In one embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith. The embodied program instructions are readable and/or executable by a processor to cause the processor to create, by the processor, a second logical block on a multi-tier file system, the second logical block referencing data that is associated with a first logical block. The program instructions also cause the processor to determine, by the processor, a measure of access requests that will be directed to the data via the second logical block versus the first logical block. Moreover, the program instructions cause the processor to transfer, by the processor, a proportion of a heatmap value for the data between the first logical block and the second logical block based on the measure of accesses that will be directed to the data via the second logical block versus the first logical block.