Storage subsystem and method for recovering data in storage subsystem

A method for recovering data in a storage subsystem coupled to a host computer comprising:

• a storage device unit for storing data from the host computer;
• a control unit for controlling a storage area of the storage device;
• and
• a memory unit to which the control unit accesses;
• wherein a logical device in the storage device unit is allocated to a virtual logical device provided to the host computer and a data from the host computer is stored in the storage device unit using a page mapping information stored in the memory unit and a track mapping information stored in the storage device unit;
• the track mapping information is composed of a first track information including a status information and an address information within the logical device and a second track information including a status information and an address information within the virtual logical device;
• the first track information and the second track information are associated via the address information;
• and
• when the first track information or the second track information is abnormal, recovery is performed using an address information of the other track information which is normal.