To clean up DDM-aware disk pool, use tool advertised below:
for the deletion itself of a given dataset source /afs/cern.ch/atlas/offline/external/GRID/ddm/DQ2Clients/setup.sh voms-proxy-init -voms atlas[:Group/Role] dq2-delete-replicas CERN-PROD_LOCALGROUPDISK
to locate owner of replica dq2-get-replica-metadata CERN-PROD_LOCALGROUPDISK