DSM/Tape Catalog Operator Interface (MEDIACOM) Manual

MEDIACOM Commands
DSM/Tape Catalog Operator Interface (MEDIACOM) Manual—429828-010
2-48
ALTER MEDIADEFS Command (Super Group or
SECURITY-MEDIA-ADMIN Only)

TMF and DSM/TC
If your site uses TMF, it functions as usual after DSM/TC is installed. However,
TMF does not work at the lowest tape support level (UNLABELED). It works at
tape support levels NOCATALOG, COMPATIBLE, and MEDIACAT.

System clock problems
Each time the clean-up process runs, whether at its scheduled time or by using
EXPIRE TAPEFILE, the process compares its last run date to the clock on the
node where it is running. If more than three days have elapsed between the last
run date and the system time, an error condition flag is set in the DSM/TC system
to prevent the clean-up process from running until the problem is resolved. An
error message is also sent to the Event Messages System log. This error message
is also displayed by an INFO MEDIADEFS command.
If the system time is wrong, correct it with the operating system’s SET TIME
command. Then issue ALTER MEDIADEFS with the RESET EXPIRATION option
to change the error condition flag to permit the clean-up process to run, either at
the next scheduled time or by using EXPIRE TAPEFILE. If the system time does
not need correcting, just issue ALTER MEDIADEFS with the RESET EXPIRATION
option to confirm that the time is right and to clear the error condition flag.
Examples
All these examples are for a DSM/TC system that includes three nodes: \SKY, \SEA,
and \STAR. There is a file catalog on each node and one volume catalog for all three
nodes on \SKY. \SKY is also the current default node in the examples.

As soon as DSM/TC is installed on the last node, issue these commands to
establish the system defaults for each node. Because you are in the process of
converting to DSM/TC for the next two months, set the tape support level to
compatible.
MC> ALTER MEDIADEFS,&
>>> SSLIST (\SKY, \SEA, \STAR),&
>>> FILECAT FILE_CATALOG_SKY,&
>>> VOLCAT MASTER_TAPE_CATALOG,&
>>> POOL TAPES_FOR_SKY,&
>>> LEVEL COMPATIBLE,&
>>> RETENTION 90,&
>>> ABENDRETENTION 0
MC> ALTER MEDIADEFS \SEA,&
>>> SSLIST (\STAR, \SEA, \SKY),&
>>> FILECAT \SEA.FILE_CATALOG_SEA,&
>>> VOLCAT \SKY.MASTER_TAPE_CATALOG,&
>>> POOL TAPES_FOR_SEA,&
>>> LEVEL COMPATIBLE,&