CONTENTS Title Page Copyright Page Preface New and Changed Features 1 Introduction to the VAX Storage Library System 1.1 VAX SLS Software Product Description 1.1.1 VAX SLS Software Features 1.1.1.1 Who uses VAX SLS software 1.1.1.2 Backup management 1.1.1.3 Archive management 1.1.1.4 Volume management 1.1.1.5 Media management 1.1.1.6 Restore management 1.1.1.7 Authorization management 1.1.2 The VAX SLS Server and Client Processes 1.1.2.1 Purposes of the VAX SLS server and client processes 1.1.2.2 Basic block diagram of VAX SLS server and client processes 1.2 Storage Administration 1.2.1 Concepts and Principles of Storage Administration 1.2.1.1 Classes of data storage that affect availability 1.2.1.2 Definition: On-line storage 1.2.1.3 Definition: Near-line storage 1.2.1.4 Definition: Off-line storage 1.2.1.5 Why you save data 1.2.1.6 Backup copy of data 1.2.1.7 Archive copy of data 1.3 Responsibilities for the Storage Administrator, Operator, and User 1.3.1 The Storage Administrator's Responsibilities 1.3.1.1 Defining backup and archiving policy 1.3.1.2 Installing VAX SLS software 1.3.1.3 Configuring VAX SLS software 1.3.1.4 Policy implementation 1.3.1.5 Policy administration 1.3.2 The Operator's Responsibilities 1.3.3 The User's Responsibilities 1.4 Storage Management with VAX SLS Software 1.4.1 The Storage Administrator's Tasks 1.4.2 The Operator's Tasks 1.4.3 The User's Tasks 2 VAX SLS Interfaces 2.1 Types of Interfaces 2.1.1 VAX SLS Storage Administrator Menu 2.1.1.1 Description 2.1.1.2 How to access the VAX SLS Storage Administrator Menu 2.1.1.3 The VAX SLS Storage Administrator Menu 2.1.1.4 VAX SLS Storage Administrator Menu options 2.1.1.5 For more information 2.1.2 DCL STORAGE Command 2.1.2.1 Description 2.1.3 VAX SLS Storage Administrator Keypad Definitions 2.1.3.1 Description 2.1.3.2 The VAX SLS Storage Administrator Help screen 2.1.3.3 Keypad Definitions 2.2 Flat and Command File Editing 2.2.1 Flat Files for VAX SLS Operations 2.2.1.1 Flat file functions 2.2.2 Command Files for VAX SLS Operations 2.2.2.1 Command file functions 3 Configuring System for VAX SLS Software 3.1 VAX SLS Server and Client Processes 3.1.1 Detailed Description of VAX SLS Server and Client Processes 3.1.1.1 VAX SLS server and client process diagram 3.1.1.2 The VAX SLS server process in a VAXcluster system 3.1.1.3 How the active VAX SLS server is established 3.1.1.4 VAX SLS client and server process relationship 3.1.1.5 VAX SLS client and server connection 3.1.2 Example: Two Node VAXcluster Configuration 3.1.2.1 Two node VAX SLS software configuration 3.1.3 Example: Three Node Configuration 3.1.3.1 Three node VAX SLS software configuration 3.1.4 Example: Six Node Configuration 3.1.4.1 Six node VAX SLS software configuration 3.1.5 Configuring the VAX SLS Server and Client Processes 3.1.5.1 Identifying the VAX SLS server system 3.1.5.2 Identifying VAXcluster system members 3.1.5.3 The client/server process connection timeout value 3.2 VAX SLS Data Safety 3.2.1 Issues Affecting Data Safety 3.2.1.1 Requirement for data safety 3.2.1.2 Methods of ensuring VAX SLS data safety 3.2.1.3 Comparison of methods 3.2.2 Data Safety with the VMS Backup Utility 3.2.2.1 Important considerations 3.2.2.2 If your VAX SLS volume database device fails 3.2.2.3 VAX SLS system history file device failure 3.2.3 Data Safety with VAX RMS Journaling and the VMS Backup Utility 3.2.3.1 Important considerations 3.2.3.2 How to implement the VMS Backup utility with VAX RMS Journaling 3.2.3.3 If your VAX SLS volume database device fails 3.2.3.4 If your VAX RMS Journal device fails 3.2.3.5 How to manually update the VAX SLS system history files 3.2.4 Data Safety with VAX Volume Shadowing 3.2.4.1 VAX Volume Shadowing 3.2.5 Configuring the VAX SLS Volume Database Location 3.2.5.1 