How to lower I/O priority for file copying operations?

[starriol]

Whenever I copy files from a disk to another on my personal Linux system, the OS stops responding appropriately, the UI starts behaving erratically, any movies I'm playing will freeze and continue until the file transfer is done. I don't care if the transfer takes longer, I'd like to throttle it down.

I only copy files using Dolphin normally, so I'd need this system wide or at least be able to launch dolphin for this.

I tried "ionice -c 3 dolphin", it had the same problem.

I'm using Linux Mint KDE 16.

Thanks for any ideas.

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