Performance Analysis of Multiple-Computer as Real Application Clusters (RAC) Based on Storage Area Network (SAN) Iyoga Don Frima Tarigan, Riri Fitri Sari Computer Engineering, Electrical Engineering Departement Faculty of Engineering, University of Indonesia. Kampus Baru UI Depok 16424, Indonesia Iyoga.don@alumni.ui.ac.id, riri@ui.ac.id Abstract— Real Application Cluster (RAC) is a method to design a network that is used in large scale database that can handle full service all year round. RAC allows the pooling Server nodes in parallel and improve the Performance of each Server to be faster. RAC runs in multiple-computer. RAC was implemented with the support of Storage Area Network. Storage Area Network (SAN) is a high-speed dedicated network consisting of Servers and Storage. In general, SAN is connected via Fibre Channel (FC), UTP cable was used in implementation. Storage Area Network (SAN) was applied in clustering blocks device for high availability. Each block device will backup each other. SAN primary goal is to handle the density of large amounts of data between servers and storage without reducing the bandwidth available on the LAN/WAN. At the time of the implementation the SAN Integration with RAC produces Real Application Cluster based the Storage Area Network. The integration uses three computers (hardware), DRBD package and Management Console (MC). Based on the results obtained by testing the availability (ratio of the number package received by the number of package sent) is 100%. While the Clustering Performance obtained is 100% (The SAN’s Performance 93.396%, The Main and Cluster Server Performance 29.4945%). Keyword— Real Application Cluster, Server, multiple-computer, Storage area network, high Performance dan high availability INTRODUCTION The needs and demand of the modern application era changed in the sense it is not only requires computing resources (processing power, memory or disk space), but also the ability to remain available to handle user requests service almost continuously all year. The Needs and demand of today's research applications [7]. This research depends on some materials including the performance of the client and server computers, data transfer speed (Read/Write), and compatibility of hardware and software. The design of the computer usage in relation to the Cluster Server is the server’s capability to share the performance of a number of servers (multiple) in one process. If single server was used, no guarantee the server will always active. Therefore, it takes a cluster method to deal with such matters, so that when one server fails (down-time, offline, or failure) then the Server failover occurred in the set-up Cluster Server. Cluster servers are typically built with a different area so that the main Server for remote access can use the method of storage area network (SAN). To integrate the SAN with Real Application Clusters (RAC) method based Storage Area Network (SAN). RAC works in high availability, which means the demand data will be directly addressed by all servers in the node RAC to work together [1]. RAC was designed to run on multiple-computer. Multiple- computer usually built by servers that is far from each other. For example, the Main Server was in Jakarta, while Cluster server was in Bandung, Yogyakarta, Medan and Surabaya. RAC is the course to support the necessary method of SAN. SAN’s advantage is that every server can be accessed remotely with the best reliability. The program supported by the operating system will allow the Main and Cluster Server to share files [5]. SAN is a very high speed networks, consists of Server and Storage. Separate and distinct from the corporate LAN or WAN, SAN primary purpose is to handle large amounts of data traffic between servers and storage equipment, without reducing the bandwidth available on the LAN or WAN. Usually connected via Fiber Channel, a technology is very high-speed data communications, making SAN’s a dedicated network that is platform-independent operating behind the Server. SAN consists of communications infrastructure, which provides physical connections, and layers of management, which control connection, storage element, and the computer system so as to produce a highly secure data transfer and reliable. LITERATURE STUDY REAL APPLICATION CLUSTER (RAC) ON STORAGE AREA NETWORK (SAN) In this section some basic theory used in the implementation of this system. 2.1 Multiple-Computer Cluster Multiple-Computer Cluster is a collection of some servers which are connected to each other to form a single entity (Cluster). Computer cluster task is currently running to share