background image

Chapter 4  Theory
Data Compression

38

LTO-3 Tape Drive User’s Guide

Software data compression should never be used because the LTO-3 Tape 

Drive's built-in intelligent data compression is much more efficient than 

software data compression systems.
The LTO-3 Tape Drive uses a derivative of ALDC-2 lossless data 

compression that includes additional control codes for intelligent data 

compression.

Summary of Contents for LTO3 A-Series

Page 1: ...72 7DSH ULYH 72 8VHU V XLGH 8VHU V XLGH 8VHU V XLGH 8VHU V XLGH 8VHU V XLGH 8VHU V XLGH...

Page 2: ...this publication from time to time without notice COPYRIGHT STATEMENT Copyright 2005 by Quantum Corporation All rights reserved Your right to copy this manual is limited by copyright law Making copie...

Page 3: ...nspection 3 Quick Start Guide 4 Internal LTO 3 Tape Drive Quick Start 4 Desktop LTO 3 Tape Drive Quick Start 5 Internal Tape Drive Guidelines and Cautions 5 Chapter 2 Installation 7 Drive Installation...

Page 4: ...r Cord 21 Installing the LTO Driver 21 Registering Your Tape Drive 21 Chapter 3 Operation 23 Understanding the Front Panel Display 24 Blink Codes 25 Using LTO Cartridges 26 Loading a Cartridge 26 Unlo...

Page 5: ...48 Electromagnetic Compatibility EMC 50 Disposal of Electrical and Electronic Equipment 51 Chapter 6 UNIX Settings 53 A Word About SCSI Controllers 54 Configuring for the DEC Compaq UNIX Environment 5...

Page 6: ...0 64 Finding Current Hardware Driver Configuration 64 Attaching the LTO 3 Tape Drive 64 Chapter 7 Troubleshooting Guide 67 Installation Best Practices 67 Follow SCSI Best Practices 67 SCSI Host Bus Ad...

Page 7: ...Cable Connector 14 Figure 7 Rear View of the Internal LTO 3 Tape drive 15 Figure 8 Two SCSI Termination Examples for the Internal LTO 3 Tape Drive 16 Figure 9 Switches and Connectors on the Back of t...

Page 8: ...Figures viii LTO 3 Tape Drive User s Guide...

Page 9: ...nector Pin Assignments LTO 3 16 Table 3 ADT Bus Connections 17 Table 4 LTO 3 Tape Drive Blink Codes 25 Table 5 Physical Specifications 40 Table 6 Voltage and Current 42 Table 7 Power Dissipation 42 Ta...

Page 10: ...Tables x LTO 3 Tape Drive User s Guide...

Page 11: ...ions The drive is suited for mid range to high end servers mainframe systems and tape library automation systems Audience This document was written for users of the LTO 3 Tape Drive Purpose This docum...

Page 12: ...ications Chapter 3 Operation explains the use and operation of the drive and describes maintenance procedures including drive parking Chapter 4 Theory describes the theory of operation behind the driv...

Page 13: ...al Engineering Documents 15 Inverness Way East Englewood CO 80112 800 854 7179 or 303 397 2740 Contacts Quantum company contacts are listed below Quantum Corporate Headquarters 0 To order documentatio...

Page 14: ...outh America 949 725 2100 or 800 284 5101 Asia Pacific Rim International Code 61 7 3839 0988 Europe Middle East Africa International Code 44 0 1256 848748 Send faxes for the Customer Support Departmen...

Page 15: ...nd Cautions Quick Start Guide Internal Tape Drive Guidelines and Cautions Overview 1 The LTO 3 is a high performance 16 channel tape drive that complies with the LTO interchange specifications The dri...

Page 16: ...bay Desktop LTO 3 Tape Drive is a stand alone unit with a built in power supply Figure 1 Typical Internal and Desktop Configurations Features 1 The following list summarizes the key features of the L...

Page 17: ...namics with isolated HTI chamber SmartVerify includes two levels of ECC for extra data safety and protection from errors Reliable tape picking implementation for increased reliability Custom designed...

