MongoDB 3.0 introduces a new pluggable storage architecture, enabling users to extend the database with new capabilities and configure it for optimal use of specific hardware architectures. This approach reduces developer and operational complexity compared to running multiple databases. The new storage engine, WiredTiger, scales on modern, multi-CPU architectures, providing significant benefits in terms of lower storage costs, greater hardware utilization, and more predictable performance. WiredTiger offers higher write performance, up to 10x greater throughput for most write-intensive applications, while maintaining predictable low latency. Compression is also supported, reducing physical storage footprint by as much as 80% compared to the default MMAPv1 engine. The new architecture allows for creating multi-temperature storage models, balancing query latency with storage density and cost. Additionally, MongoDB replication automatically migrates data between primary and secondary replica set members, independent of their underlying storage format.