crush rule min_size

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Hi,

The crush rule min_size property is easily confused with pool min_size.
One could imagine a data loss scenario where an operator "fixed" a
misconfigured cluster by setting the crush rule min_size to 2 (but
left a pool min_size at 1).

Should we rename one of them (... the crush one)? ... e.g. min_osds/max_osds ?

Going further, do we even have a use-case for manually changing a
crush_rule's min_size/max_size. Could we simply hide them and hardcode
internally to min_size=1 and max_size=100?

Cheers, Dan
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