Priority based rebuilding

A computer readable memory comprises:

• a first memory section that stores operational instructions that, when executed by a computing device of a dispersed storage network (DSN), causes the computing device to:
• determine a data priority level for a data object to be stored in the DSN in accordance with dispersed storage error encoding parameters;
• determine slice priority levels based on the data priority level;
• encode the data object in accordance with the dispersed storage error encoding parameters to produce a plurality of sets of encoded data slices, wherein a first subset of encoded data slices of a set of encoded data slices of the plurality of sets of encoded data slices has a first slice priority level and wherein a second subset of encoded data slices of the set of encoded data slices has a second slice priority level;
• and
• a second memory section that stores operational instructions that, when executed by a rebuilding module of the DSN, causes the rebuilding module to:
• while writing the plurality of sets of encoded data slices to storage units of the DSN:
• detect a slice error for an encoded data slice of the set of encoded data slices;
• determine whether the encoded data slice has the first or the second slice priority level;
• when the data priority level is below a data priority threshold and the encoded data slice has the first slice priority level, facilitate rebuilding of the encoded data slice;
• and
• when the data priority level is below the data priority threshold and the encoded data slice has the second slice priority level, forego rebuilding of the encoded data slice.