+++ /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