HP BACKCOPY User Manual

The completion information returned by DCOM includes these fields:
DescriptionField
An integer that describes how DCOM terminated (see Table 12)completioncode
An integer that describes the nature of errors or warnings (see Table 12)terminationinfo
Contains the DCOM subsystem ID, TANDEM.32.release, where release is the
release version of DCOM (D42, for example)
subsystem
A character string describing the code in terminationinfo (see Table 12)text
The number of characters in texttextlength
Table 12 DCOM Completion Codes
DescriptionCode
A normal, voluntary termination of DCOM with no errors or warnings.0
A normal, voluntary termination of DCOM with warnings. Disk compression completed, but DCOM
reported disk structure diagnostics, space allocation problems, or a nonfatal internal program error.
DCOM includes this termination information with the completion code:
1
TextTerminationinfo
Disk structure anomalies or I/O errors1
Internal program error2
An abnormal, voluntary termination with errors. DCOM performed partial compression, but a disk error
or an internal error prevented full compression. DCOM includes this termination information with the
completion code:
2
TextTerminationinfo
Disk structure anomalies or I/O errors1
Internal program error2
An abnormal, voluntary termination with fatal errors. DCOM did not compress the disk because of severe
disk errors, severe structural errors, a fatal program error, or an invalid user command. DCOM includes
this termination information with the completion code:
3
TextTerminationinfo
Disk structure anomalies or I/O errors1
Internal program error2
Command syntax or parameter error3
DCOM never started, so the completion code is generated by the TACL process executing DCOM. The
terminationinfo field holds an error code from the process creation procedure.
4
DCOM ended abnormally and returned 0 in the terminationinfo field.5
Guidelines
Consider these suggestions and guidelines while running DCOM:
• DCOM compresses a disk even while that disk is in service. When DCOM is executing, there
are three visible effects:
◦ DCOM must have exclusive access to the file whose extents it is moving. Do not run
DCOM if an important operation will fail when it takes exclusive possession of a file.
86 Disk Compression (DCOM)

HP BACKCOPY Specifications

General

Brand	HP
Model	BACKCOPY
Category	Software
Language	English

Summary

Abstract

What’s New in This Manual

Manual Information

Information about the manual's version, history, and product details.

New and Changed Information

Lists specific revisions made in different manual versions.

About This Manual

Audience

Describes the intended readers and their required familiarity.

Organization

Explains the manual's structure by chapters and appendices.

Related Documentation

Notation Conventions

General Syntax Notation

Defines conventions used for command syntax presentation.

Disk and Tape Utilities Overview

Utility Descriptions

Briefly describes each utility and its associated tasks.

Using BACKCOPY, BACKUP, and RESTORE

Explains common procedures and differences between these utilities.

BACKCOPY

Security

Discusses access control and security for the BACKCOPY utility.

BACKCOPY Syntax

Describes the command structure and available options.

BACKUP

Security

Discusses access control and security for the BACKUP utility.

BACKUP and RESTORE Interaction

Explains how BACKUP options affect RESTORE operations.

BACKUP Syntax

Details the command structure for file and volume modes.

Disk Compression (DCOM)

Security

Discusses access control and security for the DCOM utility.

DCOM Syntax

Describes the command structure and available options.

Disk Space Analysis Program (DSAP)

Security

Discusses access control and security for the DSAP utility.

DSAP Syntax

Describes the command structure and available options.

DSAP Options

Lists and describes various DSAP analysis options.

PAK/UNPAK

PAK Command Options

Details the options available for the PAK command.

UNPAK Command Options

Details the options available for the UNPAK command.

RESTORE

Security

Discusses access control and security for the RESTORE utility.

RESTORE Syntax

Details command structure for file and volume modes.

RESTORE Options

Detailed explanation of individual RESTORE options.

BACKCOPY, BACKUP, and RESTORE Messages

DCOM/DSAP Messages

PAK/UNPAK Messages

Syntax Summaries

BACKCOPY Syntax

Summarizes the syntax for the BACKCOPY command.

BACKUP File-Mode Syntax

Summarizes the syntax for BACKUP in file mode.

BACKUP Volume-Mode Syntax

Summarizes the syntax for BACKUP in volume mode.

DCOM Syntax

Summarizes the syntax for the DCOM command.

DSAP Syntax

Summarizes the syntax for the DSAP command.

PAK/UNPAK Syntax

Summarizes the syntax for PAK and UNPAK commands.

RESTORE File-Mode Syntax

Summarizes the syntax for RESTORE in file mode.

RESTORE Volume-Mode Syntax

Summarizes the syntax for RESTORE in volume mode.

CLASS TAPE DEFINEs

TAPE DEFINE Attributes

Lists and describes the attributes for TAPE DEFINEs.

TAPE DEFINE Consistency Checks

Details consistency rules for TAPE DEFINE attributes.

Tape Label Formats

ANSI Standard Labels

Describes ANSI VOL1 and HDR1/EOF/EOV1 label formats.

IBM Standard Labels

Describes IBM VOL1, HDR1/EOF1/EOV1, HDR2/EOF2/EOV2 label formats.