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While the sourceforge site for userspace NBD still exists, the code repository moved to github several years ago. Then with a recent patch[1], the github landing page contains just as much information as the sourceforge page, so we might as well point to a single location that also provides the code. [1] https://lists.debian.org/nbd/2023/03/msg00051.html Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Link: https://lore.kernel.org/r/20230410180611.1051618-5-eblake@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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==================================
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Network Block Device (TCP version)
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==================================
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1) Overview
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-----------
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What is it: With this compiled in the kernel (or as a module), Linux
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can use a remote server as one of its block devices. So every time
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the client computer wants to read, e.g., /dev/nb0, it sends a
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request over TCP to the server, which will reply with the data read.
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This can be used for stations with low disk space (or even diskless)
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to borrow disk space from another computer.
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Unlike NFS, it is possible to put any filesystem on it, etc.
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For more information, or to download the nbd-client and nbd-server
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tools, go to https://github.com/NetworkBlockDevice/nbd.
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The nbd kernel module need only be installed on the client
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system, as the nbd-server is completely in userspace. In fact,
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the nbd-server has been successfully ported to other operating
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systems, including Windows.
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A) NBD parameters
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-----------------
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max_part
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Number of partitions per device (default: 0).
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nbds_max
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Number of block devices that should be initialized (default: 16).
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