Patent ID: 7028137

Claim:
A storage control subsystem that can communicably connect to a host, comprising: a disk portion that stores data sent by the host; a channel control unit that constitutes an interface with the host; a disk control unit that is connected to the disk portion and constitutes an interface with the disk portion; a cache memory unit that temporarily stores data that is sent and received to and from the channel control unit and the disk control unit; and a control memory that stores information on the constitution of a plurality of logical volumes formed according to disk allocation, wherein the control memory comprises: online information indicating whether a logical volume in the disk portion is online, and information on a path between the online logical volume and the host to which the online logical volume is connected, wherein the storage control subsystem receives a referral request for the online information and the information of the path from the host via another storage control subsystem, and, wherein when information on path cancellation with respect to the online logical volume is received from the host via the another storage control subsystem, the path cancellation with respect to the online logical volume that is designated by the path cancellation is executed.