Category Archives: cephadm

Cephadm: Change OSD service specification

Posted on February 4, 2026 by ebl

The Ceph “Tentacle” version (v20.2.0) has been released a couple of weeks ago, and I just discovered a new command for the orchestrator: tentacle:~ # ceph orch osd set-spec-affinity <new_spec> <osd_id> But what is the purpose of this command? One … Continue reading →

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Cephadm: PG Imbalance

Posted on May 13, 2025 by ebl

You get the most out of Ceph if you have a balanced cluster, meaning your PGs are well balanced across the OSDs. I’m not going into more detail about the advantages of a balanced cluster, there’s plenty of information in … Continue reading →

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Cephadm: Activate existing OSDs

Posted on February 6, 2025 by ebl

A frequent question in the community is, what do I need to do when the operating system of one of my Ceph servers fails, but the OSDs are intact? Can I revive it? The answer is yes! And it’s quite … Continue reading →

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