Hi Laurent & Mehdi, I tried to translate our discussions about how to choose the number of placement groups into a revision of the documentation. Here is how it looks at the moment:
https://github.com/dachary/ceph/blob/9177da52f7aa358484f4d9074522da21c9336e49/doc/rados/operations/placement-groups.rst and the corresponding pull request is at https://github.com/ceph/ceph/pull/2417 This is a draft and I would very much appreciate your comments. I cc the Ceph development list because it is entirely possible that something significant is missing. Someone knowledgeable will hopefully rectify my mistakes ;-) Cheers -- Loïc Dachary, Artisan Logiciel Libre
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