GitHub user wido closed the discussion with a comment: Best practices for using 
Ceph with CloudStack (RBD vs NFS integration)

The advise is still to keep the Secondary as NFS and Primary for RBD.

RBD is awesome, but the SSVM wants to perform a lot of posix filesystem 
operations on the SS, things Ceph can't do. Theoretically CephFS could be used, 
but this would require the SSVM to have all the tools available.

My advice: Keep a NFS server around for your SS.

GitHub link: 
https://github.com/apache/cloudstack/discussions/11756#discussioncomment-14553574

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