Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.. _rados-index:
+
+======================
+ Ceph Storage Cluster
+======================
+
+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 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.
+
+.. container:: columns-3
+
+   .. container:: column
+
+      .. raw:: html
+
+          <h3>Config and Deploy</h3>
+
+      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 :ref:`cephadm` for details.
+
+      .. toctree::
+         :maxdepth: 2
+
+         Configuration <configuration/index>
+
+   .. container:: column
+
+      .. raw:: html
+
+          <h3>Operations</h3>
+
+      Once you have deployed a Ceph Storage Cluster, you may begin operating
+      your cluster.
+
+      .. toctree::
+         :maxdepth: 2
+
+         Operations <operations/index>
+
+      .. toctree::
+         :maxdepth: 1
+
+         Man Pages <man/index>
+
+      .. toctree::
+         :hidden:
+
+         troubleshooting/index
+
+   .. container:: column
+
+      .. raw:: html
+
+          <h3>APIs</h3>
+
+      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.
+
+      .. toctree::
+         :maxdepth: 2
+
+         APIs <api/index>
+
+.. _Ceph Block Devices: ../rbd/
+.. _Ceph File System: ../cephfs/
+.. _Ceph Object Storage: ../radosgw/
+.. _Deployment: ../cephadm/