I'm looking into building a CEPH cluster as a storage solution for our proxmox cluster.

It's unclear to me if I need to set up a metadata server too, because this is needed for CephFS but I think CephFS is not used for RBD, correct?

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    There are lots of openly available docs that coming the information you're looking for. There's a lot of additional information you'll find helpful as well. – Spooler Jan 27 '18 at 18:08

Yes, mds is only needed for cephfs. For rbd you only need mons, osds and mgrs.

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