Definition ∞ BFT System Redundancy refers to the practice of incorporating extra components into a Byzantine Fault Tolerant system to ensure continued operation despite failures. This involves duplicating critical system elements, such as nodes or data, so that if one fails or behaves maliciously, others can take over or provide corroborating information. The aim is to uphold the system’s integrity and availability by distributing the workload and providing backup capabilities. In blockchain technology, redundancy helps maintain consensus and data consistency even when a subset of validators experiences issues or attempts to subvert the protocol.
Context ∞ The deployment of BFT system redundancy is a fundamental design consideration for permissioned and some permissionless blockchains, directly impacting their resilience and uptime. Debates often focus on determining the optimal level of redundancy to achieve desired security properties without incurring excessive operational costs or performance degradation. Ongoing work seeks to develop more efficient redundancy schemes that minimize resource consumption while preserving strong fault tolerance.
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