DHT based p2p systems are appeared to provide scalable storage services with idle resource from many unreliable clients. If a DHT is used in storage intensive applications where data loss must be minimized, quick replication is especially important to replace lost redundancy on other nodes in reaction to failures. To achieve this easily, the simple replication method directly uses the consistent set such as the leaf set and the successor list. However, this set is tightly coupled to the current state of nodes and the traffic needed to support this replication can be high and bursty under churn. This paper explores efficient replication methods that only glimpse the consistent set to select a new replica. We propose two types of replication methods : Quorum based replication and Availability based replication. The replicas are loosely coupled to the consistent set and can eliminate the compulsory replication under chum. Results from a simulation study suggest that our methods can reduce network traffic enormously and achieve high data availability in a DHT based p2p storage system.