US 7,321,955 B2
Control device, control method and storage medium recording a control program for controlling write-back schedule of data from cache memory to a plurality of storage devices
Hideaki Ohmura, Kawasaki (Japan)
Assigned to Fujitsu Limited, Kawasaki (Japan)
Filed on Sep. 08, 2004, as Appl. No. 10/935,080.
Claims priority of application No. 2004-107030 (JP), filed on Mar. 31, 2004.
Prior Publication US 2005/0223168 A1, Oct. 06, 2005
Int. Cl. G06F 12/12 (2006.01)
U.S. Cl. 711—136  [711/113; 711/114; 711/133; 711/134; 711/135; 711/143] 17 Claims
OG exemplary drawing
 
1. A storage control device for controlling a plurality of storage devices, comprising:
an LRU write-back unit for writing back data stored in cache memory of the storage control device to the plurality of storage devices by the LRU method;
a write-back group management unit managing a plurality of groups of the storage devices, wherein a range of a number of write-backs currently executed by the LRU write-back unit is predefined for each of the groups and each storage device is grouped into a group which has the range including the number of write-backs currently executed by the LRU write-back unit for the storage device; and
a write-back schedule processing unit for selecting a storage device within a group whose range indicates smaller number of write-backs than other groups and writing back data into the selected storage device.