Page 18: ...hem if necessary SCSI ID 6 Terminator Power Disabled See Configuring an LVD Drive on page 8 3 Turn off your computer remove its covers and power cable and select a mounting bay for the drive See Mount...

Page 19: ...tain some exposed components that are sensitive to static electricity To reduce possible damage from static discharge the drives are shipped in a protective antistatic bag Do not remove the drive from...

Page 20: ...ischarge any static electricity buildup from your body Always lay the drive either on top of the antistatic bag or place it inside of the bag to reduce possible damage from static discharge Install LV...

Page 21: ...LTO 3 Tape Drive Installing a Desktop LTO 3 Tape Drive Drive Installation Instructions 2 After unpacking and inspecting your shipping containers and reviewing the installation guidelines and cautions...

Page 22: ...stering Your Tape Drive on page 18 Configuring an LVD Drive 2 Before you install the LVD tape drive in your computer you may need to configure the drive s SCSI ID and terminator power features The def...

Page 23: ...lly uses ID 7 In some systems the boot drive uses ID 0 or ID 1 Avoid setting your drive s SCSI ID to these settings SCSI ID Jumpers 1 2 3 4 5 6 7 8 0 Open Open Open Open 1 Shunted Open Open Open SCSI...

Page 24: ...pen Shunted Open 5 Shunted Open Shunted Open 6 default Open Shunted Shunted Open 8 Open Open Open Shunted 9 Shunted Open Open Shunted 10 Open Shunted Open Shunted 11 Shunted Shunted Open Shunted 12 Op...

Page 25: ...up and the side of the drive should be within 5 degrees of horizontal Horizontally the base of the drive must be within 15 degrees of horizontal and the drive must not be upside down Figure 3 Accepta...

Page 26: ...removable medium device It may also be used in the automation device containing the removable medium device The attachment of the connector to the circuit board that is surface mount or through hole i...

Page 27: ...Tape Drive User s Guide 13 connector in a removable medium or automation device is beyond the scope of this standard Figure 5 ADI Fixed Board Connector ADI Free Cable Connector 2 The free cable conne...

Page 28: ...pin 1 on end A is wired to pin 1 on end B pin 2 on end A to pin 2 on end B and so forth Connecting a SCSI Cable 2 The internal LTO 3 Tape Drive has an Ultra 160 SCSI interface terminated by a 68 pin...

Page 29: ...must place a SCSI bus terminator or a SCSI device with termination enabled at the end of the SCSI chain Two examples of SCSI termination are shown in figure 8 The Internal LTO 3 Tape Drive provides t...

Page 30: ...onnector It is located on the lower left side of the back of the drive see figure 7 Table 2 shows the pin descriptions for the serial interface connector Table 2 Serial Interface Connector Pin Assignm...

Page 31: ...gout Sensea M Sense automation port A data transfer device shall use this connection to sense the presence or absence of an automation device on the ADT bus Senseaux O Sense A vendor unique sense conn...

Page 32: ...er See the Resource CD This driver is not necessary with commercial backup application software Registering Your Tape Drive 2 After you install the internal tape drive be sure to register it Registeri...

Page 33: ...e If you change the SCSI ID on the tape drive turn off the tape drive before changing the SCSI ID The change takes effect when you turn on the drive Figure 9 Switches and Connectors on the Back of the...

Page 34: ...last or only device in a SCSI chain install a terminating plug on the unused SCSI connector See figure 10 for two SCSI termination examples Figure 10 SCSI Termination Examples for the Desktop LTO 3 Ta...

Page 35: ...erver 2003 Windows XP or Microsoft Windows 2000 operating system install the LTO driver See the Resource CD This driver is not necessary with commercial backup application software Registering Your Ta...

Page 36: ...Chapter 2 Installation Installing a Desktop LTO 3 Tape Drive 22 LTO 3 Tape Drive User s Guide...

Page 37: ...hapter 3 3Operation This chapter describes how to operate the LTO 3 Tape Drive Topics covered in this chapter are Understanding the Front Panel Display Blink Codes Using LTO Cartridges Drive Maintenan...

