Distributed Systems. 2. Enhancing Services by replicating data. PerformanceWhen a distributed system needs to scale in numbers and geographical area, performance can be improved by replicating servers. Fault ToleranceUnder the fail-stop model, if up to N of N 1 servers crash, at least one remains to supply the service. Increased AvailabilityService may not be available when servers fail or when the network is partitioned..