Cluster based Checkpointing Approach for Mobile Distributed Systems

Mobile Hosts (MHs) are increasingly becoming common in distributed systems due to their availability, cost, and mobile connectivity but large amount of checkpointed data are not stored on local MHs memory. The limited stable storage available in mobile environments can make traditional fault tolerance techniques unsuitable. Since storage on a mobile host is not considered stable, most protocols designed for these environments save the checkpoints on the base stations. Previous approaches have assumed that the base station always has sufficient space for storing checkpoints. If there is not enough storage available, checkpointing may need to be aborted. An adaptive fault tolerance protocol is described in this paper for manages storage effectively. In cluster based architecture, whole network is divided into several cells and each cell has a Base Station(BS). Cluster has more than one BS it. BSs are the nodes that are given the responsibility for routing the messages within the cell and performing the data aggregation. The communication between two adjacent cells are conducted through the Base Station.