Patent ID: 8904201

Claim:
A storage system comprising: a first controller configured to control a first power source in a standby state or a power-on state; a plurality of first fans configured to cool the first controller; a second controller configured to control a second power source in the standby state or the power-on state and send and receive information to and from the first controller; a plurality of second fans configured to cool the second controller; and a storage device including a plurality of storage units; wherein when the first power source is in the standby state, the first controller is configured to control the first fans; and when the first power source is in the power-on state, the first controller is configured to control the first fans and execute data input/output processing on the storage device; wherein when the second power source is in the standby state, the second controller is configured to control the second fans; and when the second power source is in the power-on state, the second controller is configured to control the second fans and execute the data input/output processing on the storage device; and wherein when a fan failure occurs in a fan of the first fans or the second fans for cooling at least one controller of the first controller and the second controller, on condition that the other controller is in a normal state, the one controller is configured to control a power source of either the first power source or the second power source, which is a control target of the one controller, in the standby state; and when a power source which is a control target of the other controller is in the standby state, on condition that a destaging processing is executed, the one controller is configured to control the power source, which is the control target of the one controller, in the standby state, wherein a destaging processing is storing data, which is stored in the cache memory, in the storage units.