Examples described herein relate to migrating data in a system having multi-tiered physical storage. In an example, relative weights corresponding to a plurality of data access parameters may be determined based on a ranking associated with each of the plurality of data access parameters. Further, a priority metric corresponding to each of a plurality of candidate types may be determined based on the relative weights of the plurality of data access parameters. Furthermore, one or more candidate types may be selected from the plurality of candidate types based on the priority metric corresponding to each of the plurality of candidate types. Moreover, data containers corresponding to the selected one or more candidate types may be migrated from a first tier storage to a second tier storage.