HP A3716A Autoloader Users Guide Front Cover (Replace with Color Cover Artwork)
Product Details Note your autoloader details here so you can find them easily when you need them.
© Copyright 1996 by Hewlett-Packard Limited. Servicing The information contained in this document is subject to change without notice. Any servicing, adjustment, maintenance or repair must be performed only by authorized service-trained personnel. This document contains proprietary information which is protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language without the prior written consent of Hewlett-Packard Limited.
Introducing the HP A3716A Autoloader The HP A3716A autoloader combines a DDS-3 format drive with a changer mechanism which accesses one of six cartridges in a removable magazine. The DDS-3 (Digital Data Storage) format is the fourth generation of formats based on DAT (Digital Audio Tape) technology. A single 125m DDS-3 cartridge stores 24 GB of data using 2:1 data compression.
How To Use this Manual This manual is in four parts. Part 1: Installation Instructions Part 1 (Chapters 1 and 2) takes you through unpacking the autoloader, installing and configuring it, and testing that the installation is successful. Part 2: Use and Care Instructions Part 2 (Chapters 3 through 8) explains how to use the autoloader and cartridges: Chapter 3 describes the front panel indicators and controls and tells you how to load and unload the magazine and cartridges.
Contents Introducing the HP A3716A Autoloader How To Use this Manual ii i Part 1: Installation Instructions 1 Unpacking and Preparing for Installation Unpacking the Autoloader 1-2 Checking Computer Requirements Planning the SCSI Bus 1-3 Selecting a Site 1-4 1-3 2 Installing Your Autoloader The Rear Panel of the Autoloader 2-3 Installation on Series 700, 800 and 900 Systems 2-4 Configuring Software on Series 700 and 800 (HSC only) Systems Running HP-UX 10.
5 Choosing a Backup Strategy Method 1: One Magazine Per Week Method 2: Magazine Rotation 5-3 5-2 6 Care of Cartridges and Drive Head Cleaning 6-2 Cleaning Cartridge Life 6-3 Write-Protecting a Cartridge 6-4 Labeling Cartridges and Magazines 6-4 Temperature and Condensation 6-5 Power-Cycling 6-5 Caring for Cartridges 6-6 Maximizing Tape Life 6-6 Storing Cartridges 6-6 Choosing Cartridges 6-7 Mixing Cartridges in a Magazine 6-8 7 Upgrading Firmware by Cartridge Upgrade Problems 7-3 8 Troubleshooting Probl
Part 1 Installation Instructions Chapter 1: Unpacking and Preparing for Installation Chapter 2: Installing the Autoloader
Installation Instructions Part 1-6
1 Unpacking and Preparing for Installation This chapter describes: n Unpacking the autoloader n The equipment and information you need before starting the installation n An overview of the installation procedure Time required: approximately 10 minutes
Unpacking and Preparing for Installation Unpacking the Autoloader Unpacking the Autoloader Unpack the box containing the autoloader and check that you have the following items: q Autoloader with SCSI terminator attached to the rear q SCSI cable q Power cable* q User’s Guide q Magazine (in plastic case) with 5 DDS-3 cartridges and one cleaning cartridge *Hewlett-Packard supplies the correct power cable for each country. Your power cable may differ from the illustration.
Unpacking and Preparing for Installation Checking Computer Requirements Checking Computer Requirements To install an autoloader to work with your computer system, there are three requirements you need to check: n The computer system n SCSI capability n The software you will use to back up and restore files These are each covered below. Computer Requirements n HP 9000 Series 700, with HP-UX 10.01 or later n HP 9000 Series 800, with HP-UX 9.
Unpacking and Preparing for Installation Selecting a Site Selecting a Site You need to find a firm flat surface on which to place the autoloader. The site should satisfy the following conditions: n It should be situated away from doors or windows that open outside, to avoid sudden changes in temperature. n The environment should be reasonably free from dust and excessive humidity. Do not place the autoloader on the floor, near a door, near a heavily-travelled walkway, or near a laser printer.
