4Wendy Osbom, Steve Fox. Automated and scheduled ma- intenance of digital library collections [ C ]//Proceedings of the 2nd Information Conference on Digital Information Man- agement. 2007:49-54.
7Li Feifei, Yu Xiangzhan, Wu Gang. Design and implemen- tation of high availability distributed system based on multi- level hearbeat protocol [ C ]//International Conference on Control Automation and System Engineering. 2009:83-87.
8Sharifi M, Hamedi S A. Failure prediction mechanisms in cluster system[C]//Intemational Conference on Biocomputa- tion, Bioinformatics, and Biomedical Technologies. 2008:23-28.
9[美]Richard Stevens W,Stephen A Rago.UNIX环境高级编程(英文版)(第2版)[M].北京:人民邮电出版社,2006.