A storage system includes a network adapter, a channel adapter, a shared memory,
a cache memory, a disk adapter, a switch and a storage device. The storage device
stores data. The network adapter includes a port connected to a local area network,
and a NAS processor and an I/O processor. The NAS processor receives a file access
request via the port, and gives instructions to access the data stored in the storage
device as well as instructions to back up the data stored in the storage device.
The I/O processor transfers access to the data stored in the storage device to
the cache memory, and transfers backup instructions for the data stored in the
storage device to the shared memory. The channel adapter includes a port and an
I/O processor. The I/O processor sends out data stored in the storage device to
the device storing backup data, in response to a backup instruction from the network adapter.
