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High-performance computers have been in great demand for applications in different areas. The increase in the processing power of processors cannot solely satisfy our demand. Parallel computers are made to overcome this technology limitation. In the last decade, research topics on parallel computer using network-connected multicomputer have been studied extensively. A cost-efficient high-speed multicomputer system was built using the SCSI bus for the network connection, and it has been shown that it can reduce the communication overheads and hence increase the overall performance [5]. In order to build highly scalable multiple computers based on this design, we have to take into consideration of different network topologies. Since SCSI bus [2,3] possesses some unique properties, it induces some interesting properties on the design of the network topology. In this paper, we evaluate the performance of the large scale SCSI networks with linear and mesh structures.