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Merge pull request #42492 from zdover23/wip-doc-rados-top-level-section-2021-07-26

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doc/rados: rewrite index.rst

Reviewed-by: Josh Durgin <jdurgin@redhat.com>
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doc/rados/index.rst
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The :term:`Ceph Storage Cluster` is the foundation for all Ceph deployments.
Based upon :abbr:`RADOS (Reliable Autonomic Distributed Object Store)`, Ceph
Storage Clusters consist of two types of daemons: a :term:`Ceph OSD Daemon`
(OSD) stores data as objects on a storage node; and a :term:`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.
Storage Clusters consist of several types of daemons:
1. a :term:`Ceph OSD Daemon` (OSD) stores data as objects on a storage node
2. a :term:`Ceph Monitor` (MON) maintains a master copy of the cluster map.
3. a :term:`Ceph Manager` manager daemon
A Ceph Storage Cluster might contain thousands of storage nodes. A
minimal system has 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.