On 04/12/2018 10:58 AM, ?? ? wrote:
Yes, according to crush algorithms, large drives are given high weight, this is 
expected. By default, crush gives no consideration of each drive's performance, 
which may cause the performance distribution is not balanced. And the highest 
io util osd may slow down the whole cluster.

You can control 'how much use' drive via adjusting crush weights.

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