Patent ID: 8700587

Claim:
A storage system, comprising: a memory storing WWN and S_ID conversion information, which includes a WWN and an S_ID, and a logical unit number (LUN) access management information which includes the WWN, a virtual LUN and a LUN; a processor which, in response to receiving a first frame including a request, which is used to inquire about the status of a logical unit (LU), and being received from at least one computer of a plurality of computers according to a fibre channel protocol, is configured to: obtain an S_ID from the first frame, search for a WWN by referring to the WWN and S_ID conversion information and using the S_ID, and search for a virtual LUN by referring to the LUN access management information and using the WWN, the processor being adapted to send a second frame to the at least one computer of the plurality of computers according to said fibre channel protocol in consideration of whether or not an entry of the virtual LUN is in the LUN access management information, wherein, if the first frame is received from a first computer and includes a first virtual LUN, which corresponds to a first LUN identifying a first LU which is accessible by the first computer, the storage system is adapted to send the second frame including first information, wherein the first virtual LUN is 0, and the first information indicates that the first LU, related to the first virtual LUN is installed in the storage system, wherein, if the first frame is received from a second computer of the plurality of computers, other than the first computer, and includes a second virtual LUN, which does not relate to any LU that is accessible by the second computer, the storage system is adapted to send the second frame including second information, the second information indicates that the second LU, related to the second virtual LUN, is not installed in the storage system, wherein, if the first frame is received from a third computer, other than the first and second computers, and includes a third virtual LUN, which corresponds to a third LUN, different from the first LUN, identifying a third LU which is accessible by the third computer, the storage system is adapted to send the second frame including third information, and wherein third virtual LUN is 0, and the third information indicates that the third LU, related to the third virtual LUN, is installed in the storage system.