2 Installing Your Autoloader This chapter describes how to install an HP A3716A autoloader.
Installing Your Autoloader Overview Overview The installation process consists of the following steps. They are described more fully beginning on page 2-4. 1 Shut down the operating system on the computer to which the autoloader is to be connected and power down the computer. 2 Check the autoloaders SCSI ID, and reset it if you want to change the default setting of 3. 3 Check the default autoloader option switch setting of 6. 4 Connect the SCSI cable.
Installing Your Autoloader The Rear Panel of the Autoloader The Rear Panel of the Autoloader Figure 2.1 shows the rear panel of the autoloader with a SCSI terminator fitted to SCSI connector 2. You only need to remove the terminator if the autoloader is between two other devices on the bus, or between another device and the host computer. Figure 2.
Installing Your Autoloader Installation on Series 700, 800 and 900 Systems Installation on Series 700, 800 and 900 Systems 1 Check and reset the SCSI ID if necessary. The SCSI ID of the autoloader is set to 3 at the factory. SCSI ID n Look at the rear panel of the autoloader and check that it is still set to 3. n You only need to change the SCSI ID if you already have a device on the bus with ID 3. Note Do not use SCSI ID 7, which is reserved for the SCSI controller.
Installing Your Autoloader Installation on Series 700, 800 and 900 Systems Figure 2.2 Configuration switches (shown in default positions) On On Off On On On On On This default setting is correct for HP systems. If you want to disable the Media Recognition System (see Choosing Cartridges on page 6-7), switch 3 should be ON. Note + Shut down the operating system and power off the computer system before removing or connecting any SCSI cables.
Installing Your Autoloader Configuring Software on Series 700 and 800 (HSC only) Systems Running HP-UX 10.01 or Later Configuring Software on Series 700 and 800 (HSC only) Systems Running HP-UX 10.01 or Later Configuring Drivers Using SAM To select the correct driver, proceed as follows. While in terminal version mode: 1 Run SAM. 2 Select Kernel Config. 3 Select Drivers. 4 Scroll to find schgr. 5 Check the current state: n in = OK. The driver is correctly configured. n out = Modification is needed.
Installing Your Autoloader Configuring Software on Series 700 and 800 (HSC only) Systems Running HP-UX 10.01 or Later 2 Select Create a New Kernel. Press [Return]. are you sure? Select yes. The message Creating kernel appears. The process takes one to two minutes to complete. 3 You must move the new kernel you have just created into place before the system is shut down or rebooted: Select Move Kernel into Place. Shut down or reboot the system and then select OK.
Installing Your Autoloader Configuring Software on Series 700 and 800 (HSC only) Systems Running HP-UX 10.01 or Later Verifying the Configuration Changer Mechanism Verification 1 Compile the scsi_io test program: cc /usr/contrib/src/scsi_io.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 10.01 or Later Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 10.01 or Later Checking the Revision of the Tape Driver 1 Verify the tape driver revision is equal to or later than the original version shown in the table that follows: what /stand/vmunix | grep tape14.c You should see something like this: tape14.c $Date: 96/05/23 14:44:31 $ $Revision: 1.10.89.8 $ PATCH_10.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 10.01 or Later Configuring the Pass-Through Driver Note These instructions are based on the HP-UX man page for scsi_pt (man 7 scsi_pt) and should only be used if you are installing the autoloader onto an NIO SCSI interface card. Please refer to this man page if you need more details about any aspect of the pass-through driver installation.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 10.01 or Later For example, using the previous ioscan display with the HP C1557A changer mechanism connected to hardware path 36.0.1, the line would read: driver 36.0.1 spt 6 Save the old system file: mv /stand/system /stand/system.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 10.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 10.01 or Later Verifying the Configuration Changer Mechanism Verification 1 Compile the scsi_io test program: cc /usr/contrib/src/scsi_io.