Section 2.5 talks about the crush hierarchy, but does not, at all, mention device-classes, but instead explains how we pinned pools to specific device collections, in the way we did prior to RHCS-3. We should emphasise on making use of the device-class notation. I pointed this out in a different doc, earlier in the year. It would be appropriate to look through all our RHCS doc's and make this update, across the board. Reported by: rh-ee-hemoller https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/6/html/object_gateway_guide/considerations-and-recommendations#annotations:5906feef-d4d1-4ced-9bf4-6b72a27058b6
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