Simulating Byte-Addressable Storage on Block Devices

The patent introduces a staging area in kernel memory as an intermediary between the fast NVRAM logging interface and the slower disk storage. This staging area buffers modifying requests, allowing the system to achieve both fast NVRAM-like performance for logging and reliable disk persistence for actual data storage, thereby resolving the contradiction between persistence and writing speed.

The patent implements preliminary action by first logging modifying requests to the NVRAM staging area in the expected order before eventually writing to disk. The staging area maintains a log of changes in the order they occurred, and the system ensures that disk writes preserve this ordering by processing and persisting changes sequentially rather than concurrently, thus maintaining the precise order expected by NVRAM users while ensuring disk persistence.

The patent applies universality by designing the staging area to serve multiple functions: it acts as a buffer for fast logging, maintains change ordering, provides persistence guarantees, and interfaces with both NVRAM and disk storage systems. This multi-functional design consolidates what would otherwise require separate components into a single unified structure, improving performance while minimizing the increase in device complexity.