Delta: Highly available, strongly consistent storage using chain replication (2022)

Meta’s Delta storage service is a deliberately simple, highly available, strongly consistent object store built for critical bootstrap and disaster-recovery workloads, where reliability and recoverability matter more than latency or storage efficiency. Strategically, it shows that for foundational infrastructure, organizations may benefit from purpose-built systems with fewer dependencies and simpler failure handling rather than general-purpose platforms optimized for cost or throughput. For IT organizations, the key implication is to reserve highly resilient, low-complexity storage architectures for the assets that keep the rest of the environment recoverable and operational during major outages.