91 lines
3.7 KiB
Markdown
91 lines
3.7 KiB
Markdown
---
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title: Ceph Cluster
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category: systems
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tags: [ceph, storage, rbd, ec-pool, osd]
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created: "2026-07-24"
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modified: "2026-09-26"
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---
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# Ceph Cluster
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## Overview
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- **Cluster ID**: 204c8171-e0b1-4f40-9de2-a7cfe4ef68d9
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- **Health**: HEALTH_WARN — "Monitors are configured to allow creation of insecure key types" (cosmetic, CVE-2025-30156 fixed)
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- **Version**: 20.2.4 (tentacle) — all 17 OSDs
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- **Nodes**: 8 Proxmox hosts (proxmox2 removed from CRUSH), 4 MONs (proxmox5, proxmox4, ms-a2-1, n5pro), MGR on n5pro (standbys: px5/6/7/a2-1)
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- **OSDs**: 17 (10 HDD, 7 SSD), all up/in
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- **Capacity**: ~33 TiB total, 9.0 TiB used, 24 TiB avail
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- **Pools**: 13 pools, 533 PGs (532 active+clean, 1 scrubbing)
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## OSD Layout
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| OSD | Class | Size | Host | Reweight | Notes |
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|-----|-------|------|------|----------|-------|
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| 1 | hdd | 3.7 TiB | n5pro | 1.0 | |
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| 2 | ssd | 1.8 TiB | ubuntu | 1.0 | Moved to ubuntu host |
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| 3 | ssd | 233 GB | proxmox4 | 1.0 | |
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| 4 | ssd | 227 GB | proxmox3 | 0.30 | Small, reweighted down |
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| 5 | ssd | 150 GB | proxmox5 | 0.30 | Small, reweighted down |
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| 6 | hdd | 3.6 TiB | n5pro | 1.0 | |
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| 7 | hdd | 931 GB | proxmox7 | 0.95 | |
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| 8 | hdd | 3.6 TiB | ubuntu | 1.0 | |
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| 9 | ssd | 1.9 TiB | n5pro | 1.0 | |
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| 10 | hdd | 931 GB | proxmox6 | 0.95 | |
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| 11 | hdd | 2.8 TiB | n5pro | 1.0 | |
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| 12 | ssd | 1.9 TiB | n5pro | 1.0 | |
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| 13 | ssd | 1.8 TiB | ms-a2-1 | 0.95 | |
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| 14 | ssd | 1.8 TiB | ms-a2-2 | 0.95 | |
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| 15 | ssd | 1.8 TiB | ubuntu | 1.0 | New |
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| 17 | hdd | 3.6 TiB | ubuntu | 1.0 | New |
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| 18 | hdd | 3.6 TiB | ubuntu | 1.0 | New |
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> OSDs 0+2 (old proxmox2) destroyed 2026-07-25. osd.2 reassigned to ubuntu host as new SSD.
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> OSDs 15, 17, 18 added since last wiki update (ubuntu host expanded).
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## Pools
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| Pool | Name | Type | Size | Min | CRUSH Rule | PGs | Notes |
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|------|------|------|------|-----|------------|-----|-------|
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| 1 | cephfs_data | replicated | 3 | 2 | 0 (any) | 32 | autoscale off |
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| 2 | cephfs_metadata | replicated | 3 | 2 | 2 (ssd) | 32 | autoscale off |
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| 3 | vm_disks | replicated | 3 | 2 | 2 (ssd) | 128 | autoscale on |
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| 4 | .mgr | replicated | 3 | 2 | 2 (ssd) | 1 | |
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| 5 | rbd | replicated | 3 | 2 | 1 (hdd) | 32 | autoscale on |
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| 6 | hdd_disk | replicated | 3 | 2 | 1 (hdd) | 112 | nopgchange=true |
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| 7 | tm_disks | replicated | 2 | 2 | 1 (hdd) | 128 | target_size 2TiB |
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| 8 | media_ec | erasure 4+1 | 5 | 4 | 3 (hdd, osd-level) | 128 | ec_overwrites |
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| 9 | media_meta | replicated | 3 | 2 | 0 (any) | 32 | |
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| 10 | .rgw.root | replicated | 3 | 2 | 0 (any) | 1 | |
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## CRUSH Rules
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- **Rule 0** (replicated_rule): default root, host-level placement
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- **Rule 1** (replicated_hdd): default~hdd, host-level placement
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- **Rule 2** (replicated_ssd): default~ssd, host-level placement
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- **Rule 3** (media_ec): default~hdd, OSD-level placement (choose_indep)
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## Known Issues
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### HEALTH_WARN: Insecure Key Types (2026-09-26)
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Monitors allow insecure key types. Cosmetic warning — CVE-2025-30156 already fixed in 20.2.4.
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Fix: `ceph config set mon mon_allow_insecure_global_id_reclaim false` (if not already set).
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### Small SSDs causing reweightdown
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osd.4 (227GB, proxmox3) and osd.5 (150GB, proxmox5) reweighted to 0.30 — too small for meaningful capacity.
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Consider removing from CRUSH or replacing with larger drives.
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### worker-04 (VM 139) NotReady in K8s
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Node offline — not a Ceph issue but affects Ceph CSI attachments.
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## Access
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- SSH to Proxmox hosts: `ssh -i ~/.ssh/id_ed25519_proxmox root@10.0.20.50`
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- Ceph commands: `ceph status`, `ceph osd tree`, `ceph pg dump pgs`
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- Mon nodes: proxmox5 (leader), proxmox4, ms-a2-1, n5pro
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- Mgr: n5pro (active)
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## Related Skills
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- `ceph-cluster-administration` (devops)
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## Related
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- [[systems/proxmox-cluster]]
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- [[systems/rke2-kubernetes]] (Ceph CSI)
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