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Documentation / blockdev / nbd.txt




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Based on kernel version 4.1. Page generated on 2015-06-28 12:08 EST.

1	Network Block Device (TCP version)
2	==================================
3	
4	1) Overview
5	-----------
6	
7	What is it: With this compiled in the kernel (or as a module), Linux
8	can use a remote server as one of its block devices. So every time
9	the client computer wants to read, e.g., /dev/nb0, it sends a
10	request over TCP to the server, which will reply with the data read.
11	This can be used for stations with low disk space (or even diskless)
12	to borrow disk space from another computer.
13	Unlike NFS, it is possible to put any filesystem on it, etc.
14	
15	For more information, or to download the nbd-client and nbd-server
16	tools, go to http://nbd.sf.net/.
17	
18	The nbd kernel module need only be installed on the client
19	system, as the nbd-server is completely in userspace. In fact,
20	the nbd-server has been successfully ported to other operating
21	systems, including Windows.
22	
23	A) NBD parameters
24	-----------------
25	
26	max_part
27		Number of partitions per device (default: 0).
28	
29	nbds_max
30		Number of block devices that should be initialized (default: 16).
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