A method and system for storage load balancing based on virtual synthetics metadata. When storing data onto a storage cluster, data submitted thereto may often be distributed unevenly across the constituent storage nodes thereof. To address the issue, some form of load balancing (or re-distribution of data) across the storage nodes may be implemented. Existing load balancing techniques, however, tend to migrate data between storage nodes without consideration for the efficient utilization of available storage space on the storage node where the data ends up (or destination storage node). Accordingly, the disclosed method and system propose a load balancing mechanism whereby the migrated data dedupes well, thereby securing the efficient consumption of storage space on the destination storage node.