OSD
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How to Add an OSD to Ceph Safely with cephadm
Add a Ceph OSD without wiping the wrong disk: verify health, inventory the device, dry-run an OSD spec, deploy it, and watch the rebalance.
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Ceph Erasure Coding vs Replication: How to Choose
How erasure coding and replication differ in space amplification, failure tolerance and write cost, with a k+m overhead table and a rule for picking one.
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Ceph Minimum Hardware Requirements: Nodes, CPU, RAM, Network
Learn why 3 nodes is the Ceph minimum, how many CPU threads and how much RAM each OSD needs, and the drive and 10 Gb/s network requirements.
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Ceph HEALTH_WARN: Diagnose and Clear Warnings
A triage order for Ceph HEALTH_WARN covering degraded placement groups, nearfull OSDs, missed deep scrubs, autoscaler alerts and monitor clock skew.