Page 38: ...y The LTO 3 Tape Drive has four LEDs on the front panel The LED colors and functions are summarized below Power LED green Activity LED green Error LED orange Status LED amber The Activity Error and St...

Page 39: ...leaning Request ON Hardware error Fast Positioning loading unloading rewinding spacing or locating Slow Tape Active writing reading or verifying Slow Manual intervention required ON Power On Self Test...

Page 40: ...a previous ejection a SCSI command or Library command can be issued to automatically retract the cartridge into the drive If the cartridge is already in the slot from a previous ejection the Load Unl...

Page 41: ...the cartridge but not written to it If you slide the switch all the way toward the corner see figure 12 data can be read from and written to the cartridge Figure 12 Ultrium Cartridge Showing Write Pro...

Page 42: ...ating environment The conditioning process requires exposure to the operating environment for a time equal to or greater than the time away from the operating environment up to a maximum of 24 hours K...

Page 43: ...omatically or you may need to press the load unload button to remove the cartridge depending on the drive configuration Each time you use the cleaning cartridge write the date on the label for future...

Page 44: ...up to enter park mode Using the Load Unload Button to Park the Drive 3 To park the drive manually press and hold the Load Unload button for 15 seconds or more After you release the Load Unload button...

Page 45: ...ty Data Compression Track Layout 4 With the LTO 3 Tape Drive there are 704 data tracks on the LTO tape numbered 0 through 703 Data track 703 is the track closest to the bottom edge of the tape the ref...

Page 46: ...n a serpentine fashion starting in data band 0 The tape contains 44 track groups 22 written in the forward direction and 22 written in the reverse direction Even numbered wraps are recorded in the for...

Page 47: ...e high bandwidth is needed to support look aside data compression in the case of compressible data being transferred from SCSI at 160 Mbytes sec Data Integrity 4 The mechanical and electrical design o...

Page 48: ...As data is written to tape the C1 ECC is checked and an interrupt generated if there is an error The C1 ECC read from memory is the ECC that is written to tape When data is read from tape and stored i...

Page 49: ...ct servo tracking is re established Data Compression 4 Typical data streams of text graphics software code or other forms of data contain repeated information of some sort whether it is at the text le...

Page 50: ...me time interval Data Compression Considerations 4 In an effective data compression method several factors are important The amount of compression The amount of compression is measured by the compress...

Page 51: ...lligent data compression The intelligent data compression hardware determines the compressibility of each record If the size of the record is larger after a compression attempt than the native uncompr...

Page 52: ...uld never be used because the LTO 3 Tape Drive s built in intelligent data compression is much more efficient than software data compression systems The LTO 3 Tape Drive uses a derivative of ALDC 2 lo...

Page 53: ...for the LTO 3 Tape Drive The topics covered in this chapter are Physical Specifications Power Specifications Drive Performance Specifications Environmental Requirements Reliability Mean Time Between F...

Page 54: ...Bezel Internal SCSI Drive with Bezel Desktop SCSI Drive Height 3 25 inches 82 6 mm max 3 31 inches 84 3 mm 6 8 inches1 172 7 mm Width 5 75 inches 146 05 0 25 5 81 inches 147 8 mm 7 61 inches 193 3 mm...

Page 55: ...14 Internal LTO 3 Tape Drive Dimensions 84 3 147 8 48 90 0 60 From Upper Bezel Mounting Tabs 48 90 0 60 From Upper Bezel Mounting Tabs Length of Drive without Bezel Less connectors Less connectors 205...

Page 56: ...7 Power Dissipation Specification 12 VDC 5VDC DC Voltage Tolerance 12 00 or 10 5 00 or 5 Non operating max voltage 14 Volts peak 7 Volts peak Max operating current Continuous Peak 1 2 amps RMS 4 0 amp...

Page 57: ...ells per mm Track density 70 tracks per mm Error recovery Read after write Reed Solomon ECC 2 levels Recording unrecoverable errors Less than 1 in 1017 data bits Recording undetectable errors Less tha...

Page 58: ...age data access time 609 m tape from BOW beginning of wrap 58 seconds Maximum data access time 609 m tape from BOW 115 seconds Average rewind time 609 m tape 115 seconds Tape speed Up to 5 9 meters pe...

