A method, computer program product, and computer system for receiving, at a computing device, an I/O request directed to a compressed data portion of a storage system. It may be determined whether the I/O request includes one of a first portion of information and a second portion of information. An address of the compressed data portion may be obtained via downward mapping if the I/O request includes the first portion of information. The address of the compressed data portion may be obtained via upward mapping if the I/O request includes the second portion of information. The I/O request may be executed at the compressed data portion.