1. A method comprising: transferring updates received at a storage system to a write buffer of the storage system, the updates comprising write data; invoking a single-level sort procedure to sort the write data by a zone of a home location address of the write data; storing the sorted data on a disk-based log of the storage system; and invoking an event to trigger write back of the sorted data from the disk-based log to a home location array of the storage system.