Consistency, Availability, and Fault tolerance are the primary requirements at storage in a distributed environment. Besides these requirements storage efficacy and security in terms of confidentiality are also equally important. The traditional approach to achieve primary requirements is replication for data redundancy. Redundancy using replication provides high rates of availability at the cost of security and storage efficacy. This paper explores the possibility of incorporating dual quorum protocol, which provides availability, strong consistency and reasonable disk access time, with dispersal, to satisfy the additional requirements of security and storage efficiency at nominal cost. The performance of Dual quorum dispersal with respect to availability, errors, erasures and disk space is evaluated in comparison with Dual quorum incorporated for replication. Dual quorum dispersal outperforms Dual quorum replication in several functionalities like disk access time, security storage efficiency etc. On the other hand Dual quorum replication performs better when availability is considered. For applications that require space efficient, secure, error and erasure tolerant system which makes use of interleaved read and write workloads, Dual quorum-dispersal is an attractive choice and this is reinstated with the analyzed results. © Research India Publications.
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Dr. Shyamala C. K. and Vidya, N. V., “Dual quorum-dispersal, A novel approach for reliable and consistent ECC based storages”, International Journal of Applied Engineering Research, vol. 10, pp. 6901-6917, 2015.