www.thetoppersway.com Seminar On Rain Technology Submitted To: Submitted By: www.thetoppersway.com www.thetoppersway.com 1 1

Content Introduction Goal of Technology Architecture Features Advantages Applications Future Scope Conclusion Reference

INTRODUCTION The name of the original research project is RAIN which stand’s for Reliable Array of Independent Nodes. The RAIN technology originated in a research project at the California Institute of Technology (Caltech),in collaboration with NASA’s Jet Propulsion Laboratory and the Defense Advanced Research Projects Agency (DARPA). A component that stores data across distributed processors and retrieves it even if some of the processors fail. A communications component that creates a redundant network between multiple processors and supports a single, uniform way of connecting to any of the processors. A computing component that automatically recovers and restarts applications if a processor fails

Goals of Rain Technology RAIN Technology is able to offer the solution by minimizing number of nodes in the chain connecting the client and server. RAIN Technology making the exiting nodes more robust and independent of each other. RAIN Technology provides the feature of replacing a faulty node by a healthy one.

Architecture

Features of Rain Communication Group Membership Data Storage

FAULT TOLERANT INTERCONNECT TOPOLOGY The Problem How to connect n computing nodes in a ring of n switches?

A NAIVE APPROACH In this approach, we connect all the nodes to the nearest switch. A ring is 1-fault tolerant so, we can loose 1 switch without upset. A 2nd switch is failure can partition the network.

Diameter Construction dc=2 Here the nodes are connected to switches that are maximum distance apart from each other which is diameter in ring. Diameter construction with nodes of degree 2 connected to n switches of degree 4 can tolerate 3 fault without partitioning the network. Which is optimal. Diameter construction for n (a) odd (b) even

Group Membership The main function of group member is to tolerate the fault. Group member ensure that all processes maintain a consistent view of global membership. Token Mechanism:

Data Storage Fault tolerance in data storage across many disks is obtained using redundant storage schemes. Novel error-correcting codes have been developed for this purpose. These are array codes that encode and decode using simple XOR operations.

Advantages There is no limit on the size of a RAIN cluster. There is no concept of master-slave relation. A RAIN cluster can tolerate multiple node failure. This is highly efficiency in traffic management. New node can be added into the cluster to participate in load sharing. It work with many different intermit application.

Applications High Availability Video Server High Availability Web Server Distributed Check pointing Mechanism

Future Scope Development of API’s for using the various building blocks. The implementation of a real distributed file system using the partitioning scheme developed here. The group communication protocols are being extended to address more challenging scenarios.

Conclusion The goal of the RAIN project has been to build a test-bed for various building blocks that address fault management Communication and storage in a distributed environment. The creation of such building blocks is important for the development of a fully functional distributed computing system.

References www.thetoppersway.com www.wikipedia.com www.google.com

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