Patent ID: 7640443
Filing Date: 2009-12-29
Classification: G06F,Y02D

Abstract:
1. A computer system comprising: a plurality of computers; a storage apparatus having a plurality of hard disk units and being connected to the plurality of computers; and a system management apparatus connected to the plurality of computers and the storage apparatus, wherein the storage apparatus controls a data write operation and a data read operation between the computers and the hard disk units, and controls power states of a plurality of power supplies of the plurality of hard disk units on a group basis with the group including one or more disk units, wherein the system management apparatus collects running information about the plurality of computers and computer execution job information for each computer, and determines a time of changing the power state of the power supplies of the plurality of hard disk units on the group basis to record the collected information and the time of changing the power state of the power supplies on the group basis, wherein the storage apparatus changes the states of the power supplies of the plurality of hard disk units using the time of changing the power state of the power supplies recorded by the system management apparatus on the group basis, wherein if an actual start timing of the data read/write operation is shifted to earlier than the ON time of the power supplies, the storage apparatus sends an instruction to hold the data write/read operation to the one of the plurality of the computers, wherein if an actual end timing of the data read/write operation is shifted to later than the OFF time of the power supplies of the plurality of hard disk units on the group basis, the storage apparatus keeps on the power supplies of the plurality of the hard disk units until the data read/write operation is completed, and wherein if the actual end timing of the data read/write operation is shifted to later than the next ON time of the power supplies of the plurality of hard disk units on the group basis, the storage apparatus keeps on the power supplies of the plurality of hard disk units until the next change in power states of the power supplies of the plurality of hard disk units on the group basis.