Merging write-back and write-through cache policies

In one embodiment, the present invention includes a method for writing data to a disk if inserting the data into a cache, such as a disk cache associated with the disk, would cause a threshold of dirty data in the cache to be met or exceeded. Further, in certain embodiments, the cache may store data according to a first cache policy and a second cache policy. A determination of whether to store data according to the first or second policies may be dependent upon an amount of dirty data in the cache, in certain embodiments. In certain embodiments, the cache may include at least one portion reserved for clean data.