DSM/Tape Catalog User's Guide

Introduction to DSM/TC

DSM/Tape Catalog User’s Guide — 520233-008

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Current Default Node



To perform a variety of tasks for DSM/TC on both nodes, but issue MEDIACOM

commands only from \ROSE:

18> MEDIACOM (MEDIACOM will run on \ROSE.)

MC> (Commands affect \ROSE until VOLUME command.)

MC> ALTER POOL TEST_TAPES, VOLCAT TAPE_CAT, DENSITY 6250

MC> .

MC> VOLUME \TREE (All commands now affect \TREE.)

MC> ALTER POOL OPS_TAPES, VOLCAT TAPE_CAT, RESET TYPE

MC> .

MC> EXIT



To perform a variety of tasks for DSM/TC on \ROSE and one task on \TREE:

18> MEDIACOM (MEDIACOM will run on \ROSE.)

MC> INFO ...

MC> ALTER TAPEFILE ...

MC> .

MC> ALTER POOL OPS_TAPES, VOLCAT \TREE.TAPE_CAT,&

>>> RESET DENSITY

MC> INFO ...

MC> .

MC> EXIT

All the commands in this example affect DSM/TC on \ROSE except the ALTER

POOL command, which names \TREE in the command syntax.



This example shows how easy it is to use the wrong node. From \ROSE, you issue

a run command to have MEDIACOM run on \TREE, intending to perform several

tasks for DSM/TC on \TREE. However, the current default node remains \ROSE,

so the ALTER POOL command and all subsequent commands in the session

affect DSM/TC on \ROSE, not on \TREE:

3> \TREE.MEDIACOM (MEDIACOM will run on \TREE.)

MC> ALTER POOL OPS_TAPES, VOLCAT TAPE_CAT, RESET DENSITY

MC> .

MC> EXIT

The correct way to run MEDIACOM on \TREE and affect DSM/TC on \TREE is to

use a TACL SYSTEM command first. SYSTEM changes the node name for all

subsequent commands until another SYSTEM command is issued:

3> SYSTEM \TREE

4> MEDIACOM (MEDIACOM will run on \TREE.)

MC> ALTER POOL OPS_TAPES, VOLCAT TAPE_CAT, RESET DENSITY

MC> .

MC> EXIT

5> SYSTEM \ROSE