HIGH SPEED DATA DUMPING METHOD

PURPOSE:To improve the service by completing a dump output processing at the time when a system stops, in a short period. CONSTITUTION:In a data processing system to which an extension storage device 2 is connected, in addition to a magnetic storage device 5, a dump output of main storage data is outputted to the magnetic storage device 5, and also, outputted to the extension storage device 2, as well in parallel thereto. As for as a free area exists in the extension storage device 2, the dump output is executed repeatedly, and thereafter, by synthesizing the data of both storage devices in order, the original data is restored. In this regard, by other data processing system connected to the extension storage device 2, a data synthesis processing, a fault search processing, etc., can also be executed.