Dependability Analysis of Digital Library Cloud Services with Load Sharing
Cloud service utilizes computing resources to store all of information on the Internet. It means that we can use the service anytime, in anywhere through a variety of IT equipment. For reliable operations of digital library cloud services, it is necessary
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Abstract. Cloud service utilizes computing resources to store all of information on the Internet. It means that we can use the service anytime, in anywhere through a variety of IT equipment. For reliable operations of digital library cloud services, it is necessary to ensure dependability. In this paper, we apply the cold standby, hot standby, and load sharing in the system and compare our system with existing systems to measure the availability and reliability of dependability characteristic. Keywords: Dependability Availability Redundancy strategy Load sharing
Reliability
Cloud computing
1 Introduction Cloud computing is an intangible form like clouds and it stores all of information from the user to the server on the Internet. And it includes an environment which ensures high availability in any time and in anywhere through various IT equipment. In a cloud computing environment, we can store data safely because data is stored on external servers. For example, Digital Library Service has an advantage due to its high connectivity at anywhere. Digital library is a collection of data stored on various media such as tapes, books, publications, PC, videos, and disks. Then, organizations/universities come up with Digital Library Service with their own materials for people to gain knowledge from it. Due to the expanding growth of information Digital Library has, dependability becomes more important. If the service is interrupted by an unexpected error, it can cause serious damages causing data loss/network failure. Furthermore, it is necessary to spend additional costs for data recovery, in some cases, may not be able to fully restore the data. Thus, in order to provide a consistent and reliable digital library service, it is necessary to study scheme that can improve the dependability characteristics like availability or reliability. Many researchers have measured the availability applying hot standby/cold standby in a cloud service environment [1]. However, considering that the application fields of cloud computing have been getting wider with increased users’ needs, the existing researches for the dependability are remarkably insufficient to fulfill user’s desired conditions. In this paper, we propose a load sharing strategy to enhance the dependability © Springer Nature Singapore Pte Ltd. 2017 J.J. (Jong Hyuk) Park et al. (eds.), Advances in Computer Science and Ubiquitous Computing, Lecture Notes in Electrical Engineering 421, DOI 10.1007/978-981-10-3023-9_133
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and measure the availability and reliability by comparing it with redundancy of conventional systems.
2 Models A. Dependability In recent years, dependability has emerged as major interest in various fields which requires construction of computing systems. Especially in particular areas where failures in the system can cause fatal problems, the system should possess the dependability. Dependability comprises availability, reliability, safety, maintainability, confidentiality and integrity. In this paper, we analyze availabili
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