Parity Sync / Preclear IO Quota


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It think it would be super useful to be able to limit the speed for long running I/O jobs using cgroups. 

 

For example, I want to preclear a disk that is shared in a jbod with my main array disks, however, the preclearing consumes almost all bandwidth leaving me with a very slow / unreliable experience. If I could limit the preclear IO to something like 50MB/s then it will leave me with a good headroom.

 

Another use case is when checking for parity or rebuilding a disk. 

 

Thanks.

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