The storage system includes disk control clusters. Each cluster has channel IF
units, disk IF units and local shared memory units. The channel IF units, disk
IF units and local shared memory units in the plurality of disk control clusters
are connected to each other across the disk control clusters by interconnection,
global information control unit for storing management information about the disk
control clusters is connected to the interconnection. Host computers and the channel
IF units of the disk control clusters are connected via front-end switch for storing
copy of the management information. Since the front-end switch reflects the contents
of the copy of the management information on routing table, an access request from
the host computer can be sent to a suitable disk control cluster.
