Patent ID: 7353406
Filing Date: 2008-04-01
Classification: G06F,Y02D

Abstract:
1. A computer system comprising: a storage system including a first disk device configuring a first logical unit, a second disk device configuring a second logical unit, and a controller for accessing to the first logical unit and the second logical unit; and a disk controller requesting an access to the first logical unit and the second logical unit and a disk power supply control circuit instructing the controller to turn on or off the first disk device configuring the first logical unit and the second disk device configuring the second logical unit, wherein after the disk power supply control circuit determines that the disk controller terminates requesting the access to the first logical unit, the disk power supply control circuit issues an instruction to turn off the first disk device configuring the first logical unit to the controller, wherein, based on the instruction, the controller turns off the first disk device configuring the first logical unit independently of the second disk device configuring the second logical unit, wherein the disk controller is configured to request an access to the second logical unit after a completion of accessing to the first logical unit, wherein the disk power supply control circuit determines whether or not remaining time until a scheduled time of terminating the access to the first logical unit is shorter than a predetermined time, and wherein when the remaining time becomes shorter than a predetermined time, the disk power supply control circuit instructs the controller to turn on the second disk device configuring the second logical unit.