1. A CopySet, as the basic unit of a consistent replication group, contains Consensus Module and Log Module. 2. The State Machine corresponds to the chunk in the CurveBS, and it applies the operations the CurveBS Client has been optimized to decouple the application from libcurve and add a NEBD module to join the two. l Nebdclient: Forward the requests from QEMU and curve-NBD to the specified processing flow CopysetNode is essentially a wrapper around the RAFT algorithm. The Copyset module encapsulates the RAFT Node of BRaft and implements the user state machine of BRaft. Take a write

parameter. If the number of pending * background requests exceeds this number, the FUSE kernel module will * mark the filesystem as "congested". This instructs the kernel to * expect that queued