DSM/Tape Catalog Operator Interface (MEDIACOM) Manual

MEDIACOM Commands

DSM/Tape Catalog Operator Interface (MEDIACOM) Manual—429828-010

2-42

ALTER MEDIADEFS Command (Super Group or

SECURITY-MEDIA-ADMIN Only)

PERMANENT

keeps the entry until it is erased with DELETE TAPEFILE. A permanent entry

can subsequently be given an expiration date with ALTER TAPEFILE, in which

case it remains in the catalog until it expires.

RESET ABENDRETENTION

changes the current ABENDRETENTION value to 1.

AUTOMATED { ON | OFF }

determines how many times an attempt is made to automatically select and mount

from DSM/TC or TMF, a scratch tape on an ACS tape drive. This option’s value is

used when the AUTOMATED attribute is not used in a TAPECATALOG DEFINE.

For more information on this option, see Considerations on page 2-44.

$ZSVR requests DSM/TC a total of ten times to select an ACS scratch tape to

satisfy a mount message.

OFF

$ZSVR requests DSM/TC only one time to select an ACS scratch tape to

satisfy a mount message. The default is OFF.

RESET AUTOMATED

changes the current AUTOMATED value to OFF.

COMPRESSION { IDRC | ON | OFF }

determines whether compression is used when writing data to a tape. This option’s

value is used when the COMPRESSION attribute is not used in a TAPECATALOG

DEFINE.

IDRC

uses compression when writing the data.

OFF

does not use compression when writing the data. The default is OFF.

Note. Compression is sometimes used even when you specify COMPRESSION OFF.

For example, writing compressed data on tape is the only mode of the 5194 tape

drive, which means the tape drive compresses data whenever possible.