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 9.04 Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 9.04 Checking the Revision of the Tape Driver 1 Log in to the target system as root. 2 Verify the correct driver is in the kernel: what /hp-ux | grep tape14.c If it is there, you should see: tape14.c $Date: 96/06/04 11:25:36 $ $Revision: 1.8.73.19 $ PATCH_9.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 9.04 f Press f4 Done. g Follow the standard directions for update. Update removes the original software to /system/PHKL_7643/orig. Keep this file to recover from any potential problems. You should move the .text file to /system/PHKL_7643 for future reference. 6 After the system reboots, repeat step 2 to verify that you have installed the patch correctly.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 9.04 Configuring the Pass-Through Driver Note These instructions are based on the HP-UX man page for scsi_pt (man 7 scsi_pt). Please refer to this man page if you need more details about any aspect of the pass-through driver installation. 1 Type ioscan -f to determine the hardware path and LU for the autoloader.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 9.04 to the C1557A changer mechanism in the autoloader. In this example, the changer mechanism is at the hardware path 0/28.0.1. The following line is an excerpt from the ioscan that describes the changer mechanism: unknown - 0/28.0.1 bus_converter.scsi1.target.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 9.04 The line should look like the following: Class LU H/W Path Driver H/W Status S/W S ==================================================================================== spt 0 0/28.0.1 bus_converter.scsi1.target.
Installing Your Autoloader Configuring Software on Series 800 HP-PB (NIO) Systems Running HP-UX 9.04 Verifying the Configuration Changer Mechanism Verification 1 Compile the scsi_io test program: cc /etc/contrib/bin/scsi_io.
Installing Your Autoloader Configuring Software on Series 900 Systems Running MPE/iX Version 5.5 Power Patch 1 or Later Configuring Software on Series 900 Systems Running MPE/iX Version 5.5 Power Patch 1 or Later Configuring Drivers Using SAM To select the correct driver, proceed as follows. While in terminal version mode: 1 Run SAM. 2 Select Kernel Config. 3 Select Drivers. 4 Scroll to find schgr. 5 Check the current state: n in = OK. The driver is correctly configured. n out = Modification is needed.
Installing Your Autoloader Configuring Software on Series 900 Systems Running MPE/iX Version 5.5 Power Patch 1 or Later 2 Select Create a New Kernel. Press [Return]. are you sure? Select yes. The message Creating kernel appears. The process takes one to two minutes to complete. 3 You must move the new kernel you have just created into place before the system is shut down or rebooted: Select Move Kernel into Place. Shut down or reboot the system and then select OK.
Installing Your Autoloader Configuring Software on Series 900 Systems Running MPE/iX Version 5.5 Power Patch 1 or Later c Save the configuration: io>HOLD d Exit the IO configurator: io>EXIT sysgen> e Save the changes in the permanent file: sysgen>KEEP f Save the changes made in the IO configurator to the default configuration group. Respond with Y when SYSGEN asks whether you want to overwrite this group. Create a System Load Tape (SLT) This procedure is optional, but recommended.
Installing Your Autoloader What Next? Various messages showing the model number and firmware revision should briefly appear, then the autoloaders self-test starts. All three front panel lights flash and the message Self Test shows. n At the end, if the test is successful, the pattern of lights and the message displayed depend on whether a magazine was in the autoloader and whether a cartridge was loaded in the drive mechanism.
Installing Your Autoloader What Next? 2-24
Part 2 Use and Care Instructions Chapter 3: Using the Autoloader Chapter 4: Front Panel Messages Chapter 5: Backup Strategies Chapter 6: Care of the Autoloader and Cartridges Chapter 7: Upgrading the Firmware Chapter 8: Troubleshooting
Use and Care Instructions Part 2-26
3 Using Your Autoloader This chapter describes the front panel and tells you how to load and unload tape cartridges and the magazine.
