Why ceph

Ceph provides massive storage capacity, and it supports numerous use cases, such as:

• The Ceph Block Device client is a leading storage backend for cloud platforms that provides limitless storage for volumes and images with high performance features like copy-on-write cloning.

• The Ceph Object Gateway client is a leading storage backend for cloud platforms that provides a RESTful S3-compliant and Swift-compliant object storage for objects like audio, bitmap, video, and other data.

• The Ceph File System for traditional file storage.

A CRUSH map describes a topography of cluster resources, and the map exists both on client hosts and Ceph Monitor hosts within the cluster. Ceph clients and Ceph OSDs both use the CRUSH map and the CRUSH algorithm. Ceph clients communicate directly with OSDs, eliminating a centralized object lookup and a potential performance bottleneck. With awareness of the CRUSH map and communication with their peers, OSDs can handle replication, backfilling, and recovery, allowing for dynamic failure recovery.