Hi cephers.
I have typical double root crush - for nvme pools and hdd pools created on Kraken cluster (what I mean: http://cephnotes.ksperis.com/blog/2015/02/02/crushmap-example-of-a-hierarchical-cluster-map).
Now cluster upgraded to Luminous and going to devices classes crush rules and I looking for experience.
1. Enable new crush rule with devices-class is safe for data and clients? 2. How much data movement? Should I be ready for slow requests? k
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