Managing migration of encoded data slices in a dispersed storage network

A computer readable memory device comprises:

• at least one memory section that stores operational instructions that, when executed by one or more processing modules of one or more computing devices of a dispersed storage network (DSN), causes the one or more computing devices to:
• determine whether to modify a configuration of a set of storage units of the DSN, wherein each storage unit of a set of storage units stores one or more sets of encoded data slices (EDSs), wherein each set of EDSs is associated with a respective unique set of encoded data slice (EDS) names such that a first set of EDSs is associated with a first unique set of EDS names and a second set of EDSs is associated with a second unique set of EDS names;
• in response to determining to modify the configuration of the set of storage units, obtain a first DSN address range set and first storage information for the set of storage units based on the configuration, wherein the first DSN address range set includes a first plurality of address range assignments for the set of storage units such that each address range assignment thereof corresponds to a respective one storage unit of the set of storage units;
• modify the configuration of the set of storage units to produce a modified configuration;
• modify the first DSN address range set to produce a second DSN address range set, wherein the second DSN address range set is based on the modified configuration and the first storage information, wherein the second DSN address range set includes a second plurality of address range assignment for the set of storage units such that each address range assignment thereof corresponds to the respective one storage unit of the set of storage units;
• transmit the second DSN address range set to the set of storage units;
• and
• facilitate migration of EDSs from each storage unit of the set of storage units in accordance with the modified configuration and the second DSN address range set.