1. A method for setting up a configuration definition of a disk array apparatus that accesses connected disk devices according to an I/O request sent from a host and executes the I/O request, comprising the steps of: referring to a model correspondence table for storing a host logical space of each model and the maximum number of said disk devices by a model name indicating a scale of said disk array apparatus and reading the corresponding host logical space and maximum number of said disk devices; calculating a starting address of a memory for storing the configuration information of said host logical space and said disk devices from said host logical space and the maximum number of said disk devices that were read; and storing said configuration information from said calculated starting address to said memory and creating a configuration definition table for accessing said disk devices.