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The Network Block Device

Issue 73

From Issue #73
May 2000

May 01, 2000  By P. T. Breuer, A. Martín Lopez and Arturo García Ares
 in
A network block device (NBD) driver makes a remote resource look like a local device in Linux, allowing a cheap and safe real-time mirror to be constructed.
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throughput and availability

Anonymous's picture
Submitted by Anonymous (not verified) on Wed, 10/08/2008 - 08:49.

Sorry, got thrown off by those dd 's. Reading the summary, it is clear: you actually mount /mnt/remote, it doesn't matter whatever it is. But then, loks like you need to know the filesystem, when you mount it on /nd0 on the client!

throughput and availability

Anonymous's picture
Submitted by Anonymous (not verified) on Wed, 10/08/2008 - 08:40.

"so that we can route through a second network card on both machines and thus double the available bandwidth through our switched network."

Only if you are limited by the throughput of your NIC (say your network card is an old 10MBit/sec and your network can do 100MBit or better; otherwise "switched" means switched: you wait on one another, and what you gain is just this synchronization overhead.

The other thing that may be missing: how do you "publish" a partition you already have? I did not get it: the "remote" resource has to be dedicated only to the NBD, or can it be still available locally on the server? In other words, say, can I "publish" the /home directory ? Does it have to be a standalone partition then? or may I just publish some part of it, like through NFS or samba?

hi!!!I hope i can learn more

aineed's picture
Submitted by aineed (not verified) on Fri, 10/03/2008 - 02:39.

hi!!!I hope i can learn more about operating system..

The NBD document is really

Anonymous's picture
Submitted by Anonymous (not verified) on Mon, 02/05/2007 - 04:41.

The NBD document is really good.
But I have some doubts. Can you help me in understanding ,how NBD is different from iSCSI device?
Which will be better for performance NBD or iSCSI?

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