How do i limit the bandwidth-usage while resyncing on RAID 1?

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Hello List,

while resyncing, the process takes the whole bandwidth from disk to disk.

This leads in a VERY unhappy situation, because the system on this raid is
unpractical slow now, because it has to wait for disk-io.

How can i tune this? I want somthing like "nice -n 19 dm-mirror" ;)

Kind regards, Florian
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