Aspects of the present invention include a system, method, and computer program product for skewing expected wearout times of memory devices in an array are provided according to some embodiments of the present invention. In general, the method includes determining or receiving an amount of spare space to provide in an array of memory devices, allocating the spare space non-uniformly to the memory devices in the array, and skewing expected wearout times of the memory devices by controlling writing of data to the array according to the allocation of the spare space.