Forgive me for saying this, but the philosophy for software defined storage such as CEPH and Gluster is that forklift style upgrades should not be necessary. When a storage server is to be retired the data is copied onto the new server then the old one taken out of service. Well, copied is not the correct word, as there are erasure-coded copies of the data. Rebalanced is probaby a better word.
Sorry if I am seeming to be a smartarse. I have gone through the pain of forklift style upgrades in the past when storage arrays reach End of Life. I just really like the Software Defined Storage mantra - no component should be a point of failure.
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