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.

  • 1
    Forget about dd. It would be simpler, less error-prone and faster to run cat /mnt/nfs/image.img >/dev/sda Commented Aug 25, 2015 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
    Commented Aug 26, 2015 at 5:58

1 Answer 1


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 >.

  • @Gilles Sure, thanks for the edit. =) Sometimes I think around too many corners, without seeing the obvious..
    – chaos
    Commented Aug 26, 2015 at 5:29

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