Using Your Autoloader Switching on the Autoloader Switching on the Autoloader Switch the autoloader on using the ON/OFF switch on the rear panel. The power indicator on the front panel lights when the drive is switched on. ON/OFF switch The autoloader now performs a self-test routine. This is shown by all three front panel lights flashing and the message Self Test showing. If the self-test fails, the Operator Attention Required (bottom) light changes to steady amber and the other lights go off.
Using Your Autoloader Front Panel Front panel display Front Panel Display The display shows status information about the autoloader in each of its five regions (see figure 3.2). Note that this exact display can never occur; all sections are showing at the same time so that you can see where they are. Figure 3.2 Front panel display 1 The ten-character dot matrix display provides information on the autoloaders operating status and potential error conditions.
Using Your Autoloader Front Panel Operator Attention Required Light (bottom) This light shows amber to indicate warning conditions: On A serious hardware error has occurred. Flashing An error has occurred for which you can take corrective action. These errors are shown in the following table. Slow flashing is once per second, medium is twice, and fast is four times per second.
Using Your Autoloader Loading a Magazine and Cartridges Loading a Magazine and Cartridges Note See Chapter 6 for details of choosing and using suitable cartridges. 1 Place the required number of cartridges into the magazine so that they point towards the center of the magazine. Figure 3.3 Loading a cartridge into the magazine Slot 4 Slot 5 Slot 6 Slot 1 Slot 2 Slot 3 Note the arrowhead indicating the direction of insertion Figure 3.3 shows the correct orientation of the cartridges.
Using Your Autoloader Loading a Magazine and Cartridges Figure 3.4 Inserting the magazine in the autoloader Note the arrowhead indicating the direction of insertion 3 Apply steady, gentle pressure until the mechanism takes the magazine and pulls it into the autoloader. The autoloader will then check which magazine slots contain cartridges.
Using Your Autoloader Ejecting the Magazine and Cartridges Depending on whether the host computer instructed the autoloader to load a cartridge or you pressed the Load Cartridge button, the autoloader goes into one of two modes of operation: random mode, where movement of cartridges is controlled by the backup software, or stacker mode, where cartridges are loaded in numerical order from the magazine. For more information, see Autoloader Modes of Operation on page 3-8.
Using Your Autoloader Autoloader Modes of Operation q To force ejection, hold the Eject button down for at least 5 seconds or press the Eject button three times within one minute. The autoloader responds as follows: a The front panel display will show Force Eject. b The autoloader waits 35 seconds to give the normal eject procedure a chance to occur.
Using Your Autoloader Autoloader Modes of Operation cartridge 1 so that it can restore the file. As a user, you may not even be aware that the cartridge has been changed. Use of random mode requires two things: n The host computer must be able to support multiple LUNs (Logical Unit Numbers), by which it identifies different devices at a single SCSI address, so that it can send commands separately to the changer mechanism and the DAT drive in the autoloader.
Using Your Autoloader Autoloader Modes of Operation 3-10
4 Front Panel Messages This chapter describes messages that can appear on the front panel display.
Front Panel Messages Message Categories Message Categories The messages that can be displayed on the front panel can be divided into three categories: Front panel display n Normal autoloader operating status messages n Error messages n Information messages These types are described below. All the messages are listed on page 4-3 in alphabetical order. The type of message is indicated by the letter S (Status), E (Error) or I (Informational) in the Type column.
Front Panel Messages Messages Messages The following list gives the messages that can be shown on the front panel display in alphabetical order.
Front Panel Messages Messages Message Type OAR Meaning Drive Comms Error E O The drive has stopped communicating with the changer mechanism. Action: See Chapter 8. Eject Fail E F An eject command has failed, either after you pressed the Eject button or after a host command. Action: Try forcing ejection (see page 3-7). If this fails, call customer support. Eject Mag I The Eject button has been pressed. Erase S The drive is erasing data from the tape.
