Hi Anthony, Actually, ceph-bluestore-tool and other useful tools are embedded in the ceph container image (even tools like smartctl), so the only command the operator might want to have on a host is cephadm, installed either from cephadm package when available, or downloaded via curl/wget, or the operator could just chmod +x /var/lib/ceph/$(ceph fsid)/cephadm.* that is pushed by the orchestrator on every node and run it. Cheers, Frédéric. -- Frédéric Nass Ceph Ambassador France | Senior Ceph Engineer @ CLYSO Try our Ceph Analyzer -- https://analyzer.clyso.com/ https://clyso.com | frederic.nass@clyso.com Le jeu. 23 avr. 2026 à 03:06, Anthony D'Atri via ceph-users < ceph-users@ceph.io> a écrit :

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On Apr 22, 2026, at 12:04 PM, Jacek Rużyczka via ceph-users < ceph-users@ceph.io> wrote:

Hi Eugen, Hi Frédéric,

One after the other, please:

Do you have the ceph-osd package installed on the servers? It's known

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to be a potential issue when trying to use cephadm while ceph packages are installed (except for cephadm, of course, and maybe ceph-common).

My understanding is that the orchestrator uses a different copy of cephadm than what the package installs, in order to avoid conflicts.

Issues with `ceph-osd` installed are problematic, though, as that's neeed to get ceph-bluestore-tool. Is there a tracker for this?

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And just one thought on the number of monitors: It's not useful to

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have 4 MONs, an odd number is recommended. With 4 MONs you'd still lose quorum when two MONs go down, so it doesn't offer any more resiliency than 3 MONs.

Shall I reduce it to 3?

If you have at least 5 hosts, I would increase to 5.

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