Patent ID: 7636239

Claim:
A disk array device comprising: a storage unit at an upper side of the disk array device; a control unit at a lower side of the disk array device; an air inlet at a position lower than the position of the control unit; an air outlet between the storage unit and the control unit; a first cooling fan; a second cooling fan; and a third cooling fan, wherein the control unit is cooled by first air passing through a first passage according to the second fan, the first passage including the air inlet, the control unit and the air outlet; wherein the storage unit is cooled by second air passing through a second passage according to the first and the second cooling fans, the second passage including the air inlet, outside of the control unit, the second cooling fan, the storage unit and the first cooling fan, wherein a LOW cooling target is cooled by third air passing through a third passage according to the third cooling fan, the third passage including the air inlet, outside of the control unit, the third cooling fan, the LOW cooling target and the air outlet, wherein the LOW cooling target is a cooling target among cooling targets in the control unit, and the LOW cooling target has an upper limit temperature which is low, and wherein the third air is part of the second air passing through the second passage.