Front Panel Messages Messages Message Type OAR Meaning Illegal FW E F The autoloader has failed to upgrade the drive firmware because the new firmware is incompatible. Action: Obtain a correct version of the firmware upgrade. Illegal HW E F The autoloader has failed to upgrade the drive firmware because the new firmware is for some other device. Action: Obtain a correct version of the firmware upgrade.
Front Panel Messages Messages Message Type OAR Meaning Read Only S See Ready xxm. Ready xxm S A cartridge has been loaded in the DDS drive, and the drive is ready for tape motion commands. xxm is the length of the currently loaded cartridge. For example, Ready 125m will be displayed when a DDS-3 (125m) cartridge is loaded. If a write-protected cartridge is loaded, the Ready xxm message alternates with a Read Only message.
Front Panel Messages Messages Message Type OAR Meaning Tape has DC data E O A READ command has encountered compressed data on the tape, and the drive is not currently configured to decompress data. The host may have disabled data compression, or configuration switch 2 (on the underside of the autoloader) may be off so the hosts ability to control the drives state is disabled. Action: Check that the host has not disabled data compression.
Front Panel Messages Messages 4-8
5 Choosing a Backup Strategy This chapter discusses the autoloaders modes of operation and backup strategies or routines to ensure that your data is backed up regularly.
Choosing a Backup Strategy Choice of Backup Strategy Choice of Backup Strategy Note It is highly recommended that you use the autoloader as described here, that is, one tape per day and one cleaning cartridge in a magazine. Using more tapes per day will cause lower reliability and reduce the autoloaders useful life. How you organize backup depends very much on how frequently your data changes, how extensive the changes are and how valuable you consider the information.
Choosing a Backup Strategy Choice of Backup Strategy last full backup. An incremental backup backs up new or modified files since the last full or incremental backup. Differential backups make locating a file to be restored easier but take up more space than incremental backups. n Consider archiving a magazine at intervals (perhaps quarterly) if there is a possibility you will need to retrieve historical data in future.
Choosing a Backup Strategy Choice of Backup Strategy 5-4
6 Care of Cartridges and Drive DDS drives require little care and maintenance. The two main activities are to clean the heads when needed and to avoid condensation and temperature extremes. This chapter describes precautions you should take to ensure the integrity of your backups.
Care of Cartridges and Drive Head Cleaning Head Cleaning Caution Use only an HP cleaning cartridge (part number 92283K) to clean the tape heads. Do not use swabs or other means of cleaning the heads. The autoloader contains a DDS-3 tape drive mechanism that requires cleaning less frequently than earlier DDS mechanisms. The following table gives guidelines for how often you should use a cleaning cartridge.
Care of Cartridges and Drive Head Cleaning To clean the heads in stacker mode: In stacker mode, you have control of when the heads are to be cleaned. Proceed as follows: 1 Place the cleaning cartridge in one of the magazine slots (such as slot 1). 2 Insert the magazine into the autoloader. 3 Use the Select button to select the slot in which you placed the cleaning cartridge. 4 Press the Load Cartridge button to load the cleaning cartridge into the drive.
Care of Cartridges and Drive Write-Protecting a Cartridge Write-Protecting a Cartridge If you want to protect the data on a cartridge from being altered or overwritten, you can write-protect the cartridge. To write-protect a cartridge, slide the tab on the rear of the cartridge so that the hole is open. In this state, data can be read from the tape but not written to it. Figure 6.
Care of Cartridges and Drive Temperature and Condensation Figure 6.2 Labeling a magazine Label area Temperature and Condensation Condensation can be a problem for tape drives, where a thin tape is passing across a rapidly spinning head. To minimize the chance of condensation, make sure the environment meets the requirements on page A-3.
