RDMA Network Block Device driver client

modulename: rnbd-client.ko

configname: CONFIG_BLK_DEV_RNBD_CLIENT

Linux Kernel Configuration
└─>Device Drivers
└─>Block devices
└─>RDMA Network Block Device driver client
In linux kernel since version 5.1 (release Date: 2019-05-05)  
RNBD client is a network block device driver using rdma transport.

RNBD client allows for mapping of a remote block devices over
RTRS protocol from a target system where RNBD server is running.

If unsure, say N.

source code:
drivers/block//rnbd/