Placement Groups
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Ceph Show Pools: Commands to List and Inspect Pools
Ceph has no show pools command. Use ceph osd pool ls detail, ceph df and autoscale-status to list pools, read their settings and check usage.
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Ceph Minimum Hardware Requirements: Nodes, CPU, RAM, Network
Ceph needs at least 3 nodes, 4 GiB of RAM per OSD by default, 1 to 6 CPU threads per OSD, 1 TiB drives and a 10 Gb/s network. See how to size each.
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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.