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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:

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:

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:

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.

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 User Manual

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