Virtualization by multipath management software for a plurality of storage volumes

A host computer coupled to a first storage controller for providing a first volume, and a second storage controller for providing a second volume making a pair with the first volume, comprising:

• at least one task application unit for issuing a write request and a read request;
• and
• a path management unit for managing an access route to each of the volumes,
• wherein the path management unit is configured to:
• set a plurality of first paths serving as access routes from the host computer to the first volume, and a plurality of second paths serving as access routes from the host computer to the second volume;
• provide the first and second volumes as a third volume to the task application unit;
• and
• transmit through the first path the write request for writing data in the third volume which is issued from the task application unit.

A path management program for a host computer coupled to a first storage controller for providing a first volume, and a second storage controller for providing a second volume, the host computer executing a task application, the path management program controlling the host computer to execute the processings of:

• setting a plurality of first paths serving as access routes from the host computer to the first volume, and a plurality of second paths serving as access routes from the host computer to the second volume;
• providing the first and second volumes as a third volume to the task application unit;
• and
• transmitting through the first path the write request for writing data in the third volume which is issued from the task application.