1. A method comprises: for a first group of data segments: selecting a first vault parameter set from a plurality of vault parameter sets, wherein the first vault parameter set includes a first set of parameters regarding dispersed error encoding data segments of the first group of data segments; encoding the first group of data segments in accordance with the first vault parameter set to produce a first plurality of sets of encoded slices; and generating a first plurality of sets of slice names for the first plurality of sets of encoded slices in accordance with the first vault parameter set, wherein a slice name of the first plurality of sets of slice names includes a vault identifier, a first vault parameter set identifier, and a common object name for the first group of data segments; and for a second group of data segments: selecting a second vault parameter set from the plurality of vault parameter sets, wherein the second vault parameter set includes a second set of parameters regarding dispersed error encoding data segments of the second group of data segments; encoding the second group of data segments in accordance with the second vault parameter set to produce a second plurality of sets of encoded slices; and generating a second plurality of sets of slice names for the second plurality of sets of encoded slices in accordance with the second vault parameter set, wherein a slice name of the second plurality of sets of slice names includes the vault identifier, a second vault parameter set identifier, and a common object name for the second group of data segments.