Slice migration in a dispersed storage network

A method for execution by a destination storage unit of a storage network that includes a processor, the method comprises:

• storing a slice to migrate in a memory device associated with the destination storage unit;
• receiving a slice verification request from a source storage unit, wherein the slice verification request includes one or more of:
• a slice identifier, the slice, a revision indicator, a verification method indicator, or a nonce of the slice verification request;
• generating an integrity value based on the slice to migrate and the nonce of the slice verification request based on a verification method indicator of the request, wherein generating the integrity value includes performing a hashing function on the slice and the nonce to produce a hash result as the integrity value when the verification method indicator indicates to produce a hash result and wherein generating the integrity value includes generating a signature utilizing a private key associated with the destination storage unit over the slice and the nonce to produce a signed package as the integrity value when the verification method indicator indicates to produce a signature;
• sending the integrity value to the source storage unit;
• and
• updating a slice identifier assignment, wherein updating the slice identifier assignment associates the destination storage unit with the slice identifier and disassociates the source storage unit with the slice identifier in a storage network address table.

A processing system of a source storage unit of a storage network 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:
• send a slice to migrate from the source storage unit to a destination storage unit;
• generate a slice verification request and send the slice verification request to the destination storage unit, wherein the slice verification request includes one or more of:
• a slice identifier, the slice, a revision indicator, a verification method indicator, or a nonce of the slice verification request;
• receive an integrity value from the destination storage unit;
• determine when the integrity value compares favorably to the slice verification request, by determining when a hash of the slice and the nonce of the slice verification request matches the integrity value or determining when a decrypted signature of the integrity value matches a hash of the slice and the nonce or the slice and the nonce;
• when the processing system determines that the integrity value compares favorably to the slice verification request, update a slice identifier assignment associated with the slice identifier corresponding to the slice, wherein updating the slice identifier assignment associates the destination storage unit with the slice identifier and disassociates the source storage unit with the slice identifier in a storage network address table;
• and
• delete the slice from the source storage unit.