Patent ID: 7152149

Claim:
A disk array apparatus comprising: a host adapter for transferring data between a host system and the disk array apparatus; a cache memory for storing data written from the host adapter; a storage device adapter for executing control to write data to the cache memory or to read data from the cache memory; a control memory to which control information is to be written by the host adapter and the storage device adapter; a plurality of kinds of storage devices to which data are to be written on the basis of control by the storage device adapter; and a data movement control part provided in the storage device adapter, the host adapter creating a plurality of logical devices on the basis of storage areas of the plurality of kinds of storage devices, and executing control to cause the plurality of logical devices to be objects to be accessed from the host system, said plurality of loqical devices includinq first and second logical devices, the data movement control part executing control, when the host adapter receives an access control command to set/change an access attribute of the first logical device, to move data from the first logical device to the second logical device, wherein the plural kinds of storage devices differ from each other in reliability, wherein the first logical device includes storage areas of a first one of said plural kinds of storage devices, and the second logical device includes storage areas of a second one of said plural kinds of storage devices that has a different reliability than that of said first one of said plural storage devices, wherein the access attribute set/changed for the first logical device is one of an enable attribute and a disable attribute by which the first logical device is respectively enabled or disabled for an access, and wherein the data movement control part executes control to move data from the first logical device to the second logical device in response to the setting/changing of the access attribute of the first logical device according to the access control command, so as to move the data to storage areas of different reliability.