Adding upstream version 18.2.2.upstream/18.2.2

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

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+=================
+ Welcome to Ceph
+=================
+
+Ceph delivers **object, block, and file storage in one unified system**.
+
+.. warning::
+
+   :ref:`If this is your first time using Ceph, read the "Basic Workflow"
+   page in the Ceph Developer Guide to learn how to contribute to the
+   Ceph project. (Click anywhere in this paragraph to read the "Basic
+   Workflow" page of the Ceph Developer Guide.) <basic workflow dev guide>`.
+
+.. note::
+
+   :ref:`If you want to make a commit to the documentation but you don't
+   know how to get started, read the "Documenting Ceph" page. (Click anywhere
+   in this paragraph to read the "Documenting Ceph" page.) <documenting_ceph>`.
+
+.. container:: columns-3
+
+   .. container:: column
+
+      .. raw:: html
+
+          <h3>Ceph Object Store</h3>
+
+      - RESTful Interface
+      - S3- and Swift-compliant APIs
+      - S3-style subdomains
+      - Unified S3/Swift namespace
+      - User management
+      - Usage tracking
+      - Striped objects
+      - Cloud solution integration
+      - Multi-site deployment
+      - Multi-site replication
+
+   .. container:: column
+
+      .. raw:: html
+
+          <h3>Ceph Block Device</h3>
+
+      - Thin-provisioned
+      - Images up to 16 exabytes
+      - Configurable striping
+      - In-memory caching
+      - Snapshots
+      - Copy-on-write cloning
+      - Kernel driver support
+      - KVM/libvirt support
+      - Back-end for cloud solutions
+      - Incremental backup
+      - Disaster recovery (multisite asynchronous replication)
+
+   .. container:: column
+
+      .. raw:: html
+
+          <h3>Ceph File System</h3>
+
+      - POSIX-compliant semantics
+      - Separates metadata from data
+      - Dynamic rebalancing
+      - Subdirectory snapshots
+      - Configurable striping
+      - Kernel driver support
+      - FUSE support
+      - NFS/CIFS deployable
+      - Use with Hadoop (replace HDFS)
+
+.. container:: columns-3
+
+   .. container:: column
+
+      See `Ceph Object Store`_ for additional details.
+
+   .. container:: column
+
+      See `Ceph Block Device`_ for additional details.
+
+   .. container:: column
+
+      See `Ceph File System`_ for additional details.
+
+Ceph is highly reliable, easy to manage, and free. The power of Ceph
+can transform your company's IT infrastructure and your ability to manage vast
+amounts of data. To try Ceph, see our `Getting Started`_ guides. To learn more
+about Ceph, see our `Architecture`_ section.
+
+
+
+.. _Ceph Object Store: radosgw
+.. _Ceph Block Device: rbd
+.. _Ceph File System: cephfs
+.. _Getting Started: install
+.. _Architecture: architecture
+
+.. toctree::
+   :maxdepth: 3
+   :hidden:
+
+   start/intro
+   install/index
+   cephadm/index
+   rados/index
+   cephfs/index
+   rbd/index
+   radosgw/index
+   mgr/index
+   mgr/dashboard
+   monitoring/index
+   api/index
+   architecture
+   Developer Guide <dev/developer_guide/index>
+   dev/internals
+   governance
+   foundation
+   ceph-volume/index
+   releases/general
+   releases/index
+   security/index
+   Glossary <glossary>
+   Tracing <jaegertracing/index>