To report filespaces that exist in the filespaces table, but have no corresponding entry in the occupancy table. The following SQL can be run on the TSM server via dsmadmc, but may take a while to run.
select node_name, filespace_name from filespaces f where not exists (select node_name, filespace_name from occupancy o where f.node_name = o.node_name and f.filespace_name = o.filespace_name);
If using a copy of the filespace and occupancy tables in MySQL, the following is simpler, but functionally equivalent:
select f.node_name, f.filespace_name from filespaces f left join occupancy o using (node_name, filespace_name) where o.node_name is null;