Method for maximum data reduction combining compression with deduplication in storage arrays

摘要

One example method includes storing a user application input/output operation (IO) in a compression cache portion of a cache memory wherein the user application IO is associated with a data block, compressing the data block to produce a compressed data block, hashing the compressed data block to create a hash that uniquely corresponds to the data block, and storing the hash in a deduplication digest portion of a cache memory, wherein the deduplication digest portion includes a plurality of groups, each of which corresponds to a particular extent to which a data block is compressible. When a compressibility of the data block exceeds a threshold, the data block is retained in the compression cache portion, and when the compressibility of the data block does not exceed the threshold, the data block is flushed from the compression cache portion to disk.