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Chapter 1. Overview

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The Red Hat Ceph Storage cluster is the foundation for all Ceph deployments. Based upon RADOS (Reliable Autonomic Distributed Object Store), Ceph Storage Clusters consist of two types of daemons:

  • A Ceph OSD (OSD) stores data as objects within placement groups assigned to the OSD
  • A Ceph monitor maintains a master copy of the cluster map.

A Red Hat Ceph Storage cluster may contain thousands of storage nodes. A minimal system will have at least one Ceph monitor and three Ceph OSDs for peering and object durability. A production system will have three or more monitors for high availability and typically a minimum of 50 OSDs for acceptable load balancing, re-balancing and recovery. See the installation guide to get a minimum Ceph cluster up and running.

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