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systems/ceph-cluster.md

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+---
+title: Ceph Cluster
+category: systems
+tags: [ceph, storage, rbd, ec-pool, osd]
+created: "2026-07-24"
+modified: "2026-07-24"
+---
+
+# Ceph Cluster
+
+## Übersicht
+- **14 OSDs** (HDD + NVMe/SSD混合)
+- **Health:** HEALTH_WARN (BlueFS spillover osd.8, slow ops, nearfull)
+- Läuft auf Proxmox PVE Hosts (integriert via pveceph)
+
+## Pools
+| Pool | Type | Usage |
+|------|------|-------|
+| ceph-flash | replicated | K8s CSI (fast storage) |
+| ceph-hdd | replicated | Bulk storage |
+| media_ec | EC k=4+m=1 | Media (photos, backups) |
+
+## Bekannte Probleme
+- **osd.0 NVMe** — 92% Wear, Critical Warning → Austausch planen
+- **osd.2/5** — 93-94% full → entlasten oder neue OSDs
+- **EC Pool k=4+m=1** — mit 5 OSDs kein Rebalance Headroom. Siehe Solution Doc: `docs/solutions/architecture/2026-07-12-ceph-ec-pool-no-rebalance-headroom.md`
+- **BlueFS Spillover** osd.8 — `ceph-bluestore-tool bluefs-bdev-expand --path /var/lib/ceph/osd/ceph-8`
+
+## CRUSH Topology
+- Device Classes: hdd, ssd, nvme
+- EC Pools benötigen Device-Class-Separation (mixed disk sizes → Anti-Pattern: artificially low weights)
+
+## RBD Management
+- Proxmox RBD Double-Mount Deadlock Pitfall: Niemals `pct mount` und `pct exec` gleichzeitig auf demselben Container
+- Siehe Solution Doc: `docs/solutions/bug-fixes/2026-07-23-proxmox-rbd-double-mount-deadlock.md`
+
+## Related Skills
+- `ceph-cluster-administration` (devops)
+
+## Related
+- [[systems/proxmox-cluster]]
+- [[systems/rke2-kubernetes]] (Ceph CSI)