Migrating data in response to adding incremental storage resources in a dispersed storage network

A processing system of a computing device comprises:

• at least one processor;
• a memory that stores operational instructions, that when executed by the at least one processor cause the processing system to:
• update a plurality of storage cohorts to add an incremental storage cohort, wherein each storage cohort includes a set of storage units;
• for each storage cohort of the updated plurality of storage cohorts, initiate a slice listing process to identify a plurality of DSN addresses associated with storage of a plurality of data objects within the each storage cohort;
• for each DSN address of the plurality of DSN addresses, obtain ranked scoring information for the each storage cohort of the updated plurality of storage cohorts;
• identify one storage cohort of the updated plurality of storage cohorts based on the ranked scoring information;
• and
• when the identified storage cohort is different than another storage cohort associated with current storage of encoded data slices associated with a DSN address of the identified storage cohort, initiate a migration process to migrate the encoded data slices from the another storage cohort to the identified storage cohort.

A non-transitory computer readable storage medium comprises:

• at least one memory section that stores operational instructions that, when executed by a processing system of a dispersed storage network (DSN) that includes a processor and a memory, causes the processing system to:
• update a plurality of storage cohorts to add an incremental storage cohort, wherein each storage cohort includes a set of storage units;
• for each storage cohort of the updated plurality of storage cohorts, initiate a slice listing process to identify a plurality of DSN addresses associated with storage of a plurality of data objects within the each storage cohort;
• for each DSN address of the plurality of DSN addresses, obtain ranked scoring information for the each storage cohort of the updated plurality of storage cohorts;
• identify one storage cohort of the updated plurality of storage cohorts based on the ranked scoring information;
• and
• when the identified storage cohort is different than another storage cohort associated with current storage of encoded data slices associated with a DSN address of the identified storage cohort, initiate a migration process to migrate the encoded data slices from the another storage cohort to the identified storage cohort.