Rebuilding encoded data slices in a dispersed storage network

A non-transitory computer readable storage medium 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:
• for each set of encoded data slices of a plurality of sets of encoded data slices that includes at least one of a plurality of to-be rebuilt encoded data slices:
• determine a cumulative memory health for memory devices of storage units storing other encoded data slices of a respective set of encoded data slices;
• and
• determine a probability of data loss based on the cumulative memory health, respective dispersed storage error encoding parameters, and a number of encoded data slices requiring rebuilding in the respective set of encoded data slices;
• prioritize rebuilding of the plurality of to-be rebuilt encoded data slices based on the probability of data loss for each set of encoded data slices of the plurality of sets of encoded data slices;
• and
• rebuild, in accordance with the prioritizing, a first to-be rebuilt encoded data slice of the plurality of to-be rebuilt encoded data slices to produce a first rebuilt encoded data slice.

A computing device of a group of computing devices of a dispersed storage network (DSN), the computing device comprises:

• an interface;
• a local memory;
• and
• a processing module operably coupled to the interface and the local memory, wherein the processing module functions to:
• for each set of encoded data slices of a plurality of sets of encoded data slices that includes at least one of a plurality of to-be rebuilt encoded data slices:
• determine a cumulative memory health for memory devices of storage units storing other encoded data slices of a respective set of encoded data slices;
• and
• determine a probability of data loss based on the cumulative memory health, respective dispersed storage error encoding parameters, and a number of encoded data slices requiring rebuilding in the respective set of encoded data slices;
• prioritize rebuilding of the plurality of to-be rebuilt encoded data slices based on the probability of data loss for each set of encoded data slices of the plurality of sets of encoded data slices;
• and
• rebuild, in accordance with the prioritizing, a first to-be rebuilt encoded data slice of the plurality of to-be rebuilt encoded data slices to produce a first rebuilt encoded data slice.