--- /dev/null
+===============
+ 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.
+
+ cephx
+ The Ceph authentication protocol. Cephx operates like Kerberos, but it
+ has no single point of failure.
+
+ 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
+ Reliable Autonomic Distributed Object Store
+ The core set of storage software which stores the user's data (MON+OSD).
+
+ Ceph Cluster Map
+ cluster map
+ The set of maps comprising the monitor map, OSD map, PG map, MDS map and
+ CRUSH map. See `Cluster Map`_ for details.
+
+ 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).
+ Sometimes, Ceph users use the
+ term "OSD" to refer to :term:`Ceph OSD Daemon`, though the
+ proper term is "Ceph OSD".
+
+ Ceph OSD Daemon
+ Ceph OSD Daemons
+ Ceph OSD
+ The Ceph OSD software, which interacts with a logical
+ disk (:term:`OSD`). Sometimes, Ceph users use the
+ term "OSD" to refer to "Ceph OSD Daemon", though the
+ proper term is "Ceph OSD".
+
+ OSD id
+ The integer that defines an OSD. It is generated by the monitors as part
+ of the creation of a new OSD.
+
+ OSD fsid
+ This is a unique identifier used to further improve the uniqueness of an
+ OSD and it is found in the OSD path in a file called ``osd_fsid``. This
+ ``fsid`` term is used interchangeably with ``uuid``
+
+ OSD uuid
+ Just like the OSD fsid, this is the OSD unique identifer and is used
+ interchangeably with ``fsid``
+
+ bluestore
+ OSD BlueStore is a new back end for OSD daemons (kraken and newer
+ versions). Unlike :term:`filestore` it stores objects directly on the
+ Ceph block devices without any file system interface.
+
+ filestore
+ A back end for OSD daemons, where a Journal is needed and files are
+ written to the filesystem.
+
+ Ceph Monitor
+ MON
+ The Ceph monitor software.
+
+ Ceph Manager
+ MGR
+ The Ceph manager software, which collects all the state from the whole
+ cluster in one place.
+
+ Ceph Metadata Server
+ MDS
+ The Ceph metadata software.
+
+ Ceph Clients
+ Ceph Client
+ The collection of Ceph components which can access a Ceph Storage
+ Cluster. These include the Ceph Object Gateway, the Ceph Block 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.
+
+ CRUSH
+ Controlled Replication Under Scalable Hashing. It is the algorithm
+ Ceph uses to compute object storage locations.
+
+ ruleset
+ A set of CRUSH data placement rules that applies to a particular pool(s).
+
+ Pool
+ Pools
+ Pools are logical partitions for storing objects.
+
+ systemd oneshot
+ A systemd ``type`` where a command is defined in ``ExecStart`` which will
+ exit upon completion (it is not intended to daemonize)
+
+ LVM tags
+ Extensible metadata for LVM volumes and groups. It is used to store
+ Ceph-specific information about devices and its relationship with
+ OSDs.
+
+.. _http://github.com/ceph: http://github.com/ceph
+.. _Cluster Map: ../architecture#cluster-map
Code Review / stor4nfv.git / blobdiff