How to calculate the nearfull ratio ?

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Hi,

In a cluster where the failure domain is the host and dozens of hosts, the 85% default for nearfull ratio is fine. A host failing won't suddenly make the cluster 99% full. In smaller clusters, with 10 hosts or less, it is likely to not be enough. And in larger clusters 85% may be too much to reserve and 90% could be more than enough.

Is there a way to calculate the optimum nearfull ratio for a given crushmap ?

Cheers

-- 
Loïc Dachary, Artisan Logiciel Libre
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