Tag Archives: cephadm

Cephadm: Recover mon store using OSDs

Posted on June 28, 2026 by ebl

A few weeks ago I helped a Ceph user to recover his broken cluster (see this thread). Basically, after his Monitors stopped working he re-deployed a new cluster with the same Ceph FSID and attached the existing OSDs to the … Continue reading →

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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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