Abstract: Inventive aspects include an input/output (I/O) interceptor logic section having an I/O interface coupled with a storage stack. The I/O interface may intercept write I/Os, read I/Os, and flush requests from an application. Write holding buffers associated with different kinds of non-volatile storage devices may store the write I/Os. A re-order logic section may change an order of the write I/Os, and combine the re-ordered write I/Os into a combined write I/O. A dynamic heterogeneous flush control logic section may receive the flush requests from the I/O interface, communicate write I/O completion of the write I/Os to the application without write I/Os being committed to the non-volatile storage devices, and cause the combined write I/O to be written to the non-volatile storage device responsive to a dynamic flush threshold, a threshold amount of data being accumulated, or an expiration of a predefined time period.