At a Glance:
Ceph is an open-source scalable distributed storage system providing object, block, and file-level storage interfaces on a single unified platform designed to run on commodity hardware.
Overview:
Ceph is a distributed storage system that provides a unified platform for object, block, and file storage. It is designed to scale to the exabyte-level and run on commodity hardware without a single point of failure. The system self-manages data replication and rebalancing across available hardware. Ceph offers native interfaces for multiple storage types, including an S3-compatible object store, a block device interface, and a POSIX-compliant file system, all managed through a common cluster. It is suited for organizations and developers needing a scalable, software-defined storage infrastructure that can be deployed on standard servers.
Key Decision Points:
Storage interface flexibility: Provides object, block, and file storage interfaces from a single cluster, avoiding the need for separate storage systems.
Commodity hardware deployment: Designed to run on standard servers without specialized hardware, reducing infrastructure requirements.
Self-managing architecture: The cluster automatically replicates, rebalances, and recovers data when hardware is added, removed, or fails.
Proprietary storage alternative: Serves as an open-source alternative to proprietary software-defined storage and unified storage appliances.
Scalability focus: Architected to scale to thousands of nodes and exabyte-level capacity.
Core Features:
RADOS object store: Foundation layer providing reliable autonomous distributed object storage with self-healing and self-managing capabilities.
RADOS Block Device (RBD): Provides block-level storage interfaces that can be used with virtual machines and physical hosts.
CephFS: A POSIX-compliant distributed file system that runs on top of the RADOS layer.
RADOS Gateway (RGW): Provides S3-compatible and Swift-compatible object storage APIs built on top of RADOS.
CRUSH algorithm: Controlled Replication Under Scalable Hashing enables automatic data distribution calculation without a central lookup table.
Unified platform: All storage types (object, block, file) are managed through the same cluster and storage backend.
Use Cases:
Cloud infrastructure storage: Serves as the backend block and object storage layer for OpenStack and other cloud platforms using RBD and RGW.
S3-compatible object storage: Provides on-premises object storage that supports existing S3-compatible applications and tools.
Virtual machine disk storage: Supplies block device images for virtual machines in KVM, Proxmox, and similar virtualization environments.
Scalable file storage: Delivers a distributed POSIX-compliant file system for applications and users requiring shared file access.
Open-Source Alternative Value:
Ceph provides a unified, self-managed alternative to proprietary distributed storage systems and cloud-based storage services. Users can deploy object, block, and file storage on their own commodity hardware, fully controlling the infrastructure and data placement. As an open-source project under the LGPL, Ceph allows organizations to build and operate large-scale storage without per-license costs or dependency on a single vendor's hardware stack. Its integration with S3-compatible APIs through the RADOS Gateway also offers an on-premises alternative to public cloud object storage that supports existing tooling.
