Patent ID: 6591351
Filing Date: 2003-07-08
Classification: G06F,Y10S

Abstract:
A storage system which receives a write command from an upper device as a communicating object, and stores data contained in the write command into a storage disk comprising:a first interface circuit supplied with the write command from said upper device; a second interface circuit for outputting data contained in said write command received from said upper device and information identifying said data to a different storage system asynchronously with a timing different from a received timing of the write command from the upper device; said first interface circuit, in response to reception of a query command concerning said data from said upper device, outputting information identifying said data outputted together with said data, before transmission from said second interface to said different storage system, to said upper device; and said first interface circuit receiving the information inputted to said different storage system and the information identifying said data through said second interface circuit and outputting the same, to said upper device.