Performance monitoring in a storage enclosure

A bus analyser for analysing the operation of a bus to which a plurality of devices are connectable is disclosed. The devices are operatively coupled to a host device running a host application and the analyser is adapted to be housed in an enclosure which, in use, houses at least one of the devices. The analyser is arranged to extract data from the bus, process the extracted data; and communicate processed data to an environmental control and monitoring unit through a secondary communication bus.