Dual counter consistency control for fault toleran
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专利名称：Dual counter consistency control for fault tolerant network file servers
发明人：Dah-Haur David Lin,Shaw-Ben Shi,Yi-Hsiu Wei 申请号：US08/484228
申请日：19950607
公开号：US05713017A
公开日：
19980127
专利内容由知识产权出版社提供
摘要：A consistency control method for a fault tolerant file system. Data files in this fault tolerant file system are replicated on file system servers. The update request will be sent to all the file servers. However, since different servers might receive update requests in different order. The "dual-counter" scheme described in this invention is to resolve this problem. To perform an update, the client needs to obtain a sequence number from a sequencer. Two counters will be maintained by each server. The first counter is used primarily by the sequencer to sent out sequence numbers. The second counter is used by the server to keep track of the largest sequence number of requests which have been completed on the server. With the sequence numbers and the first and second counters, updates will be performed in the same order on different file servers.
申请人：INTERNATIONAL BUSINESS MACHINES CORPORATION
代理人：Jeffrey S. LaBaw
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