A method of caching data includes: A. mirroring data processed by a first storage processor and a second storage processor between a first memory device of the first storage processor and a second memory device of the second storage processor; B. each of the first storage processor and the second storage processor monitoring an availability of the other of the first storage processor and the second storage processor; C. copying data stored in the first memory device to a third memory device and mirroring data processed by the first storage processor between the first memory device and the third memory device when the second storage processor becomes unavailable to the first storage processor; and D. copying data from the first memory device to the second memory device and mirroring data processed by the first storage processor and the second storage processor between the first memory device and the second memory device when the second storage processor becomes available to the first storage processor.