A method and a system for use in managing tiering in a cache-based system is disclosed wherein the cache-based system comprises a first data storage tier and a second data storage tier configured such that the performance characteristics associated with one of the tiers is superior to the performance characteristics associated with the other tier. In at least one embodiment the method and system comprises collecting a first set of I/O activity data for at least one data unit located in a cache, wherein the at least one data unit is associated with a data group located on the first data storage tier; collecting a second set of I/O activity data for the data group located on the first data storage tier; analyzing the first and second set of I/O activity data; and based on the analysis and the performance characteristics associated with the second data storage tier, determining whether the data group should be migrated to the second data storage tier.