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The design and implementation of a scalable, fault tolerant, heterogeneous and secured distributed storage framework named SCAVENGER, which aggregates the free storage spaces of the personal computers, is presented in this paper. The datasets are fragmented and stored with enough replication in different systems. The design includes a SCAVENGER protocol suite to monitor the activities like joining of new system, data storage, data retrieval and system failures. Multiple managers are used to make the design scalable. A synchronization protocol is designed to synchronize the data among the multiple managers. A model for fault tolerance is also designed based on the parameters like blackout time, overlap time, latency, trust, load, replication and redundancy.
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