A storage has NAS and SAN functions and a high degree of freedom to
configure a system to reduce the management and operation cost. The
storage includes a plurality of interface slots in which a plurality of
interface controllers can be installed, a block I/O interface controller
which has SAN functions and which can be installed in the slot, a file I/O
interface controller which has NAS functions and which can be installed in
the slots, a storage capacity pool including a plurality of disk devices
accessible from the interface controllers, and a storage capacity pool
controller to control the storage capacity pool.
