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Distributed SystemDistributed System
IntroductionIntroduction
Distributed System
A distributed system consists of multipleautonomousautonomous computers that are linkedand that can—through software—give theappearance of being a single, integratedcomputer system. The individual computersmay be parts of a local, wide, or global areanetwork.
Distributed System
Examples of distributed systems abound,including the Internet, various Universitycomputing centres, and ATM (automaticteller machine) networks.
Distributed Systems
Several features and capabilities are considered desirable for distributed systems include:
- Resource sharingResource sharing. This refers tothe ability for users to share hardware(e.g. peripherals), application software (e.g., groupware), or data (e.g., reference materials).
Features of Distributed Systems
-ConcurrencyConcurrency
Refers to the fact that multiple users may be requesting or accessing system resources at the same time. Ideally, processors should be able to deal with multiple users simultaneously.
Distributed system automatically demonstrates concurrency each time two or more users do things at the same time on their own machines.
Features of Distributed Systems
-OpennessOpenness
An open system is one for which specifications and interfaces have been made public, so that developers can create products for the system.
An open system can easily handle new hardware or software configurations because there are officially accepted specifications.
Features of Distributed Systems
-TransparencyTransparency
Refers to the fact that a user doesn’t need to know that different resources being used maybe scattered all around the world.
For the user, there should be no significant difference between requesting a local resource and one at some remote location.
Features of Distributed Systems
- Scalability - Scalability
Refers to the ability of the system to grow—for example, through the addition of new computers or by the creation of internetworks.
When a distributed system grows, certain information may need to be duplicated at multiple locations in order to maintain the efficiency of the original, smaller system.
Features of Distributed Systems
- Fault toleranceFault tolerance
Refers to the system’s ability to continue functioning after one or more components become unavailable because of either hardware or software failure.
Features of Distributed Systems
In a fault tolerant system, a software failure will affect only the process or processes that failed.
Features of Distributed Systems
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ConclusionConclusion
