Erasure Coding
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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
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 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.