1. A system in communication with data storage, for storing data, and comprising: a first log structured array storing data in a storage device; a second log structured array in the storage device storing metadata for the data in the first log structured array, wherein the second log structured array is nested within the first log structured array, and wherein the first and second log structured arrays comprise separate instances of log structured arrays; and a component for allocating address space in the second log structured array for metadata when the allocation of address space is required for metadata for data stored in the first log structured array.