> I was wondering how exactly you accomplish that?
> Can you do this with a "ceph-deploy create" with "noin" or "noup" flags
> set, or does one need to follow the manual steps of adding an osd?

You can do it either way (manual or with ceph-deploy). Here are the
steps using ceph-deploy:

1. Add "osd crush update on start = false" [0] to your ceph.conf
2. Use "ceph-deploy osd prepare <hostname>:<disk>:<journal> ...

This will configure the OSD but not add it into the CRUSHMap, which
then can be done late as Wido suggested.

Best,
Martin

[0] 
http://docs.ceph.com/docs/jewel/rados/operations/crush-map/#ceph-crush-location-hook
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