Defining the VAX SLS volume database location 3.2.6 Managing VAX SLS System History Files 3.2.6.1 Purpose for VAX SLS system history files 3.2.6.2 VAX SLS system history file sets 3.2.6.3 Creating VAX SLS system history files for system backups 3.2.6.4 If you do not want VAX SLS system history files 3.2.6.5 Naming your VAX SLS system history file sets 3.2.6.6 Defining VAX SLS system history file set directories 3.2.6.7 Rules for VAX SLS system history names and directories 3.2.6.8 Example VAX SLS system history file assignments 3.2.6.9 Characterizing VAX SLS system history files 3.3 Configuring for Additional VAX SLS Software Computing Resources 3.3.1 Additional Computing Resource Control 3.3.1.1 Caution: Do NOT change the NODE assignment 3.3.1.2 The VAX SLS batch queue 3.3.1.3 VAX SLS process priority 3.4 Configuring for Operator Communication 3.4.1 Operator Communication 3.4.1.1 How to ensure VMS OPCOM is is running 3.4.1.2 Escape sequence assignment restrictions 3.4.1.3 CRLF and ESC symbol supplied assignments 3.4.1.4 Supplied symbol values for load request messages 3.4.1.5 Supplied symbol values for drive allocation messages 3.4.1.6 Supplied symbol values for tape label and ring verify messages 3.4.2 Communicating Events to the Operator 3.4.2.1 Operator classes to receive load requests 3.4.2.2 Controlling Operator Action for Loading Volumes 3.4.2.3 Assigning a value to the QUICKLOAD symbol 3.4.2.4 Batch job start and stop notification 3.5 VAX SLS Software Device Management 3.5.1 Enabling VAX SLS Software Control of Devices 3.5.1.1 Using the ALLDEV symbol to control drive allocation 3.5.1.2 Allocating drives to VAX SLS software 3.5.1.3 ALLDEV assignment values 3.5.1.4 Enabling users to allocate drives without operator intervention 3.5.1.5 SELDEV assignment values 3.5.1.6 Accessing a volume on an ALLDEV device 3.5.1.7 Gaining access to an ALLDEV device 3.5.1.8 Setting the interval to check for FREE drives 3.5.2 Configuring VAX SLS Software for the RV64 Jukebox Subsystem 3.5.2.1 VAX SLS software support 3.5.2.2 RV64 Jukebox Subsystem Description 3.5.2.3 Operator interaction with the RV64 Jukebox Subsystem 3.5.2.4 Software interaction with the RV64 Jukebox Subsystem 3.5.2.5 Naming your default jukebox 3.5.2.6 VAX SLS software control of RV64 drives 3.5.2.7 Example assignment from TAPESTART.COM 3.5.2.8 Naming requirement for jukeboxes 3.5.2.9 The purpose of allocating jukebox slots 3.5.2.10 Allocating jukebox slots for VAX SLS software 3.5.2.11 Example assignment from TAPESTART.COM 3.6 VAX SLS Data Maintenance 3.6.1 VAX SLS Software Data Maintenance Features 3.6.1.1 What the CLEANUP process does 3.6.1.2 Cleaning VAX SLS system history files 3.6.1.3 The SYSCLN and CLEANUP relationship 3.6.1.4 Controlling the cleanup process 3.6.1.5 CLEANUP_Q supplied value 3.6.1.6 Setting the days and durations for cleaning VAX SLS history files 3.6.1.7 SYSCLN_RUN and CLEANUP_Q assignment examples 3.6.2 Optimizing VAX SLS Data Files 3.6.2.1 Recommended minimum optimization 3.6.2.2 Using the FDL to optimize your files 3.6.2.3 How to optimize files with the FDL 3.7 Supporting User and Operator Data Saving Operations 3.7.1 Supporting VAX SLS STORAGE SAVE and Save Screen Operations 3.7.1.1 Specifying the backup format 3.7.1.2 Backing up with the BACKUP format 3.7.1.3 Backing up with the ASCII format 3.7.1.4 Backing up with the EBCDIC format 3.7.1.5 Restrictions imposed by the ASCII and EBCDIC formats 3.7.1.6 Operator Save Screen option defaults 3.7.1.7 Setting the Operator Save Screen defaults 3.7.1.8 Setting the default volume allocation for user saves 3.7.1.9 Defining the backup batch queue name 3.7.1.10 Notification when backups are finished 3.7.1.11 Supplying default volume size for STORAGE SAVE 3.7.2 Planning for VAX SLS User History Files 