Introduction

Ceph provides a scalable, reliable storage service for storage clusters based on Reliable, Autonomic Distributed Object Store (RADOS).

A Ceph storage cluster contains two types of daemons:

• Ceph monitor

  The Ceph monitor maintains the primary copy of the cluster map. The monitor cluster ensures high availability when a monitor fails. The storage cluster client requests the latest copy of the cluster map from the Ceph monitor.

• Ceph object storage daemon (OSD)

  The Ceph OSD checks its own status and the status of other OSDs and reports the status to the monitor.