Author Archives: ebl

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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Cephadm: migrate block.db/block.wal to new device

Posted on February 5, 2025 by ebl

A couple of years ago, before cephadm took over Ceph deployments, we wrote an article about migrating the DB/WAL devices from slow to fast devices. The procedure has become much easier than it used to be, thanks to ceph-bluestore-tool (or … Continue reading →

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