BlackStor vs Ceph
Enterprise Storage Comparison
90% of OpenStack providers rely on Ceph for block storage. PROZETA built BlackStor — a proprietary high-performance storage engine — because enterprise workloads demand better. This comparison covers IOPS, P99 latency, rebuild times, OpenStack Cinder integration, and when each solution makes sense.
Why does storage choice matter for OpenStack deployments?
Storage is the foundation of any cloud platform. In OpenStack environments, block storage (Cinder) directly impacts the performance of every virtual machine, database, and application running on the platform. The difference between a well-performing and a poorly-performing storage backend can mean the difference between sub-millisecond database queries and multi-second response times.
Ceph has become the default storage choice for OpenStack because it's open-source, well-integrated, and handles both block and object storage. However, Ceph's general-purpose distributed architecture introduces inherent performance trade-offs — particularly for latency-sensitive enterprise workloads. Ceph's CRUSH algorithm, data replication overhead, and recovery behavior can cause significant performance variability under production load.
PROZETA developed BlackStor after years of running OpenStack for enterprise customers who needed better storage performance than Ceph could deliver. BlackStor is purpose-built for OpenStack Cinder block storage, optimized for NVMe SSDs, and designed to deliver consistent, predictable performance under all conditions — including during failure recovery.
How does BlackStor performance compare to Ceph?
Performance and feature comparison based on enterprise workload benchmarks with equivalent NVMe SSD hardware.
| Feature | PROZETA BlackStor | Ceph (Reef/Squid) |
|---|---|---|
| Architecture | Purpose-built block storage | General-purpose distributed |
| 4K random read IOPS | 200K-500K/node | 40K-120K/node |
| 4K random write IOPS | 150K-400K/node | 30K-80K/node |
| P99 read latency | <1ms | 5-15ms |
| P99 write latency | <2ms | 10-30ms |
| Rebuild time (8TB node) | 30-60 min | 4-12 hours |
| Performance during rebuild | Near-full | Significant degradation |
| OpenStack Cinder integration | Native (optimized) | Native (standard) |
| Thin provisioning | ||
| Snapshots | ||
| Replication | Synchronous | Configurable (2x/3x) |
| Object storage (S3) | ||
| Filesystem (CephFS) | ||
| Open-source | ||
| Self-managed option | ||
| Tail latency consistency | Excellent | Variable |
| NVMe optimization | Purpose-built | Partial (BlueStore) |
Why does BlackStor deliver higher IOPS than Ceph?
The IOPS advantage comes from architectural differences. Ceph is a distributed storage system designed for flexibility and scale-out. Every I/O operation traverses Ceph's CRUSH placement algorithm, potentially crosses network boundaries for replication, and passes through multiple software layers (BlueStore, OSD daemon, RADOS). This architecture is excellent for large-scale distributed deployments but introduces overhead for each I/O operation.
BlackStor takes a different approach. It is purpose-built for block storage, optimized for local NVMe SSD access paths, and minimizes the software layers between the application and the storage medium. Replication is handled synchronously with minimal overhead, and the I/O path is optimized for the specific access patterns common in enterprise virtualization workloads (database pages, VM disk I/O, log writes).
For enterprise customers running databases (PostgreSQL, Oracle, MSSQL), ERP systems (SAP), or real-time applications, the 3-5x IOPS improvement and dramatically lower P99 latency translate directly into better application performance, faster query execution, and more responsive user experiences.
When should you choose BlackStor and when Ceph?
Choose BlackStor when:
- + Low-latency block storage is critical (databases, ERP)
- + You need consistent P99 latency under 2ms
- + Fast rebuild times are important for data safety
- + You want a managed OpenStack platform (PROZETA Tier5)
- + Performance predictability matters more than flexibility
- + Enterprise workloads with strict SLA requirements
Choose Ceph when:
- ~ You need object storage (S3-compatible) alongside block
- ~ You require shared filesystem access (CephFS)
- ~ Multi-datacenter distributed storage is needed
- ~ Open-source with self-management is a requirement
- ~ Budget is the primary constraint
- ~ You have strong in-house Ceph expertise
What is PROZETA's experience with enterprise storage?
PROZETA has been building and operating enterprise storage systems since 2016 as part of our OpenStack infrastructure. We initially deployed Ceph and operated it in production for several years, gaining deep expertise in its architecture, tuning, and limitations. Our decision to build BlackStor was driven by real customer requirements that Ceph couldn't meet — particularly in the areas of consistent latency and rebuild performance.
Today, BlackStor powers all PROZETA Tier5managed OpenStack deployments. Our customers in regulated industries (gaming, HR tech, telecom) rely on BlackStor's performance for mission-critical workloads including real-time event processing, production databases, and high-throughput application backends.
For customers who specifically need Ceph (for object storage or self-managed scenarios), we also offer Ceph-based configurations within our BlackStor platform. We believe in recommending the right tool for each use case rather than forcing a single solution.
Frequently asked questions: BlackStor vs Ceph
Technical answers for infrastructure architects evaluating enterprise storage solutions for OpenStack.
Related: BlackStor · PROZETA Tier5 · Proxmox vs VMware · OpenStack vs VMware
Need high-performance storage for your cloud?
Talk to our storage engineers. We'll assess your workload requirements, benchmark performance needs, and recommend the right storage architecture — BlackStor, Ceph, or hybrid.
Discuss Storage Requirements