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The Eladr Protocol is a decentralized, security and efficiency enhanced Web3 noSQL database powered by IPFS as the data storage layer https://ipfs.io/, and the Cardano block chain as the rewards token platform, https://cardano.org/. It provides a JSON based, IPFS layer 2 solution for data indexing and retrieval in an 'append only' file system built with open source Node.js API libraries.

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UNIX-SYSTEMS-PROGRAMMING-AND-COMPILER-DESIGN-LABORATORY-10CSL68--->View question


Asked On2017-05-16 13:21:05 by:scribed

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Before looking in to fault tolerance lets look at on what is a fault is 

A fault in a system is some deviation from the expected behavior of the system: a malfunction. Faults may be due to a variety of factors, including hardware failure, software bugs, operator (user) error, and network problems.
There is two ways to deal with faults
Fault removal is an ex post facto approach where faults were encountered in the system and we managed to remove those faults. This could have been done through through testing, debugging, and verification as well as replacing failed components with better ones, adding heat sinks to fix thermal dissipation problems, et cetera.
Fault tolerance is the realization that we will always have faults (or the potential for faults) in our system and that we have to design the system in such a way that it will be tolerant of those faults. That is, the system should compensate for the faults and continue to function.
Methods to achieve  fault tolerance
1)Redundancy reduction 
2)Availability
3)Active replication
4)Agreement in faulty system
5)Examples of fault tolerance
6)ECC(Error correction code memory)
7)Machine failover via DNS SRV records
8)RAID 1 (disk mirroring)
9)RAID 4/RAID 5 (disk parity)

Answerd on:2016-11-28 Answerd By:scribed

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