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diff --git a/doc/admin-guide/en-US/markdown/glossary.md b/doc/admin-guide/en-US/markdown/glossary.md deleted file mode 100644 index d047622a93b..00000000000 --- a/doc/admin-guide/en-US/markdown/glossary.md +++ /dev/null @@ -1,198 +0,0 @@ -Glossary -======== - -**Brick** -: A Brick is the basic unit of storage in GlusterFS, represented by an - export directory on a server in the trusted storage pool. A Brick is - represented by combining a server name with an export directory in the - following format: - - `SERVER:EXPORT` - - For example: - - `myhostname:/exports/myexportdir/` - -**Client** -: Any machine that mounts a GlusterFS volume. - -**Cluster** -: A cluster is a group of linked computers, working together closely - thus in many respects forming a single computer. - -**Distributed File System** -: A file system that allows multiple clients to concurrently access - data over a computer network. - -**Extended Attributes** -: Extended file attributes (abbreviated xattr) is a file system feature - that enables users/programs to associate files/dirs with metadata. - -**Filesystem** -: A method of storing and organizing computer files and their data. - Essentially, it organizes these files into a database for the - storage, organization, manipulation, and retrieval by the computer's - operating system. - - Source: [Wikipedia][] - -**FUSE** -: Filesystem in Userspace (FUSE) is a loadable kernel module for - Unix-like computer operating systems that lets non-privileged users - create their own file systems without editing kernel code. This is - achieved by running file system code in user space while the FUSE - module provides only a "bridge" to the actual kernel interfaces. - - Source: [Wikipedia][1] - -**Geo-Replication** -: Geo-replication provides a continuous, asynchronous, and incremental - replication service from site to another over Local Area Networks - (LAN), Wide Area Network (WAN), and across the Internet. - -**GFID** -: Each file/directory on a GlusterFS volume has a unique 128-bit number - associated with it called the GFID. This is analogous to inode in a - regular filesystem. - -**glusterd** -: The Gluster management daemon that needs to run on all servers in - the trusted storage pool. - -**Infiniband** - InfiniBand is a switched fabric computer network communications link - used in high-performance computing and enterprise data centers. - -**Metadata** -: Metadata is data providing information about one or more other - pieces of data. - -**Namespace** -: Namespace is an abstract container or environment created to hold a - logical grouping of unique identifiers or symbols. Each Gluster - volume exposes a single namespace as a POSIX mount point that - contains every file in the cluster. - -**Node** -: A server or computer that hosts one or more bricks. - -**Open Source** -: Open source describes practices in production and development that - promote access to the end product's source materials. Some consider - open source a philosophy, others consider it a pragmatic - methodology. - - Before the term open source became widely adopted, developers and - producers used a variety of phrases to describe the concept; open - source gained hold with the rise of the Internet, and the attendant - need for massive retooling of the computing source code. - - Opening the source code enabled a self-enhancing diversity of - production models, communication paths, and interactive communities. - Subsequently, a new, three-word phrase "open source software" was - born to describe the environment that the new copyright, licensing, - domain, and consumer issues created. - - Source: [Wikipedia][2] - -**Petabyte** -: A petabyte (derived from the SI prefix peta- ) is a unit of - information equal to one quadrillion (short scale) bytes, or 1000 - terabytes. The unit symbol for the petabyte is PB. The prefix peta- - (P) indicates a power of 1000: - - 1 PB = 1,000,000,000,000,000 B = 10005 B = 1015 B. - - The term "pebibyte" (PiB), using a binary prefix, is used for the - corresponding power of 1024. - - Source: [Wikipedia][3] - -**POSIX** -: Portable Operating System Interface (for Unix) is the name of a - family of related standards specified by the IEEE to define the - application programming interface (API), along with shell and - utilities interfaces for software compatible with variants of the - Unix operating system. Gluster exports a fully POSIX compliant file - system. - -**Quorum** -: The configuration of quorum in a trusted storage pool determines the - number of server failures that the trusted storage pool can sustain. - If an additional failure occurs, the trusted storage pool becomes - unavailable. - -**Quota** -: Quotas allow you to set limits on usage of disk space by directories or - by volumes. - -**RAID** -: Redundant Array of Inexpensive Disks (RAID) is a technology that - provides increased storage reliability through redundancy, combining - multiple low-cost, less-reliable disk drives components into a - logical unit where all drives in the array are interdependent. - -**RDMA** -: Remote direct memory access (RDMA) is a direct memory access from the - memory of one computer into that of another without involving either - one's operating system. This permits high-throughput, low-latency - networking, which is especially useful in massively parallel computer - clusters. - -**Rebalance** -: A process of fixing layout and resdistributing data in a volume when a - brick is added or removed. - -**RRDNS** -: Round Robin Domain Name Service (RRDNS) is a method to distribute - load across application servers. RRDNS is implemented by creating - multiple A records with the same name and different IP addresses in - the zone file of a DNS server. - -**Samba** -: Samba allows file and print sharing between computers running Windows and - computers running Linux. It is an implementation of several services and - protocols including SMB and CIFS. - -**Self-Heal** -: The self-heal daemon that runs in the background, identifies - inconsistencies in files/dirs in a replicated volume and then resolves - or heals them. This healing process is usually required when one or more - bricks of a volume goes down and then comes up later. - -**Split-brain** -: This is a situation where data on two or more bricks in a replicated - volume start to diverge in terms of content or metadata. In this state, - one cannot determine programitically which set of data is "right" and - which is "wrong". - -**Translator** -: Translators (also called xlators) are stackable modules where each - module has a very specific purpose. Translators are stacked in a - hierarchical structure called as graph. A translator receives data - from its parent translator, performs necessary operations and then - passes the data down to its child translator in hierarchy. - -**Trusted Storage Pool** -: A storage pool is a trusted network of storage servers. When you - start the first server, the storage pool consists of that server - alone. - -**Userspace** -: Applications running in user space don’t directly interact with - hardware, instead using the kernel to moderate access. Userspace - applications are generally more portable than applications in kernel - space. Gluster is a user space application. - -**Volfile** -: Volfile is a configuration file used by glusterfs process. Volfile - will be usually located at `/var/lib/glusterd/vols/VOLNAME`. - -**Volume** -: A volume is a logical collection of bricks. Most of the gluster - management operations happen on the volume. - - [Wikipedia]: http://en.wikipedia.org/wiki/Filesystem - [1]: http://en.wikipedia.org/wiki/Filesystem_in_Userspace - [2]: http://en.wikipedia.org/wiki/Open_source - [3]: http://en.wikipedia.org/wiki/Petabyte |