Placement Groups
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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.
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Ceph Pools, Placement Groups and CRUSH Rules Explained
Configure Ceph pool size, inspect PG autoscaler recommendations and change a pool's CRUSH rule, with failure-domain checks before and after changes.