Ceph is an open source, unified, distributed storage, massively scalable system designed for excellent performance, reliability and scalability.
Ceph’s main goals are to be completely distributed without a single point of failure, scalable to the exabyte level, and freely-available. The data is seamlessly replicated, making it fault tolerant.
It is comprised of an object store, block store, and a distributed file system. Ceph runs on commodity hardware, it is self-healing and self-managing, and has no single point of failure.
Ceph’s file system runs on top of the same object storage system that provides object storage and block device interfaces.
- RADOSGW – a bucket-based REST gateway, that is compatible with applications written for S3 and Swif.
- RADOS Block Device (RBD) – provides access to block device images that are striped and replicated across the entire storage cluster.
- Ceph FS – provides a POSIX-compliant network distributed file system, with a Linux kernel client and support for FUSE. Ceph FS uses the same RADOS object storage device system as RADOS block devices and RADOS object stores such as the RADOS gateway with its S3 and Swift APIs, or native bindings.
- RADOS – an autonomic, distributed object store. RADOS, is the object storage component for CephFS filesystems, Ceph RADOS Gateways, and Ceph Block Devices. Ceph’s RADOS Object Stores consist of two types of daemons: Object Storage Daemons (OSDs) store data as objects on storage nodes; and Monitors maintain a master copy of the cluster map.
- Librados – a library allowing applications to directly access RADOS.
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