Patent ID: 7757279
Filing Date: 2010-07-13
Classification: H04L

Abstract:
1. A storage subsystem which is connected to a host computer through a communication line, comprising an interface which is used for connecting to said communication line, wherein, said interface comprises a first filter which judges, on the occasion of having received communication packets from said communication line, whether there is a communication packet with a predetermined format for use in an access to said storage subsystem, among the communication packets; wherein said interface further comprises: a second filter which receives the communication packet judged to be for access to said storage subsystem in said first filter, and judges whether the received communication packet is permitted access to a storage area in said storage subsystem and is transmitted from said host computer, a traffic measuring and judging unit which measures: traffic of all communication packets received in the interface, traffic of a communication packet judged not to be the packet with said predetermined format in said first filter, and traffic of a communication packet judged not to be transmitted from said host computer in said second filter, wherein said traffic measuring and judging unit uses the three measured traffics to judge whether a communication failure is generated, and a communication failure alerting unit which alerts a management server connected to said storage subsystem, wherein the management server comprises a function of displaying information alerted, in case that it is judged that a communication failure is generated in said traffic measuring and judging unit, wherein: in case that said host computer is permitted to access said storage subsystem, said interface further comprises an access permission table having information which uniquely specifies the host computer, a virtual storage area identification which the host computer arbitrarily assigns to a storage area in said storage subsystem, and an actual storage area identification which corresponds to said virtual storage area identification and which uniquely specifies a storage area in said storage subsystem, said storage area being permitted access by the host computer, and said second filter judges whether the received communication packet is permitted to access said storage area and is transmitted from the host computer in accordance with information stored in said access permission table.