Patent ID: 6904503
Filing Date: 2005-06-07
Classification: G06F,Y10S

Abstract:
1. A storage system in which a disk array device of a local side transmits a write data received from an upper device into a disk array device of a remote side asynchronously, each of said disk array device of the local side and said disk array device of the remote side comprising: a host interface control unit which receives a command from the upper device; a cache control unit which temporarily stores data received from said upper device; and a drive control unit which controls writing of the data of said cache control unit in physical disks of its own device; said disk array device of the local side comprising a first memory indicating data which has been received from said upper device and written into a logical volume of its own, but which has not been transferred to said disk array device of the remote side; said disk array device of the remote side comprising a second memory indicating data which has been received from said disk array device of the local side and has not been written to a logical volume of said disk array device of the remote side; and said disk array device of the local side, in response to reception of a synchronization command from the upper device via said host interface unit, judging whether all data written into said logical volume of said disk array device of the local side before a receiving time of the synchronization command have been written into the logical volume of said disk array device of the remote side.