Ceph Storage Cluster

The Ceph Storage Cluster is the foundation for all Ceph deployments. Based upon RADOS, Ceph Storage Clusters consist of two types of daemons: a Ceph OSD Daemon (OSD) stores data as objects on a storage node; and a Ceph Monitor (MON) maintains a master copy of the cluster map. A Ceph Storage Cluster may contain thousands of storage nodes. A minimal system will have at least one Ceph Monitor and two Ceph OSD Daemons for data replication.

The Ceph File System, Ceph Object Storage and Ceph Block Devices read data from and write data to the Ceph Storage Cluster.

Config and Deploy

Ceph Storage Clusters have a few required settings, but most configuration settings have default values. A typical deployment uses a deployment tool to define a cluster and bootstrap a monitor. See Deployment for details on cephadm.


Once you have deployed a Ceph Storage Cluster, you may begin operating your cluster.


Most Ceph deployments use Ceph Block Devices, Ceph Object Storage and/or the Ceph File System. You may also develop applications that talk directly to the Ceph Storage Cluster.