Fragmented storage maps

A computing device comprising:

• an interface configured to interface and communicate with a dispersed or distributed storage network (DSN);
• memory that stores operational instructions;
• and
• processing circuitry operably coupled to the interface and to the memory, wherein the processing circuitry is configured to execute the operational instructions to:
• based on addition of or a determination to add a first storage unit (SU) to a site that includes at least two other SUs, obtain DSN address range assignments for the at least two other SUs, wherein the determination to add the first SU to the site that includes the at least two other SUs is based on at least one of receiving a request from another computing device, detecting a new SU activation within the site, or detecting an unfavorable storage capacity utilization level of at least one SU of the at least two other SUs;
• determine a common address range magnitude to transfer from each of the at least two other SUs as a first SU address range divided by a total number of SUs that includes the first SU and the at least two other SUs;
• and
• for each of the at least two other SUs:
• select a corresponding SU address range that is based on the common address range magnitude, wherein each corresponding SU address range of corresponding SU address ranges is based on a respective one of the at least two other SUs;
• and
• facilitate transferring corresponding encoded data slices (EDSs) that are associated with at least one data object and corresponding DSN address range assignments for each of the corresponding SU address ranges from the at least two other SUs to the first SU;
• and
• identify an optimization insertion point for the first SU based on addition of the first SU to the site that includes the at least two other SUs;
• and
• facilitate the optimization insertion point including at least one of taking an upper address range portion of a lower adjacent SU of the at least two other SUs to the first SU or taking down a lower address range portion of an upper adjacent SU of the at least two other SUs to the first SU.

A method for execution by a computing device, the method comprising:

• based on addition of or a determination to add a first storage unit (SU) to a site that includes at least two other SUs, obtaining, via an interface of the computing device that is configured to interface and communicate with a dispersed or distributed storage network (DSN), DSN address range assignments for the at least two other SUs;
• determining a common address range magnitude to transfer from each of the at least two other SUs as a first SU address range divided by a total number of SUs that includes the first SU and the at least two other SUs;
• and
• for each of the at least two other SUs:
• selecting a corresponding SU address range that is based on the common address range magnitude, wherein each corresponding SU address range of corresponding SU address ranges is based on a respective one of the at least two other SUs;
• and
• facilitating, via the interface, transferring corresponding encoded data slices (EDSs) that are associated with at least one data object and corresponding DSN address range assignments for each of the corresponding SU address ranges from the at least two other SUs to the first SU.