3.7.2.1 Location for VAX SLS user history files 3.7.2.2 How to determine the VAX SLS user history file location 3.8 Starting VAX SLS Software Operations 3.8.1 Making the VMS System Ready for VAX SLS Software 3.8.1.1 Where to find the on-line release notes 3.8.1.2 What to add to the system startup file 3.8.1.3 What to add to the system login file 3.8.1.4 Setting VAX SLS software user account quotas 4 VAX SLS Software Authorization Management 4.1 Controlling Access to the VAX SLS Volume Database 4.1.1 Controlling Database Access Authorization 4.1.1.1 Introduction 4.1.1.2 VAX SLS Volume Database Access Authorization screen 4.1.1.3 Database Access Authorization screen fields 4.1.1.4 How to allow client node access to the database 4.1.1.5 How to find a node name in the Database Access Authorization screen 4.1.1.6 How to edit a node name in the Database Access Authorization screen 4.1.1.7 How to delete a node name in the Database Access Authorization screen 4.2 Controlling Access to Volume Pools 4.2.1 Controlling Volume Pool Authorization 4.2.1.1 VAX SLS Volume Pool Authorization screen 4.2.1.2 Volume Pool Authorization screen fields 4.2.1.3 How to allow users access to volume pools 4.2.1.4 How to find a user entry in the Volume Pool Authorization screen 4.2.1.5 How to edit a user entry in the Volume Pool Authorization screen 4.2.1.6 How to delete a user entry in the Volume Pool Authorization screen 4.3 Granting Privileges for Volume Database Operations 4.3.1 Volume Management Privileges 4.3.1.1 Volume management privileges for function authorization 4.3.1.2 Volume database fields that require PRIV_MODANY to modify 4.3.1.3 PRIV_MODOWN rules 4.3.1.4 Volume management privilege assignment example 4.3.1.5 Volume management privileges supplied assignments 5 Media Management with VAX SLS Software 5.1 General Media Management 5.1.1 Media type definition and device allocation 5.1.1.1 Guidelines for media type assignments 5.1.1.2 Supplied magnetic tape and optical disk media types 5.1.1.3 Examples 5.1.2 TA90 Magnetic Tape Subsystem Data Compaction Control 5.1.2.1 Defining TA90K and TA90E media types 5.1.2.2 Media type to support only TA90 drives 5.1.2.3 Media types to support both TA90 and TA90E drives 5.1.2.4 Media types to support only TA90E drives 6 Volume Management with VAX SLS Software 6.1 Introduction 6.1.1 Definitions 6.1.1.1 Definition: Volume 6.1.1.2 Definition: Volume ID 6.1.1.3 Definition: Slot 6.1.1.4 Definition: Volume set 6.1.1.5 Definition: Volume pool 6.1.2 Volume States 6.1.2.1 Purpose of volume states 6.1.2.2 Example: Volume state cycling 6.1.2.3 Volume state assignments and meanings 6.1.2.4 Scratch date importance 6.1.2.5 Changing a volume state 6.1.2.6 Definition: Volume retention period 6.1.2.7 Determining the state of freed volumes 6.1.2.8 How volume states are determined 6.1.2.9 Users changing scratch dates 6.1.2.10 When to remove volumes from the database 6.1.3 Single-Sided and Double-Sided Media 6.1.3.1 Definition: Single-sided and double-sided media 6.1.3.2 Description of the RV02K optical cartridge 6.1.3.3 Initialization rules for the RV02K optical cartridge 6.1.3.4 Allocation recommendation 6.1.3.5 Adding double-sided volumes 6.1.4 Offsite Vault Storage of Volumes 6.1.4.1 Purpose: Offsite vault storage 6.1.4.2 Methods of volume transfers 6.2 Managing Volumes with VAX SLS Software 6.2.1 Default Location, Identification, and Protection 6.2.1.1 Defining the volume location default value 6.2.1.2 LOC symbol assignments example 6.2.1.3 Off-Site vault specification 6.2.1.4 Defining the file to write volume printed labels 6.2.1.5 Defining the volume protection default 6.2.1.6 How to define the hexadecimal protection codes 6.2.1.7 Defining the allocation volume size default 6.2.2 Volume Availability Management 6.2.2.1 