Page 59: ...integrity Table 10 summarizes the reliability specifications Humidity gradient 10 per hour 10 per hour Altitude max 10 000 feet MSL at 25 C 40 000 feet power off Shock 1 2 sine wave 10 Gs peak 11 mse...

Page 60: ...th the unit operated at full load and 25 C Specification Description Non recoverable error rate Less than 1 in 1017 bits Error recovery and control Error correction code techniques C1 and C2 ECC Read...

Page 61: ...rtridge Specifications 5 Environmental Considerations 5 Table 11 lists the basic environmental tolerances for LTO Ultrium cartridges Table 11 Environmental Tolerances If during storage and or transpor...

Page 62: ...ty Regulatory Compliance 5 These drives comply with the safety and EMC regulations listed in the following tables Safety Compliance 5 Country Regulatory Organization Compliant to United States Underwr...

Page 63: ...n Electrotechnique the European Committee for Electrotechnical Standardization CENELEC IEC 950 EN60950 including amendments A1 A2 A3 A4 A11 Member nations of IECEE IECEE International Electrotechnical...

Page 64: ...er CISPR 22 1997 EN55022 1998 and Immunity per CISPR 24 1997 EN55024 1998 Australia and New Zealand Standards Australia Spectrum Management C Tick AS NZS 3548 1995 same as CISPR 22 Japan Voluntary Con...

Page 65: ...other waste Instead it should be handed over to a designated collection point for the recycling of electrical and electronic equipment The separate collection and recycling of your waste equipment at...

Page 66: ...Chapter 5 Specifications Disposal of Electrical and Electronic Equipment 52 LTO 3 Tape Drive User s Guide...

Page 67: ...ered in this chapter are A Word About SCSI Controllers Configuring for the DEC Compaq UNIX Environment Configuring for the Sun Environment Solaris 2 4 2 5 2 6 7 8 and 9 Configuring for the IBM AIX Env...

Page 68: ...inding Existing SCSI Controllers and Devices 6 SCSI ID 7 is almost always dedicated to the SCSI controller Never configure your target device for ID 7 unless you are absolutely sure that the controlle...

Page 69: ...4 000 bpi and the tape length is 1800 feet For commands that use a blocking factor we recommend a blocking factor of 64 as a minimum 128 is recommended Configuring for the Sun Environment Solaris 2 4...

Page 70: ...ive not be attached to esp controllers This controller is not fast enough to work with the LTO 3 Tape Drive The minimum recommended controller would be a glm controller which is an Ultra Wide controll...

Page 71: ...iable record size not limited to 64k Uses Mode Select Page 10h to enable disable compression Once st conf has been modified the kernel must be reconfigured by booting the system using the boot r comma...

Page 72: ...configured to work with AIX Versions 4 1 x and later by using the SMIT Other SCSI Tape Drive option To configure AIX using the SMIT utility use the following procedure 1 Enter SMIT at the Tape Drive m...

Page 73: ...s command produces output similar to adapter 0x6400 0x64FF 11 type alad ha 0 bus 0 id 7 fts st0 The current tape drives can be found using the command grep tape usr adm hwconfig Note We suggest using...

Page 74: ...he instructions below to add an LTO 3 Tape Drive 1 From the menu choose Configure a SCSI or Enhanced IDE tape drive 2 From the next menu choose Install a SCSI tape drive 3 When prompted enter the SCSI...

Page 75: ...or be applicable to the LTO 3 Tape Drive execute the command man tape for the specifics on how the tape command works The following tape commands are not available for use with the LTO 3 Tape Drive g...

Page 76: ...install the proper SCSI and tape device drivers If you executed the cat command above you have ensured that the SCSI driver for your controller is installed To view currently loaded modules execute t...

Page 77: ...pe drive is present on SCSI controller 1 at SCSI ID address 6 Available SCSI IDs are 0 2 3 5 6 8 15 on controller 0 1 5 and 8 15 on controller 1 this controller supports Wide Ultra SCSI Modifying the...

