Patent ID: 7315922

Claim:
A method of issuing a command from a target to an initiator in a system that includes an information processing apparatus that has a host bus adapter with only an initiator function to issue the command, and a disk array apparatus that has a channel adapter with only a target function to receive and execute the command, the information processing apparatus and the disk array apparatus being connected via a communication line, comprising: polling including the information processing apparatus transmitting a status verifying message to the disk array apparatus to verify a status of the disk array apparatus; preparing including the disk array apparatus preparing, upon receiving the status verifying message, a response message by attaching a request for a command of a process to be executed to the status verifying message; transmitting including the disk array apparatus transmitting the response message to the information processing apparatus; and creating including the information processing apparatus creating a command based on the request attached to the response message; and transmitting including the information processing apparatus transmitting the command created to the disk array apparatus.