Defining the default volume scratch time for allocation 6.2.2.2 Defining default volume scratch time for STORAGE SAVE 6.2.2.3 Defining the maximum user-set scratch date 6.2.2.4 Scratch date notification 6.2.2.5 Enabling user notification of volume scratch date 6.2.2.6 Notifying users when a volume reaches its scratch date 6.2.2.7 Defining the state of scratched volumes 6.2.2.8 Defining the transition time of volumes 6.2.3 Accounting for Volume Usage 6.2.3.1 The volume usage report 6.2.3.2 Volume accounting period 6.2.3.3 Customizing your volume usage report 6.2.3.4 How to produce a volume usage report on demand 6.3 Off-Site Vault Management 6.3.1 Scheduling Vault Transfers with VAX SLS Software 6.3.1.1 Making vault dates available 6.3.1.2 Two methods for specifying vault dates 6.3.2 Scheduling Vault Dates 6.3.2.1 Method 1: Explicit schedule 6.3.2.2 Method 2: Daily or weekly schedule 7 Managing System Backup Operations 7.1 Introduction to System Backup Operations 7.1.1 What is a System Backup? 7.1.1.1 VAX SLS system backups 7.1.1.2 VAX SLS software features that support system backups 7.1.1.3 Two methods of creating backup command files 7.1.1.4 System backups by the storage administrator 7.1.2 How System Backups are Executed 7.1.2.1 Running manual backups 7.1.2.2 Running automatically scheduled backups 7.2 Preparing for System Backups 7.2.1 Defining Characteristics of VAX SLS System History Sets 7.2.1.1 The file for characterizing VAX SLS system history sets 7.2.1.2 Determining the space required for VAX SLS system histories 7.2.1.3 History records for individual file versions 7.2.1.4 Declaring the maximum file name size 7.2.1.5 Declaring the maximum number of VAX SLS system history pointers per file 7.2.1.6 Choosing to store the node name in the Files file 7.2.2 Skipping Automatic System Backups on Holidays 7.2.2.1 The purpose of HOLIDAYS.DAT 7.2.2.2 HOLIDAYS.DAT record 7.2.2.3 HOLIDAYS.DAT example 7.3 Implementing Your System Backup Policy 7.3.1 Overview of System Backup Command Files 7.3.1.1 Requirements for system backup command files 7.3.1.2 Conventions for system backup command files 7.3.1.3 System backup functional considerations 7.3.2 System Backup Control 7.3.2.1 Symbols for automatic scheduling 7.3.2.2 Automatic scheduling for holidays 7.3.2.3 Specifying the days for your backup to run 7.3.2.4 Specifying the time of day for your backup to run 7.3.2.5 Overriding the default queue with the time definition 7.3.2.6 Specifying the node that submits the backup 7.3.2.7 Specifying the node on a VAXcluster system 7.3.2.8 Specifying the node on a standalone system 7.3.2.9 Example of automatic scheduling selection 7.3.2.10 Skipping an automatic backup 7.3.2.11 Enabling special processing for your backup 7.3.2.12 Preprocessing and post-processing operations 7.3.2.13 Symbols enabled for preprocessing and post-processing 7.3.2.14 Executing another batch job after the backup 7.3.2.15 Purpose of the summary file 7.3.2.16 Allowable SUMMARY_FILE values 7.3.3 System Backup Type 7.3.3.1 The backup operation 7.3.3.2 Defining the backup privilege 7.3.3.3 Selecting the files to be backed up 7.3.3.4 Defining the type of backup 7.3.3.5 Qualifiers that should not be used 7.3.3.6 Recommended options for the QUALIFIERS symbol 7.3.3.7 Examples of defining backup types 7.3.3.8 Assigning values to MNTFLAGS 7.3.3.9 Assigning additional mount actions 7.3.3.10 VAX SLS symbols for creating save set names 7.3.3.11 Save set name creation symbol descriptions 7.3.3.12 Save set name length restrictions 7.3.3.13 How to implement save set name generation 7.3.3.14 Assigning file protection values 7.3.4 System Backup Volume Characteristics 7.3.4.1 Indicating the type of media to be used for the backup 7.3.4.2 Assigning backup volume density 7.3.4.3 Identifying the