Patent ID: 7305531
Filing Date: 2007-12-04
Classification: G06F,H04L

Abstract:
1. A network system comprising: a first computer system located in a first site; a first edge device located in the first site and coupled to the first computer system; a second computer system located in a second site and having at least one data storing device; and a second edge device located in the second site and coupled to the second computer system and coupled to the first edge device via a network; wherein the first edge device has at least one virtual data storing device for using to access by the first computer system, the virtual data storing device relating to the data storing device of the second computer system; wherein the first edge device receives a first write command, sent from the first computer system, and targeted to the virtual data storing device and sends a second write command corresponding to the first write command to the second edge device based on the first write command and sends a first response to the first computer system based on the first write command before receiving a second response sent from the second edge device indicating that data related to the second write command has been received by the second computer system.