir...

Страница 64: ...he Unload button once per second until the code reappears 3 Press and hold the Unload button for three or more seconds then release it to select function 8 The SCD changes to a flashing C requesting a...

Страница 65: ...view the most recent error code 4 Press and release the Unload button again to view successive error codes Let two to three seconds pass between each depression The Ready light and Fault light will f...

Страница 66: ...d the cartridge Caution When you perform this test data on the suspect tape will be overwritten Note If you inserted an invalid tape cartridge error code J or 7 appears in the SCD If you inserted a wr...

Страница 67: ...ress the Unload button to stop the diagnostic and exit maintenance mode Pressing the Unload button once will abort the test at the end of the current test loop Pressing the Unload button twice will ab...

Страница 68: ...loop Total Number of Loops 10 Function Code H performs tests to ensure that the tape drive s head and tape carriage mechanics work correctly Once you begin this test the diagnostic begins the loop se...

Страница 69: ...the diagnostic will loop and begin again To stop the loop press the Unload button for one second and release When the diagnostic ends 0 temporarily appears in the SCD and the tape drive exits Maintena...

Страница 70: ...cartridge and exits Maintenance Mode after the cartridge is removed 1 Place the drive in Maintenance Mode For instructions see Entering Maintenance Mode on page 48 2 Press the Unload button once per s...

Страница 71: ...either case the tape drive unloads the cartridge and exits Maintenance Mode after the cartridge is removed 1 Place the drive in Maintenance Mode For instructions see Entering Maintenance Mode on page...

Страница 72: ...structions see Exiting Maintenance Mode on page 48 4 To disable Post Error Reporting Press and hold the Unload button for three seconds while P appears in the SCD The SCD changes to U after you releas...

Страница 73: ...ting For instructions see Exiting Maintenance Mode on page 48 4 To disable Post Error Reporting Press and hold the Unload button for three seconds while P appears in the SCD The SCD changes to U after...

Страница 74: ...Chapter 4 Operations Diagnostic and Maintenance Functions 66 QuantumLTO 8 HH SAS User s Guide...

Страница 75: ...M Write Once Read Many Cartridge Cleaning cartridge To ensure that your Quantum Ultrium Tape Drive conforms to Quantum s specifications for reliability use only Quantum LTO Ultrium tape cartridges You...

Страница 76: ...pter 5 Media 68 QuantumLTO 8 HH SAS User s Guide Figure 8 The Quantum LTO Ultrium Data Cartridge 1 LTO cartridge memory 2 Cartridge door 3 Leader Pin 4 Write protect Switch 5 Label area 6 Insertion gu...

Страница 77: ...rium Tape Drives use a linear serpentine recording format The native data capacity and recording format of Ultrium data cartridges is as follows Type Color Ultrium 8 Burgundy Ultrium 8 WORM Burgundy a...

Страница 78: ...tridge For more information see Write Protect Switch on page 77 Data Cartridge Native Data Capacity Recording Format Ultrium 8 12000 GB 30000 GB at 2 5 1 compression Reads and writes data on 6656 trac...

Страница 79: ...y Table 6 Cartridge Compatibility Table 7 Ultrium cartridge compatibility with Ultrium tape drives Type Load Unload Cycles Ultrium 8 20 000 20k Ultrium 7 20 000 20k Ultrium 6 20 000 20k Ultrium 5 20 0...

Страница 80: ...ape cartridge is loaded into the drive Note WORM format is not available for Ultrium 7 M8 format cartridges Worm Media Because standard read write media are incompatible with the WORM feature a specia...

Страница 81: ...12000 GB and compressed data capacity is 30000 GB When the drive senses a WORM cartridge the firmware prohibits the changing or altering of user data already written on the tape The firmware notes th...

Страница 82: ...ridge expires It is no longer usable and must be replaced Cartridge Memory Chip LTO CM All generations of the Quantum LTO Ultrium Data Cartridges include a Linear Tape Open Cartridge Memory LTO CM chi...

Страница 83: ...de are M8 Quantum strongly recommends that M formatted media are labelled with M8 bar code labels Bar Code Labels A bar code label contains A volume serial number VOLSER that is human readable A bar c...

Страница 84: ...ulling it at a right angle to the cartridge case Use peel clean labels that do not leave a residue after being removed If there is glue residue on the cartridge remove it by gently rubbing it with you...

Страница 85: ...termines whether you can write to the tape If the switch is set to The locked position solid red data cannot be written to the tape The unlocked position black void data can be written to the tape If...

Страница 86: ...ling in places where people gather Ensure that anyone who handles tape has been properly trained in handling and shipping procedures This includes operators users programmers archival services and shi...

Страница 87: ...exist near high current cables or power supplies Such exposure can cause the loss of recorded data or make the blank cartridge unusable Maintain the conditions that are described in Environmental and...

Страница 88: ...e Cartridge Carefully Do not drop the cartridge If the cartridge drops slide the cartridge door back and ensure that the leader pin is properly seated in the pin retaining spring clips see 2 in Figure...

Страница 89: ...tape cartridge acclimate it to the operating environment to prevent condensation in the drive the time will vary depending on the environmental extremes to which the cartridge was exposed The best st...

Страница 90: ...rtridge If a tape cartridge must be disposed of in a secure manner you can erase the data on the cartridge with a high energy ac degausser use a minimum of 4000 oersted peak field over the entire spac...

Страница 91: ...AS User s Guide 83 offset 90 degrees from each other to accomplish complete erasure in one pass for higher throughput Degaussing makes the cartridge unusable If you burn the cartridge and tape ensure...

Страница 92: ...Chapter 5 Media Disposing of Tape Cartridges 84 QuantumLTO 8 HH SAS User s Guide...