Care of Cartridges and Drive Caring for Cartridges Caring for Cartridges Maximizing Tape Life We recommend that you use only Hewlett-Packard DDS Media Recognition System cartridges. These conform to HPs high standards for ensuring data integrity. Under optimum environmental conditions, Hewlett-Packard DDS cartridges are currently specified to 2000 passes over any part of the tape. In operational terms, this can be translated to 200300 backup operations.
Care of Cartridges and Drive Choosing Cartridges n Orientation: With the longest dimension vertical. This means a magazine should be stored on its side. n Temperature: Between 5°C (40°F) and 32°C (90°F). Wet bulb temperature should be less than 26°C (40°F). n Humidity: Between 26% RH and 60% RH. n Duration: Tests conducted by Sony Corporation for the DDS Manufacturers Group show that data can successfully be stored on DDS cartridges for up to 30 years.
Care of Cartridges and Drive Choosing Cartridges To identify data-grade tapes, look for the DDS logo on the cartridge shell. There are three variants, as shown in figure 6.3. Figure 6.3 DDS logos DDS-3 logo DDS-2 logo DDS-1 Media Recognition System logo The logo may be used by any media manufacturer whose tapes meet the DDS specification. Hewlett-Packard recommends that you use Hewlett-Packard DDS Media Recognition System cartridges with your DDS-format drive.
7 Upgrading Firmware by Cartridge This chapter tells you how to upgrade the autoloaders firmware electronically from a firmware upgrade cartridge.
Upgrading Firmware by Cartridge Upgrading the Firmware Upgrading the Firmware The HP A3716A allows you to upgrade its firmware by inserting a firmware upgrade cartridge. To do this, proceed as follows. The process will take at least 3 minutes to complete. Caution Do not disconnect power to the autoloader at any time during the upgrade, or it may result in the autoloader having corrupt firmware. 1 Ensure that the drive is not engaged in any SCSI activity (the Tape Activity light is off).
Upgrading Firmware by Cartridge Upgrading the Firmware Upgrade Problems Any problems with the upgrade will result in one of the following messages on the front panel display: Message Meaning FW Data Err The autoloader has failed to upgrade the drive firmware because the new firmware is corrupt. Action: Obtain a good copy of the firmware upgrade. FW Read Fail A firmware upgrade failed because of an error in reading data from the tape. Action: Try again. If it still fails, contact customer support.
Upgrading Firmware by Cartridge Upgrading the Firmware 7-4
8 Troubleshooting This chapter gives advice on what to do if you have problems with your autoloader or the backup process.
Troubleshooting Problems with Your Autoloader Problems with Your Autoloader The autoloader does not power up Make sure that the power cord is connected properly to the autoloader and to a working ac power socket. If the power is connected properly, the device has probably failed. Contact customer support. You cannot back up or restore 1 Check the front-panel display for any error messages (see Chapter 4). 2 Refer to the users manual for your backup software.
Troubleshooting Problems with Your Autoloader The environment in which the autoloader operates has changed q Has the autoloader been moved recently? q Has the environment changedunusually hot, cold, damp or dry? q Has there been dust or toner from a laser printer or photocopier near the autoloader? 1 Clean the drives tape heads with a cleaning cartridge and try the operation again. 2 Check the environmental conditions against the autoloaders specified limits.
Troubleshooting Common Questions and Answers Common Questions and Answers How often should I clean the drives tape heads? Refer to Head Cleaning on page 6-2. What should I avoid when positioning the autoloader? Do not place the autoloader in a dirty environment, for example on the floor, or near a door or walkway. Avoid locations subject to sudden temperature changes, such as near an outside door or window.
Part 3 Reference Appendix A: Product Specifications Appendix B: Ordering Information
Reference Part 3-6
Appendix A Product Specifications
Product Specifications Physical Specifications Physical Specifications Dimensions Height: 135 mm (5.3 in) Depth: 269 mm (10.6 in) Width: 165 mm (6.5 in) Weight 4.8 kg (10.
