1. A method comprises: identifying a plurality of dispersed storage networks (DSNs) for storing copies of dispersed storage encoded data based on global data retrieval accesses of the copies of the dispersed storage encoded data; determining a set of error coding dispersal storage parameters for at least one of the plurality of DSNs based on local data retrieval accesses allocated to the at least one of the plurality of DSNs; encoding data in accordance with the set of error coding dispersal storage parameters to produce a copy of the copies of the dispersed storage encoded data; and outputting the copy of the copies of the dispersed storage encoded data to the at least one of the plurality of DSNs.