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  • generates an AIP for the Item (but does not transmit it)
  • computes a checksum on the local AIP
  • requests from the replication storage service a checksum for the replica AIP
  • compares the 2 checksums

The task will thus fail only if the checksums differ, which can only happen if some part of the Item (metadata or bitstream) itself differs. If the version of the item that is believed to be authentic is the repository (local) one, then a simple performance of 'transmitAIP' task on the item will restore synchrony. For collections and communities, this task also does an 'extent' comparison, which means that it will determine whether the replica store has an AIP for every item known (locally) to be in the collection or community.

Repairing Damage