چکیده (انگلیسی):

Distributed system rely on replication techniques to tolerate data failure and site disconnection thus
ensur-ing flexibility of the system so as to preserve its dependability. The idea of replication is robust
however practical implementation of the replication techniques is often rigid that would bring down
system’s de-pendability and performance. This study intended to evaluate existing techniques and then
develop a new technique which later will be compared with the existing with the goal of to achieve
better fault tolerance, dependability and performance in distributed systems. The new technique is
constructed based on circular neighbor relationship and quorum-based protocol. The consistency and
integrity of the replicated data that involved write and read operations on the replicas is ensured using
Replica maintenance protocol. This techniques focused on synchronous solution as for its quorum
execution or commitment protocol showed higher reliability and convenience to avoid conflicts
compared to asynchronous solution.