The process of manually removing an OSD from your ceph cluster, as documented on the current, official ceph docs (Luminous release as of this writing) will result in data being re-balanced twice. Luckily Sébastien Han told us how to do it correctly on his blog in 2015. This is mainly a rehash of what he said (so I can always find it) with minor updates. Note, this is for planned disk removal, not post-failure. Continue reading “Manually Removing an OSD From Your Ceph Cluster (without moving all your data multiple times)”
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