I think your observations suggest that, to a first approximation, filling drives with bytes to the same absolute level is better for performance than filling drives to the same percentage full. Assuming random distribution of PGs, this would cause the smallest drives to be as active as the largest drives. E.g. if every drive had 1TB of data, each would be equally likely to contain the PG of interest. Of course, as more data was added the smallest drives could not hold more and the larger drives become more active, but at least the smaller drives would as active as possible.


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