1. A method for utilizing a global digests cache in a deduplication process in a data deduplication system using a processor device in a computing environment, comprising: partitioning input data into input data chunks; calculating input digest values for each of the input data chunks; finding positions of similar repository data in a repository of data for each of the input data chunks; locating and loading repository digests of the similar repository data into the global digests cache, wherein the global digests cache contains at least a plurality of digests previously loaded by a plurality of deduplication processes; and matching input digests of the input data chunks and the repository digests contained in the global digests cache for locating data matches.