A method includes determining, by a managing unit of a dispersed storage network (DSN), an addition of a new storage unit to a group of storage units. The DSN includes a logical address space divided into a set of logical address sub-spaces, one of which is allocated to the group of storage units. The method further includes reorganizing, by the managing unit, distribution of the logical address sub-space among the new storage unit and each storage unit in the group of storage units to produce a reorganized logical address sub-space. The allocation includes the new storage unit's portion being between portions of first and second storage units. The method further includes transferring, by the first storage unit, a first group of encoded data slices to the new storage unit and transferring, by the second storage unit, a second group of encoded data slices to the new storage unit.