How to limit speed of file copy?

Question

I am copying huge file from NFS mount using dd:

dd if=/mnt/nfs/image.img of=/dev/sda

I need to limit the speed of reading from NFS. How can I achieve it? The only precondition is to use some easy compilable utility in order to put into my custom ram-only live linux distro.

Forget about dd. It would be simpler, less error-prone and faster to run cat /mnt/nfs/image.img >/dev/sda — Gilles 'SO- stop being evil', Aug 25 '15 at 23:48
Still I need to limit the speed becauseI have around 40 similar boxes copying from NFS and image is 2GB, thus killing NFS box and network. — Pablo, Aug 26 '15 at 05:58

score 6 · Answer 1 · edited Aug 25 '15 at 23:47

6

You could use pv:

</mnt/nfs/image.img pv -L 5m >/dev/sda

The -L flag limits the throughput to 5 megabytes per second. pv also writes to the stdout so you have to redirect to the target with >.

edited Aug 25 '15 at 23:47

Gilles 'SO- stop being evil'

829,060

answered Aug 25 '15 at 20:43

chaos

48,171

@Gilles Sure, thanks for the edit. =) Sometimes I think around too many corners, without seeing the obvious.. – chaos Aug 26 '15 at 05:29

How to limit speed of file copy?

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