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* volume.balance: rank by physical disk usage * volume.balance: keep -byDiskUsage ranking on one scale across the fleet A server that does not report disk bytes ranks at whole volume-equivalents while reporting servers stay below 1.0, so during a rolling upgrade the balancer drains nearly empty old-build servers onto physically fuller ones. Decide the scale once: rank by physical used percent only when every server reports disk bytes, otherwise fall back to the data-size ranking for all. Normalizing the fallback by maxVolumeCount instead would reintroduce the over-configured-maxVolumeCount distortion this flag exists to avoid. --------- Co-authored-by: Chris Lu <chris.lu@gmail.com>