Страница 93: ...ble for updating Firmware For optimum performance the customer must obtain the latest level of firmware for the unit by downloading the firmware from the web site http www quantum com serviceandsuppor...

Страница 94: ...e case the cartridge door and the write protect switch for damage 3 Inspect the rear of the cartridge the part that you load first into the tape load compartment and ensure that there are no gaps in t...

Страница 95: ...t eject properly contact your service representative Procedure 3 Checking SAS Host Connections Check the host connections for your drive by following the steps below If your server is not communicatin...

Страница 96: ...ncludes Test Cartridge Media diagnostic that verifies whether a suspect cartridge and its magnetic tape are acceptable for use Statistical Analysis and Reporting System SARS to assist in isolating fai...

Страница 97: ...are securely tightened 2 Verify that the drive s firmware is at the most recent level To determine the latest release of firmware visit the web See Updating firmware on page 30 for instructions on do...

Страница 98: ...sure that the drive can read from and write to tape Function Code H Test Head on page 60 to ensure that the tape drive s head and tape carriage mechanics work correctly Function Code J Fast Read Write...

Страница 99: ...red with a cartridge in the drive push the Unload button to eject the cartridge To clear the SCD error code and power cycle the drive press the Unload button for ten seconds A drive dump will be creat...

Страница 100: ...ove any blockage that prevents air from flowing freely through the tape drive Ensure that the operating temperature and airflow is within the specified range see Specifications on page 20 Clear the er...

Страница 101: ...t a drive dump from one of the following Note Do not force a new dump one already exists Server s host interface by using a device driver utility or system tool for instructions about reading a drive...

Страница 102: ...defective cartridge and discard it If the operation fails and another tape drive is available insert the cartridge into the other unit and retry the operation If the operation fails discard the defect...

Страница 103: ...If the diagnostic succeeds the error was temporary If another tape drive is not available insert a scratch data cartridge into the unit and run Function Code 1 Run Drive Diagnostics on page 48 If the...

Страница 104: ...e Function Code 8 Unmake FUP Tape Drive will not Unmake FUP Tape Maintenance Code 8 with a cartridge that is not an FUP tape If the tape cartridge is the correct media type try another tape cartridge...

Страница 105: ...uring the test The test will fail if the correct interface wrap tool is not attached 2 If the correct interface wrap tool was attached during the test replace the drive The error code clears when you...

Страница 106: ...oop by pressing the Unload button once to stop the diagnostic after the completion of the first loop then record the time it takes for the test to complete Compare the recorded time with the Approxima...

Страница 107: ...gher Data Cartridges only Retry the encryption operation with the tape cartridge in another encryption enabled drive Replace the media if the problem repeats with the same tape cartridge in multiple d...

Страница 108: ...Appendix A Error Codes and Messages 100 QuantumLTO 7 HH SAS User s Guide...

Страница 109: ...NSI that defines conditions and problems that are experienced by tape drives The technology enables a server to read TapeAlert flags from a tape drive through the host interface The server reads the f...

Страница 110: ...Appendix B Tape Alert Flags 102 QuantumLTO 7 HH SAS User s Guide...

Страница 111: ...compression as compared to the quantity of data that can be stored without compression In 2 5 1 compression two and a half times as much data can be stored with compression as can be stored without c...

Страница 112: ...ng of a specific device to perform a function asynchronous Pertaining to two or more processes that do not depend upon the occurrence of specific events such as common timing signals attention notice...

Страница 113: ...ransmit at a given moment byte A string consisting of a certain number of bits usually 8 that are treated as a unit and represent a character A fundamental data unit C capacity The amount of data that...

Страница 114: ...t connection A connection between a channel path and a drive caused when a unit check occurs during an I O operation controller A device that provides the interface between a system and one or more ta...

Страница 115: ...y that can receive and send data device driver A file that contains the code needed to use an attached device DIAG Diagnostic section of maintenance information manual differential See High Voltage Di...

Страница 116: ...ocode in response to a detected subsystem error FC Feature code FCC Federal communications commission FE Field engineer customer engineer or service representative field replaceable unit FRU An assemb...

Страница 117: ...conversion speed matching encoding first level error recovery and interfaces to one or more tape drives FP File protect frayed Damaged as if by an abrasive substance FRU Field replaceable unit FSC Fau...

Страница 118: ...re characters used to identify or name data element and possibly to indicate certain properties of that data element 3 A sequence of bits or characters that identifies a program device or system to an...

Страница 119: ...high capacity The Ultrium format is the preferred format when capacity rather than fast access is the key storage consideration An Ultrium cartridge has a compressed data capacity of up to 800 GB 2 1...

Страница 120: ...e millionth of microcode 1 One or more micro instructions 2 A code representing the instructions of an instruction set implemented in a part of storage that is not program addressable 3 To design writ...

Страница 121: ...system The oersted is the magnetic field strength in the interior of an elongated uniformly wound solenoid that is excited with a linear current density in its winding of one abampere per 4 centimeter...

Страница 122: ...ome page PROM Programmable read only memory R rack A unit that houses the components of a storage subsystem such as the library rackmount kit A packaged collection of articles used to install the rack...

Страница 123: ...in which at least one of the system signals represents mechanical motion Small Computer Systems Interface SCSI A standard used by computer manufacturers for attaching peripheral devices such as tape...

Страница 124: ...ating independently of or asynchronously with a controlling system sync Synchronous synchronize Occurring with a regular or predictable time relationship T tachometer tach A device that emits pulses t...

Страница 125: ...d conveniently as a unit VPD Vital product data The information contained within the tape drive that requires nonvolatile storage used by functional areas of the drive and information required for man...

Страница 126: ...Glossary 118 Quantum LTO 7 HH SAS User s Guide...

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