backup volume size 7.3.4.4 Choosing the volume pool for the backup 7.3.5 System Backup Operator Intervention Policy 7.3.5.1 Example: Attended system backup assignments with restrictions 7.3.5.2 Example: Attended system backup assignments with no operator restrictions 7.3.5.3 Example: Unattended system backup assignments 7.3.5.4 Acknowledging loaded volumes 7.3.5.5 Allocating volumes prior to running the backup 7.3.5.6 Enabling VAX SLS software to automatically select volumes 7.3.5.7 Allowable values for AUTOSEL 7.3.5.8 Recommended procedure for handling volumes 7.3.5.9 Handling volume label mismatches during the backup 7.3.5.10 Allowable CONTLOADOPT values 7.3.6 System Backup Resource Allocation 7.3.6.1 Considerations for more than one backup on one volume 7.3.6.2 Assigning values to CONTINUE 7.3.7 System Backup Volume Disposition 7.3.7.1 Specifying symbols for VAX SLS system history files 7.3.7.2 Naming your VAX SLS system history set 7.3.7.3 Naming the VAX SLS system history processing queue 7.3.7.4 Setting the number of days for volume retention 7.3.7.5 Setting volume off-site and on-site dates 7.3.7.6 Allowable OFFSITE_DATE and ONSITE_DATE values 7.3.7.7 Printing volume labels 7.3.7.8 Allowable assignments to TAPE_LABELS 7.3.7.9 Assigning a note to your backup volume 7.3.8 System Backup Device Control 7.3.8.1 Assigning the backup device 7.3.8.2 Controlling the number of drives to be used for the backup 7.3.8.3 How VAX SLS software implements N_DRIVES during a system backup 7.3.9 System Backup Status and Information Reporting 7.3.9.1 Enabling operator replies on backup progress 7.3.9.2 Controlling DCL REPLY messages 7.3.9.3 Reporting backup status by mail 7.3.9.4 Naming your backup log file 7.3.9.5 Creating your listing file name 7.3.9.6 Controlling listing file format 7.3.9.7 Printing your listing file 7.4 Unattended System Backups 7.4.1 Unattended System Backups 7.4.1.1 Restrictions for conducting unattended backups 7.4.1.2 How an unattended backup works 7.4.1.3 How to prepare for an unattended system backup 8 Archiving Data with VAX SLS Software 8.1 Automatic Archiving 8.1.1 Preparing for Automatic Archiving 8.1.1.1 Preparation for automatic archiving 8.1.2 Setting File Retention and Expiration Times 8.1.2.1 Definition: File retention time 8.1.2.2 How the file retention time works 8.1.2.3 A graphic look at file retention times 8.1.2.4 Special cases of file access 8.1.2.5 Rules for applying the file retention time with SET VOLUME 8.1.2.6 How to set the file retention time 8.1.2.7 Example of setting file retention 8.1.2.8 How to set expiration times for files 8.1.2.9 How to determine a file's expiration date 8.1.3 Controlling Automatic Archiving 8.1.3.1 When not to tailor ARCHIVE_SBK 8.1.3.2 Automatic archiving symbols 8.1.3.3 For detailed descriptions of ARCHIVE_SBK symbols 8.2 Standby Archiving 8.2.1 Introduction to Standby Archiving 8.2.1.1 The standby archiving process 8.2.1.2 Implementing standby archiving 8.2.2 Editing TAPESTART.COM for Standby Archiving 8.2.2.1 Defining standby archiving log file location 8.2.2.2 Setting the standby archiving interval 8.2.2.3 Defining the default archiving class 8.2.2.4 Alternate methods for defining the default class 8.2.3 Archive Class Creation and User Access 8.2.3.1 Establishing archive classes and enabling user access to them 8.2.3.2 Example B1C.TEMPLATE file 8.2.3.3 Archive class naming conventions 8.2.4 Starting and Stopping the Standby Archiving Process 8.2.4.1 The Standby Archive option of the VAX SLS Operator Menu 8.2.4.2 Starting standby archiving with the STORAGE STARTUP command 9 Managing Data Restoration 9.1 Restoring Data with VAX SLS Software 9.1.1 Managing Data Restoration 9.1.1.1 Defining the restore operation queue 9.1.1.2 Operator Restore Screen option defaults 