Page 78: ...lled SCSI controllers and devices use the command can ioscan f This command lists all the system devices and their device names Attaching the LTO 3 Tape Drive 6 Choose a SCSI address that does not con...

Page 79: ...t has not already been used You can also choose a unique device name such as cnb to more easily remember which device name will enable data compression during write Refer to the man pages for mksf to...

Page 80: ...Chapter 6 UNIX Settings Configuring for HP UX 11 0 66 LTO 3 Tape Drive User s Guide...

Page 81: ...unter a problem with your tape drive Topics covered in this chapter are Installation Best Practices Troubleshooting Suggestions Installation Best Practices 7 Follow SCSI Best Practices 7 When installi...

Page 82: ...ord your current system configuration For example in Windows 2000 you may find information on any currently installed SCSI HBA by Double clicking on Administrative Tools in the Control Panel Clicking...

Page 83: ...ved Otherwise ensure that SCSI HBA is compatible with system does not have burnt components Reseat the SCSI HBA in a different PCI slot and reboot the computer If the system still does not boot contac...

Page 84: ...ower connector Otherwise the tape drive may be bad and Customer Support should be contacted Desktop tape drive 7 1 Turn power off to the tape drive and reseat the AC power cord 2 Power on the tape dri...

Page 85: ...e using a proper SCSI cable and proper termination 5 Check the SCSI cable for bent pins 6 Try to use SCSI cable from other SCSI controller bus chain if possible 7 If these suggestions do not help the...

Page 86: ...t adapter found at PCI 0 16 0 You may also be able to use the command cat proc scsi scsi You may see output similar to Host scsi0 Channel 0 Id 6 Lun 00 Vendor CERTANCE Model ULTRIUM 3 Type SequentialA...

Page 87: ...all the LEDs are off except Power and a tape cannot be inserted into the tape drive examine the tape and the inside of the tape drive Be sure there are no tape labels interfering with tape insertion B...

Page 88: ...cts the problem has been resolved 5 If a message similar to the following appears when the eject button is pushed use the mt offline command to eject the tape You cannot eject the cartridge because th...

Page 89: ...rom the drive you may need to remove the cartridge manually as described under Manually Removing a Cartridge on www quantum com support Problems During Backup Restore Operations 7 Backup Failures A ba...

Page 90: ...USLY WRITTEN DATA ON THE TAPE WILL BE DESTROYED Use a second tape for the diagnostic test If the diagnostic test passes on the second tape use the tape for the backup process and remove the first tape...

Page 91: ...formance Do not use the cartridge for further backup operations a Cartridge Memory chip failure may have occurred in the tape cartridge or a tape drive failure may have occurred Use another tape to pe...

Page 92: ...POST Failure Hardware or Firmware Error or Manual Intervention Required the drive may be bad Contact Customer Support 1 If you have a problem with inserting a cleaning cassette and receive the message...

Page 93: ...ial LVD SCSI controller capable of a minimum of 80 Mbytes s and MUST not share the same SCSI bus as another active SCSI device such as hard drives 1 Is the tape drive attached to an LVD SCSI controlle...

Page 94: ...nsfer The resulting calculation shows the tape drive performing at an acceptable rate 3 If you believe that the write read transfer is slow even after using the diagnostic software write read test use...

Page 95: ...26 write protecting 27 77 Checking SCSI termination desktop drive 20 internal drive 15 Cleaning a tape drive 29 Computer boots but does not recognize tape drive 69 Computer will not boot 69 Configuri...

Page 96: ...quirements 44 Error correction code 34 External drive quick start 5 F Features 2 Front panel display 24 G Guidelines internal drive 5 H HP UX 11 0 settings 64 I IBM AIX 4 1 x and later settings 58 Inj...

Page 97: ...nal drive 11 O Overview xi P Parking a tape drive 30 Physical specifications 40 Power cable connection desktop drive 21 internal drive 18 Power specifications 42 Q Quick start desktop drive 5 external...

Page 98: ...recognized by operating system or application 71 Tape will not eject from drive 74 TapeAlert messages 77 Terminator power internal drive 10 Track layout 31 Troubleshooting 69 backup restore problems...

Reviews: