NBD (Network Block Device) is a user-space network protocol for sharing block devices over a network. It allows a client machine to access a block device on a server machine as if it were a local disk. The NBD package provides a server and client implementation of the protocol. The package includes tools for creating and managing NBD devices, as well as a server that can export block devices over the network. The client can connect to the server and access the exported devices as if they were local. NBD is useful for a variety of use cases, including virtualization, cloud computing, and distributed storage systems.
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