Re: Migration from "classless pre luminous" to"deviceclasses" CRUSH.

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We had a MASSIVE data movement upon changing the crush rules to device
class based one. I'm not sure about the exact reasons, but I assume that
the order of hosts in the crush tree has changed (hosts are ordered
lexically now...), which resulted in about 80% of data being moved around.

What is you failure domain? Host I think?

This cluster failure domain is rack.



k

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