M Shorfuzzaman et al. [3] proposed a modified version of [7], where the creation of replica is based on the dynamic adjustment of threshold value, as in [7], the threshold value is fixed. In [7], the efficiency of replica placement depends heavily on the selection of threshold value which determines the popularity of the data object. So [3] determines the threshold value dynamically after considering factors like access request arrival rate from the clients and the available storage capacity of the replica servers. Through this dynamic adjustment of the threshold, the tradeoff between the access latency and the storage capacity of the servers are balanced.