9.1.1.3 Setting Operator Restore Screen option defaults 9.1.1.4 Notification when restores are finished A TAPESTART.COM Quick Reference A.1 TAPESTART.COM Symbols for Configuration A.2 TAPESTART.COM Symbols for Authorization A.3 TAPESTART.COM Symbols for Media Management A.4 TAPESTART.COM Symbols for Volume Management A.5 TAPESTART.COM Symbols for Standby Archiving A.6 TAPESTART.COM Symbols for Restore Operations B System Backup Command File Quick Reference B.1 System Backup Symbols for Control B.2 System Backup Symbols for Type B.3 System Backup Symbols for Volume Characteristics B.4 System Backup Symbols for Operator Intervention B.5 System Backup Symbols for Resource Allocation B.6 System Backup Symbols for Volume Disposition B.7 System Backup Symbols for Device Control B.8 System Backup Symbols for Status and Information C How to Define Automatic Scheduling Days C.1 Introduction C.1.1 Specifying a Day of the Week C.1.1.1 Day of the week assignment C.1.1.2 Example day of the week assignments C.1.2 Specifying a Day Offset into a Month C.1.2.1 Days offset assignment C.1.2.2 Example offset day assignments C.1.3 Specifying a Week Offset into a Month C.1.3.1 Weeks offset assignment C.1.3.2 Example week offset assignments: C.1.3.3 Specifying a day offset from a week offset D System Messages D.1 About This Appendix D.2 Message Format D.3 Success Messages D.4 Informational Messages D.5 Warning Messages D.6 Error Messages D.7 Fatal Messages Glossary G.1 About This Glossary FIGURES 1-1 VAX SLS Server and Client Processes 3-1 VAX SLS Full Function Software 3-2 Two Node VAX SLS Software Configuration 3-3 Three Node VAX SLS Software Configuration 3-4 Six Node VAX SLS Software Configuration 8-1 File Retention Times TABLES 3-1 Comparison of VAX SLS Data Safety Methods 3-2 How to Restore the VAX SLS Volume Database From a Backup Copy 3-3 How to Restore the VAX SLS System History Files From a Backup Copy 3-4 How to Implement the VMS Backup Utility with VAX RMS Journaling 3-5 How to Restore the VAX SLS Volume Database from a VAX RMS Journal File 3-6 How to Respond to a VAX RMS Journal Device Failure 3-7 How to Manually Update VAX SLS System History Files 3-8 How to Ensure VMS OPCOM is Running 3-9 How to Optimize a VAX SLS Data File 3-10 How to set VAX SLS user account quotas 4-1 How to Allow Client Node Access to the Database 4-2 How to Find a Node Entry in the Database Access Authorization Screen 4-3 How to Edit a Node Entry in the Database Access Authorization Screen 4-4 How to Delete a Node Name Entry in the Database Access Authorization Screen 4-5 How to Allow Users Access to Volume Pools 4-6 How to Find a User Entry in the Volume Pool Authorization Screen 4-7 How to Edit a User Entry in the Volume Pool Authorization Screen 4-8 How to Delete a User Entry in the Volume Pool Authorization Screen 6-1 How to Define the Hexadecimal Protection Code 6-2 Customizing Your Volume Usage Report 6-3 How to Establish a Daily or Weekly Vault Schedule 7-1 How to generate save set names 7-2 How to Handle System Backup Volumes 7-3 How to Prepare for Unattended System Backups A-1 TAPESTART.COM Symbols for Configuration A-2 TAPESTART.COM Symbols for Authorization A-3 TAPESTART.COM Symbols for Media Management A-4 TAPESTART.COM Symbols for Volume Management A-5 TAPESTART.COM Symbols for Volume Management A-6 TAPESTART.COM Symbols for Volume Management B-1 System Backup Symbols for Control B-2 System Backup Symbols for Type B-3 System Backup Symbols for Volume Characteristics B-4 System Backup Symbols for Operator Intervention B-5 System Backup Symbols for Resource Allocation B-6 System Backup Symbols for Volume Disposition B-7 System Backup Symbols for Device Control B-8 System Backup Symbols for Status and Information D-1 Location of Message Descriptions