High-Availability Scheme for Shared Servers of Cluster Systems Using Commands Transfer

Yuzuru MAYA  Soichi ISONO  Akira OHTSUJI  

IEICE TRANSACTIONS on Information and Systems   Vol.E83-D   No.5   pp.1073-1081
Publication Date: 2000/05/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Computer Systems
cluster system,  parallel computer,  hot-standby system,  high-availability,  

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For cluster systems consisting of multiple processing nodes and shared servers which consist of an on-line and a backup shared server, we propose a hot-standby scheme for shared servers. In this scheme for shared servers, when the on-line shared server receives a command from a node, it sends only an update command and its data identifier to the backup shared server. Both the on-line and the backup shared server execute the update command independently, and the command result of the on-line shared server is identical to that of the backup shared server. When the on-line shared server fails, the backup reconstructs the shared data by using its own shared data and the user data from each node. We evaluated the system recovery time and the performance overhead for this hot-standby scheme. It enables the performance overhead to be ignored, and the system recovery time to be shortened to 20 seconds in cluster systems.