Ceph and Proxmox: The Next Stage in Virtual Storage Evolution


In the virtualization arena, your choice of storage architecture is more than a technical decision—it’s a business-critical one. While RAID has historically been the go-to solution, its limitations are becoming evident as we move into an era of larger storage requirements. Ceph, particularly when utilized in tandem with Proxmox, offers a more advanced alternative. This discussion delves into why Ceph is gradually outpacing traditional RAID systems.

RAID Fundamentals: The Old Guard

RAID — Redundant Array of Independent Disks (also doubled as Redundant Arry of Inexpensive Disks) — has long been the default choice for storing data across multiple hard drives, improving both performance and data redundancy. Common RAID setups include:

  • RAID 0: Prioritizes speed over redundancy by striping data across multiple drives.
  • RAID 1: Mirrors two drives to preserve data integrity.
  • RAID 5 & 6: Strikes a balance between speed and redundancy through data striping and parity.

Yet, RAID’s inefficiencies are becoming apparent. With the deployment of larger 20TB drives, the time required for data reconstruction post-failure has become increasingly prohibitive, exposing systems to heightened risk of additional drive failures.

Ceph Unveiled: A RAID Reimagined

Ceph transcends RAID’s limitations in several ways:

  1. Redundancy: Ceph employs a more nuanced approach to redundancy, replicating data across numerous devices, which boosts resilience against simultaneous device failures — a capability RAID lacks.
  2. Swift Recovery: Ceph’s architecture enables more efficient data recovery operations, sidestepping the lengthy reconstruction processes typical in RAID setups.
  3. Scalability Ease: Ceph offers smooth scalability. It accommodates additional storage devices incrementally, without requiring the exhaustive reconfigurations often seen in RAID systems.
  4. Flexible Growth: Unlike RAID, which requires uniform drive size increments, Ceph allows for the integration of new storage devices of different types and sizes without causing disruptions.

Ceph and Proxmox: A Symbiotic Partnership

Integrating Ceph into a Proxmox environment amplifies the advantages of both:

  1. Seamless Storage: Move beyond local storage and convoluted NAS/SAN setups. Ceph provides a unified, scalable, and redundant storage solution, accessible across all Proxmox nodes.
  2. Advanced VM Handling: Traditional RAID-based VM storage is susceptible to downtime in the event of an array failure. In a Ceph-Proxmox system, VMs stay online even in the face of multiple device failures and allow for easy migrations, manual or automated, through Proxmox’s High Availability capabilities.


While RAID remains a viable option, it’s increasingly lagging behind the demands of modern storage, particularly in larger setups. Ceph, especially when integrated with Proxmox, provides a future-proof alternative that’s resilient, scalable, and highly efficient. Adopting this approach is a step toward a more agile, dependable, and future-ready virtual infrastructure.

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