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-===================
- Ceph Block Device
-===================
-
-.. index:: Ceph Block Device; introduction
-
-A block is a sequence of bytes (for example, a 512-byte block of data).
-Block-based storage interfaces are the most common way to store data with
-rotating media such as hard disks, CDs, floppy disks, and even traditional
-9-track tape. The ubiquity of block device interfaces makes a virtual block
-device an ideal candidate to interact with a mass data storage system like Ceph.
-
-Ceph block devices are thin-provisioned, resizable and store data striped over
-multiple OSDs in a Ceph cluster.  Ceph block devices leverage
-:abbr:`RADOS (Reliable Autonomic Distributed Object Store)` capabilities
-such as snapshotting, replication and consistency. Ceph's
-:abbr:`RADOS (Reliable Autonomic Distributed Object Store)` Block Devices (RBD)
-interact with OSDs using kernel modules or the ``librbd`` library.
-
-.. ditaa::  +------------------------+ +------------------------+
-            |     Kernel Module      | |        librbd          |
-            +------------------------+-+------------------------+
-            |                   RADOS Protocol                  |
-            +------------------------+-+------------------------+
-            |          OSDs          | |        Monitors        |
-            +------------------------+ +------------------------+
-
-.. note:: Kernel modules can use Linux page caching. For ``librbd``-based
-   applications, Ceph supports `RBD Caching`_.
-
-Ceph's block devices deliver high performance with infinite scalability to
-`kernel modules`_, or to :abbr:`KVMs (kernel virtual machines)` such as `QEMU`_, and
-cloud-based computing systems like `OpenStack`_ and `CloudStack`_ that rely on
-libvirt and QEMU to integrate with Ceph block devices. You can use the same cluster
-to operate the `Ceph RADOS Gateway`_, the `Ceph FS filesystem`_, and Ceph block
-devices simultaneously.
-
-.. important:: To use Ceph Block Devices, you must have access to a running
-   Ceph cluster.
-
-.. toctree::
-	:maxdepth: 1
-
-	Commands <rados-rbd-cmds>
-	Kernel Modules <rbd-ko>
-	Snapshots<rbd-snapshot>
-	Mirroring <rbd-mirroring>
-	iSCSI Gateway <iscsi-overview>
-	QEMU <qemu-rbd>
-	libvirt <libvirt>
-	Cache Settings <rbd-config-ref/>
-	OpenStack <rbd-openstack>
-	CloudStack <rbd-cloudstack>
-	RBD Replay <rbd-replay>
-
-.. toctree::
-	:maxdepth: 2
-
-	Manpages <man/index>
-
-.. toctree::
-	:maxdepth: 2
-
-	APIs <api/index>
-
-.. _RBD Caching: ../rbd-config-ref/
-.. _kernel modules: ../rbd-ko/
-.. _QEMU: ../qemu-rbd/
-.. _OpenStack: ../rbd-openstack
-.. _CloudStack: ../rbd-cloudstack
-.. _Ceph RADOS Gateway: ../../radosgw/
-.. _Ceph FS filesystem: ../../cephfs/