Storage Comparison — Ceph vs MinIO vs Longhorn
Canonical comparison of three major storage solutions for cloud-native infrastructure.
Quick Reference
| Dimension |
Ceph |
MinIO |
Longhorn |
| Type |
Unified (block + object + file) |
Object only (S3) |
Block only (K8s PVs) |
| Latest Version |
v20.2.1 "Tentacle" (Apr 2026) |
⚠️ OSS archived (Feb 2026) |
v1.11.1 (Apr 2026) |
| License |
LGPL 2.1/3.0 |
⚠️ AGPL 3.0 (OSS) / Commercial (AIStor) |
Apache 2.0 |
| Architecture |
Distributed RADOS cluster |
Distributed S3-native |
Per-volume K8s engine |
| Language |
C++, Python |
Go |
Go, C++ |
| CNCF |
N/A |
N/A |
Incubating |
| Scale |
Exabyte |
Exabyte (AIStor) |
TB–PB |
| Governance |
Community + Red Hat |
MinIO Inc |
CNCF / SUSE |
Storage Interface Coverage
| Interface |
Ceph |
MinIO |
Longhorn |
| Block (RBD/iSCSI) |
✅ RBD |
❌ |
✅ CSI |
| Object (S3) |
✅ RGW |
✅ Native S3 |
❌ |
| File (POSIX) |
✅ CephFS |
❌ |
❌ |
| NVMe-oF |
✅ (Tentacle) |
❌ |
❌ |
| SMB/CIFS |
✅ (Tentacle) |
❌ |
❌ |
Architecture Comparison
| Aspect |
Ceph |
MinIO |
Longhorn |
| Deployment |
Dedicated cluster (cephadm) |
Standalone or K8s |
K8s-only (DaemonSet) |
| Data placement |
CRUSH algorithm |
Erasure coding |
Synchronous replication |
| HA model |
MON quorum + OSD replication/EC |
Erasure coding |
Per-volume replicas (2-3) |
| Minimum nodes |
3 MONs + 3 OSDs |
4 (erasure coding) |
3 (for 3 replicas) |
| K8s integration |
Via Rook Operator |
Direct or via Operator |
Native CSI |
| Management |
cephadm, Dashboard |
mc CLI, Console |
Longhorn UI, kubectl |
Use Case Decision Matrix
| Use Case |
Recommendation |
| OpenStack / VM block storage |
Ceph — industry standard |
| Kubernetes PVs (small–medium cluster) |
Longhorn — simplest K8s storage |
| Kubernetes PVs (large cluster) |
Ceph (via Rook) — scales better |
| S3-compatible object storage |
Ceph RGW (OSS) or MinIO AIStor (commercial) |
| AI/ML data lakes |
MinIO AIStor (if commercial OK) or Ceph RGW |
| Shared file system |
Ceph (CephFS) — only option with POSIX |
| Edge / lightweight |
Longhorn — minimal resource footprint |
| Unified block + object + file |
Ceph — only unified option |
Operational Complexity
| Dimension |
Ceph |
MinIO |
Longhorn |
| Install complexity |
High (dedicated cluster) |
Low (single binary) |
Low (Helm chart) |
| Team expertise |
Storage engineering team |
DevOps / SRE |
Any K8s admin |
| Day-2 operations |
Heavy (OSD replacement, rebalancing) |
Light |
Light |
| Monitoring |
Dashboard + Prometheus |
Console + Prometheus |
UI + Prometheus |
⚠️ MinIO License Warning
MinIO's open-source repository was archived February 13, 2026. New deployments should evaluate:
- Ceph RGW for open-source S3-compatible object storage
- MinIO AIStor if commercial licensing is acceptable
- SeaweedFS or Garage as lightweight OSS alternatives
Sources
- Cross-validated via official docs and vendor blogs (April 2026)