doc: Added glossary.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>

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+===============
+ Ceph Glossary
+===============
+
+Ceph is growing rapidly. As firms deploy Ceph, the technical terms such as
+"RADOS", "RBD," "RGW" and so forth require corresponding marketing terms
+that explain what each component does. The terms in this glossary are 
+intended to complement the existing technical terminology.
+
+Sometimes more than one term applies to a definition. Generally, the first
+term reflects a term consistent with Ceph's marketing, and secondary terms
+reflect either technical terms or legacy ways of referring to Ceph systems.
+
+
+.. glossary:: 
+
+       Ceph Project
+               The aggregate term for the people, software, mission and infrastructure 
+               of Ceph.
+               
+       Ceph
+       Ceph Platform
+               All Ceph software, which includes any piece of code hosted at 
+               `http://github.com/ceph`_.
+               
+       Ceph System
+       Ceph Stack
+               A collection of two or more components of Ceph.
+
+       Ceph Node
+       Node
+       Host
+               Any single machine or server in a Ceph System.
+               
+       Ceph Storage Cluster
+       Ceph Object Store
+       RADOS
+       RADOS Cluster
+               The core set of storage software which stores the user's data (MON+OSD).
+
+       Ceph Object Storage
+               The object storage "product", service or capabilities, which consists
+               essentially of a Ceph Storage Cluster and a Ceph Object Gateway.
+
+       Ceph Object Gateway
+       RADOS Gateway
+       RGW
+               The S3/Swift gateway component of Ceph.
+                               
+       Ceph Block Device
+       RBD
+               The block storage component of Ceph.
+               
+       Ceph Block Storage
+               The block storage "product," service or capabilities when used in 
+               conjunction with ``librbd``, a hypervisor such as QEMU or Xen, and a
+               hypervisor abstraction layer such as ``libvirt``.
+
+       Ceph Filesystem
+       CephFS
+       Ceph FS
+               The POSIX filesystem components of Ceph.
+
+       Cloud Platforms
+       Cloud Stacks
+               Third party cloud provisioning platforms such as OpenStack, CloudStack, 
+               OpenNebula, ProxMox, etc.
+
+       Object Storage Device (OSD)
+               A physical or logical storage unit (*e.g.*, LUN). Ceph users often 
+               conflate the term OSD with "Ceph OSD Daemon."
+               
+       Ceph OSD Daemon
+       OSD
+       Ceph OSD
+               The Ceph OSD software, which interacts with a logical disk (OSD). Ceph 
+               users often frequently conflate the term OSD with "Ceph OSD Daemon."
+               
+       Ceph Monitor
+       MON
+               The Ceph monitor software.
+       
+       Ceph Metadata Server
+       MDS
+               The Ceph metadata software.
+
+       Ceph Clients
+               The collection of Ceph components which can access a Ceph Storage 
+               Cluster. These include the Ceph Object Gateway, the Ceph Black Device, 
+               the Ceph Filesystem,    and their corresponding libraries, kernel modules, 
+               and FUSEs.
+
+       Ceph Kernel Modules
+               The collection of kernel modules which can be used to interact with the 
+               Ceph System (e.g,. ``ceph.ko``, ``rbd.ko``).
+
+       Ceph Client Libraries
+               The collection of libraries that can be used to interact with components 
+               of the Ceph System.
+
+       Ceph Release
+               Any distinct numbered version of Ceph.
+       
+       Ceph Point Release
+               Any ad-hoc release that includes only bug or security fixes.
+
+       Ceph Interim Release
+               Versions of Ceph that have not yet been put through quality assurance
+               testing, but may contain new features.
+
+       Ceph Release Candidate
+               A major version of Ceph that has undergone initial quality assurance 
+               testing and is ready for beta testers.
+
+       Ceph Stable Release
+               A major version of Ceph where all features from the preceding interim 
+               releases have been put through quality assurance testing successfully.
+
+       Ceph Test Framework
+       Teuthology
+               The collection of software that performs scripted tests on Ceph.
+
+
+
+.. _http://github.com/ceph: http://github.com/ceph
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