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Scalable and fault-tolerant information systems like cloud systems are realized in server cluster systems. Server cluster systems are equipped with virtual machines to provide applications with scalable and fault-tolerant services. Scalable and fault-tolerant application services can be provided by balancing processing load among virtual machines to perform application processes. On the other hand,...
Various types of scalable and high performance computing systems are developed to realize distributed applications. In order to realize not only scalable but also high performance information systems, serverclusterc systems are widely used. In server cluster systems, the larger electric energy is consumed since application processes are performed on the larger number of servers. The improved delay...
Server cluster systems are widely used to realize high performance and fault-tolerant information systems. In order to make a server cluster fault-tolerant, multiple replicas of each application process are performed on multiple servers. However, the larger electric energy is consumed in a server cluster due to redundant execution of multiple replicas. The redundant power consumption laxity-based...
In order to realize high performance information systems, server cluster systems are widely used. Here, since application processes are performed on multiple servers, the larger electric energy is consumed in a server cluster. The delay time-based (DTB) algorithm is discussed to select a server for each request process so that the total energy consumption of a server cluster to perform application...
The improved power consumption laxity-based (IPCLB) algorithm is discussed to select one of servers so that the total power consumption of a cluster can be reduced. However, a load balancer has to collect a state of every current process on servers of a cluster to calculate the estimated power consumption of each server. In addition, it is difficult to precisely estimate the power consumption of each...
Application processes have to be not only fault-tolerantly but also energy-efficiently performed in presence of server faults in a cluster of servers. In our previous studies, the extended improved redundant power consumption laxity-based (EIRPCLB) algorithm is proposed where a process is actively replicated on multiple servers. While the cluster can be fault-tolerant, the larger amount of electric...
We have to reduce the total electrical power consumption in information systems. In this paper, we consider communication based applications where a server transmits a large volume of data to a client like file transfer protocol (FTP). We discuss a power consumption model for communication-based applications, where the total power consumption of a server depends on the total transmission rate and...
In order to realize eco societies, we have to reduce the total electrical power consumption in information systems. We classify network applications to transaction and communication based applications. While CPU resources of servers are mainly consumed in the transaction based ones, a large volume of data is transmitted by a server to a client in the communication based ones like file transfer protocol...
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