Retrieval and recovery of data chunks from alternate data stores in a deduplicating system

摘要

For recovery of data chunks from alternate data stores, a method detects a damaged copy of a first data chunk of a deduplicated data object within a first storage pool of plurality of storage pools storing data chunks. The method further locates an undamaged copy of the first data chunk in an alternate storage pool within the plurality of storage pools from a system-wide deduplication index that indexes each data chunk in each storage pool. In addition, the method creating a new object holding the undamaged copy in the first storage pool, the new object linked to the damaged copy through the system-wide deduplication index.

主权项

1. A method for recovery of data chunks from alternate data stores comprising:
detecting, by use of a processor, a damaged copy of a first data chunk of a deduplicated data object within a first storage pool of plurality of storage pools storing data chunks; locating an undamaged copy of the first data chunk in an alternate storage pool within the plurality of storage pools from a system-wide deduplication index that indexes each data chunk of the deduplicated data object in each storage pool; creating a new object holding an object copy of the undamaged copy in the first storage pool, the new object comprising undamaged object copies of damaged first storage pool data chunks from the alternate storage pool; cataloging the object copy to the damaged copy within the first storage pool through the system-wide deduplication index; assigning new identifiers to each undamaged object copy of damaged first storage pool data chunks in the new object; and updating references to the damaged copy to correspond to the new identifiers of the undamaged copies.