All DB2® UDB commands require that the multi-node definition has permission to delete its own backup files from the server in order to properly reconcile the local backup repository with the server backup repository.
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Have the TSM administrator update the multi-node definition so that it has permission to delete its own backup files from the server. For example, on the TSM administrative command-line client: . dsmadmc update node <multi-node name> backdelete=yes