CurveBS I/O processing flow Before introducing IO processing flow, we first describe the overall architecture, data organization and topology structure of CURVE. CurveBS uses the central and hardware, the need for decentralization is not particularly strong in most cases. The CurveBS core consists of three parts: 1. Metadata Server (MDS) l Manages and stores metadata information snapshots/mirrors l Support rollback from snapshot CurveBS data organization Data organization of virtual block device in CurveBS1. CurveBS maps the virtual block device to a file. For example,