remove host from cluster for re-installing it

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Hello,

On my Octopus cluster with 6 nodes (3 mon/mgr, 3 OSD), I would like to re-install the operating system of the first mon/mgr node. For that purpose I tried "ceph host rm mynode" but then I got the following two health warnings:

            2 stray daemon(s) not managed by cephadm
            1 stray host(s) with 2 daemon(s) not managed by cephadm

So I did not proceed with the re-installation and added the node back.

What would be the correct command in order to do that? I can live with mon/mgr which are do not have the quorum for the time of the re-installation. I just need my CephFS to still be available. Right now there is 2 mon daemons running and 1 active mgr and 2 standby mgrs.

Thank you,
Mabi

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