Abstract Grids enable sharing, selection and aggregation of geographically distributed resources among various organizations. They are now emerging as promising computing paradigms for resource and compute intensive scientific workflow applications modeled as a Directed Acyclic Graph (DAG) with intricate inter-task dependencies. Job scheduling is an important and challenging issue in a grid environment. There are various scheduling algorithm proposed for grid environments to distribute the load among processors and maximize resource utilization while reducing task execution time. Task execution time is not the only parameter to be improved; various Quality of Service (QoS) parameters are also to be considered in job scheduling in grid computing. In this Research we have studied the existing QoS based Task scheduling, work flow scheduling and formulated the problem. The possible solutions are developed for the problems identified in existing algorithms. The scheduling of dependent task (work flow) is more challenging than independent task scheduling. The scheduling of both dependent and independent tasks with satisfying QOS requirements of users is a very challenging issue in grid computing. This paper proposes a Novel Network aware QoS workflow scheduling method for Grid Services. The proposed scheduling algorithm considers network and QoS constraints. The goal of the proposed scheduling algorithm is to implement the workflow schedule so that it reduces execution time and resource cost and yet meets the deadline imposed by the user. The experimental result shows that the proposed algorithm improves the success ratio of tasks and throughput of resources while reducing makespan and workflow execution cost.

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[21] Zhao H. and Sakellariou R., Advance Reservation Policies for Workflows, in Proceedings of Job Scheduling Strategies for Parallel Processing, Saint-Malo, pp. 47-67, 2007. A Network Performance Aware QoS Based Workflow Scheduling for Grid Services 903 Shinu John is a Professor in the department of Computer Science and Engineering at the St. Thomas College of Engineering and Technology, Kannur, India. He obtained his Ph. D. from Anna University, Chennai. He received his M.E. and B.E. degrees in Computer Science and Engineering from Anna University, India and the M.S. University, Tirunelveli, India respectively. He is a member of the System Software Group at MAM College of Engineering, India and has published many papers in various national, international journals and conferences. His research interests include Grid Computing, Mobile Computing and Computer Networks. He is a life member of Computer Society of India, the Indian Society for Technical Education (ISTE), Institution of Engineers and a member of IEEE since 2006. Maluk Mohamed obtained his Ph.D. from the Indian Institute of Technology (IIT) Madras in 2006, Masters in Engineering from the National Institute of Technology, Tiruchirappalli in 1995 and Bachelors from the Bharathidasan University in 1993. He is currently a professor in the Department of Computer Science and Engineering, M.A.M. College of Engineering, India. He coordinates research activities for the System Software Group at MAMCE. His research interests include distributed computing and its family ie; grid computing, mobile computing, cloud computing and wireless sensor networks, software engineering and distributed databases. He has guided 5 Ph. D, 1 M.S. (By research) and 32 M. Tech., scholars and is currently guiding 5 Ph.D., and 3 M. Tech., research scholars. He is a member of the Board of Studies, in Anna University and JNTU Anantapur. He is the principal investigator for a number of funded projects like Cyberspace Security and Cloud API.