Abstract: A method for asymmetrically scheduling buffer cache of disk array. The method including: (1) detecting whether access from a upper layer is hit in a buffer cache, proceeding to (7) if yes, and proceeding to (2) if no; (2) detecting whether the buffer cache is full, proceeding to (3) if yes, and proceeding to (5) if no; (3) detecting whether the number of pages of a sacrificial disk is greater than a threshold, proceeding to (4) if yes, and proceeding to (6) if no; (4) selecting and replacing a cold page of the sacrificial disk; (5) buffering data requested by a user in a blank page in the buffer cache; (6) selecting and replacing all cold pages of the buffer cache; and (7) reading or writing the data, and changing positions or status thereof in pages of the buffer cache.
Type:
Grant
Filed:
June 23, 2015
Date of Patent:
April 18, 2017
Assignee:
HUAZHONG UNIVERSITY OF SCIENCE AND TECHONLOGY
Inventors:
Qiang Cao, Shenggang Wan, Si Wu, Changsheng Xie