I plan to migrate cluster from straw to straw2 mapping. Ceph and kernels is up to date (kernel 4.1.0), so I want to change directly in crush map srew to straw2 and load changed crush map (by steps - per host and rack). Are this relative safe and must be remapped runtime?

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WBR, Dzianis Kahanovich AKA Denis Kaganovich, http://mahatma.bspu.unibel.by/
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