DSM/Tape Catalog User's Guide

Introduction to DSM/TC
DSM/Tape Catalog User’s Guide — 520233-008
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System Search Space
Example
If you have three nodes in your DSM/TC system (named \SKY, \STAR, and \SEA), after
the DSM/TC software is installed, you must issue three ALTER MEDIADEFS
commands to create a system search list on each node. These examples show partial
syntax of the commands:
MC> ALTER MEDIADEFS \SKY ... SSLIST (\SKY, \STAR, \SEA) ...
MC> ALTER MEDIADEFS \STAR ... SSLIST (\STAR, \SKY, \SEA) ...
MC> ALTER MEDIADEFS \SEA ... SSLIST (\SEA, \SKY, \STAR) ...
System Search Space
The system search space is a list of all cataloged tape names in DSM/TC. The system
search space is constructed by combining the tape names from all included pools of
the volume catalogs across all nodes in the system search list.
MEDIACOM commands check this list to verify that the name of a tape to be added to
a catalog does not already exist. They also make certain that a tape is not labeled with
a name already on the list.
Current Default Node
The current default node is the default system for your current TACL session. Unless
otherwise specified, MEDIACOM commands take effect on this node. To direct the
MEDIACOM interface to use a node other than the current default node, name a node
in the command syntax or set a node name in the MEDIACOM session using a
VOLUME command.
Track which node is affected by a MEDIACOM command. Otherwise you can alter or
receive information for the wrong node. If in doubt about which node is being used, use
the ENV command during a MEDIACOM session to display the current default node.
Examples
These examples assume that the default node is \ROSE and DSM/TC includes two
nodes, \ROSE and \TREE:

To perform several tasks for DSM/TC on node \TREE, from \ROSE, when the two
nodes are in different buildings:
18> MEDIACOM (MEDIACOM will run on \ROSE.)
MC> VOLUME \TREE (All commands affect \TREE until EXIT.)
MC> ALTER POOL OPS_TAPES, VOLCAT TAPE_CAT, RESET DENSITY
MC> .
MC> .
MC> EXIT