Product Specifications Environmental Specifications Environmental Specifications Autoloader Operating Limits Temperature: Humidity: Altitude: Vibration: Noise Level: 5°C to 40°C (41°F to 104°F) 20% to 80% RH, non-condensing Maximum wet bulb temperature 26°C (79°F) 0 to 4.6 km (0 to 15,000 ft) 0.5 g rms, 5500 Hz Less than 5.0 bel soundpower Autoloader Non-Operating Limits Temperature: Humidity: Altitude: Vibration: Shock Survival: −40°C to 70°C (−40°F to 158°F) 5% to 95% RH 0 to 15.
Product Specifications Safety and Electromagnetic Compatibility Safety and Electromagnetic Compatibility n n n n n n Appendix A-4 CSA Certification to C22.2, No.
Appendix B Ordering Information
Ordering Information Ordering Information Ordering Information The following HP products are recommended for use with your autoloader. They can be ordered from your HP dealer or sales office.
Glossary ANSI American National Standards Institute, which sets standards for SCSI and the safety of electrical devices, amongst other things. ATF Automatic Track Followinga method of ensuring the head is in the center of the track being read, used in HPs DDS-1 and DDS-2 drives. autoload When a tape cartridge is inserted, a tape drive with autoload will automatically load it, without the host having to send a load command.
DCLZ Data Compression Lempel-Ziv. A compression algorithm based on the Lempel-Ziv LZ2/LZW algorithms but with improved performance. DDS Digital Data Storage formats are industry-standard recording formats that build on the DAT format to support the storage of computer data. The first generation standard is DDS-1 (or simply DDS), to which was added data compression to produce the DDS-DC standard.
LZ Lempel-Ziv. A family of compression algorithms, all of which remove redundancy from data by encoding the data through a dictionary that is implicit in the compressed data. magazine A holder for up to six tape cartridges used in HP autoloaders. Media Recognition A method by which a drive can recognize data-grade cartridges. The tape System has a series of stripes on its transparent leader tape that the drive can identify.
SCSI Small Computer System Interface. A standard interface allowing many different kinds of device, such as disk drives, tape drives, CD-ROMs and others, to be accessed by the host computer. sequential mode Another name for stacker mode. stacker mode In stacker mode, cartridges are used sequentially from the autoloader magazine. The cartridge that you select, or by default, the cartridge in the lowest numbered slot in the magazine, is used first.
time-tracking A technique of ensuring that the read head stays in the center of the track that it is reading. The drive measures the time it takes to reach a particular point on the track, and if this time is less than or greater than its proper value, the drive adjusts the tape speed to compensate. In HP DDS-3 drives, time-tracking replaces the Automatic Track Following (ATF) used in DDS-1 and DDS-2 drives, and allows more of each track to be available for data storage.
Glossary-6
Index A ANSI Glos-1 archive life 6-7, 8-4 ATF Glos-1, Glos-5 autoload Glos-1 autoloader Glos-1 cannot back up or restore 8-2 does not power up 8-2 front panel 3-2 installation Ch.2 option switches 2-4 position 8-4 problems 8-3 rear panel 2-3 use Ch.3 B backup applications failure horizon strategies BIOS bit error rate BOD BOM BOP buttons Eject Load Cartridge Select 1-3 8-2 5-2 Ch.
M Q magazine Glos-3 labeling 6-4 part numbers B-2 Magazine Present light 3-3 maintenance Ch.6 Media Recognition System 6-7, Glos-3 disabling 2-5 logo 6-8 messages Ch.
Radio Frequency Interference Statement (Federal Communications Commission), USA only This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
Japanese VCCI Statement [This apparatus is Class 2 Information Technology Equipment, based on the rules of the Voluntary Control Council for INterference by Information Technology Equipment (VCCI). Although designed for use in residential areas, radio interference may be caused when used near a radio or TV receiver. Read the instructions for correct operation.
