This parameter is used to override the default setting for the node name associated with the Tivoli Storage Manager (TSM) product. The node name is needed to allow you to restore a database that was backed up to TSM from another node.
The default is that you can only restore a database from TSM on the same node from which you did the backup. It is possible for the tsm_nodename to be overridden during a backup done through DB2 (for example, with the BACKUP DATABASE command).