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 |
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.
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