| US 7,543,108 B2 | ||
| Storage system and storage control method achieving both power saving and good performance | ||
| Shinobu Kakihara, Odawara (Japan); and Mitsuhide Sato, Odawara (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on Aug. 08, 2006, as Appl. No. 11/500,436. | ||
| Claims priority of application No. 2006-170563 (JP), filed on Jun. 20, 2006. | ||
| Prior Publication US 2007/0294552 A1, Dec. 20, 2007 | ||
| Int. Cl. G06F 13/34 (2006.01) | ||
| U.S. Cl. 711—112 [711/114; 713/320] | 20 Claims |
| 1. A storage system connected to a host device from which an IO command is sent, the storage system comprising:
a plurality of load devices that act as loads including a plurality of storage devices;
a current measuring unit that measures a current value flowing into the plurality of load devices;
a power calculating unit that calculates, at each time, a power consumption value consumed by the plurality of load devices
based on the measured current value; and
a controller that receives the IO command from the host device, and accesses a storage device that follows the IO command,
out of the plurality of storage devices;
wherein the controller carries out power consumption control such that the calculated power consumption value is not more
than a predetermined allowed power value and a difference between the power consumption value and the allowed power value
is reduced.
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