[Beowulf] Lustre Upgrades

[John Hearns]

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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