a. Fill several 1Tb volumes.
b. Delete it all at once.
c. Profit!

Actually, (c) expands to 'watch the Filer have a complete head-fit and peg the CPUs for several minutes. Since throughput has just fallen through the floor, watch all the businessy-businessy apps expire messily and then deal with the throng of angry suits between you and the coffee machine.'

The Netapp tech-note boils down to 'Don't do that. Performance can be sub-optimal.'