Abstract: A data storage system and method of storing data with at least two controllers (200, 300) which share a storage space (244, 344) on an array of storage devices and which support the same set of logical upstream devices. The controllers (200, 300) share the workload by dividing the shared storage space (244, 344) into stripes where the stripes are sufficiently small to divide the workload uniformly across the storage device. This is achieved in the case of two controllers (200, 300) of a log structured array by dividing the storage space into odd and even tracks, all odd tracks being designated to one controller (300) and all even tracks to the other controller (200).