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diff --git a/doc/admin-guide/en-US/markdown/glossary.md b/doc/admin-guide/en-US/markdown/glossary.md new file mode 100644 index 000000000..0febaff8f --- /dev/null +++ b/doc/admin-guide/en-US/markdown/glossary.md @@ -0,0 +1,134 @@ +Glossary +======== + +Brick +: A Brick is the GlusterFS basic unit of storage, represented by an + export directory on a server in the trusted storage pool. A Brick is + expressed by combining a server with an export directory in the + following format: + + `SERVER:EXPORT` + + For example: + + `myhostname:/exports/myexportdir/` + +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. + +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. + +glusterd +: The Gluster management daemon that needs to run on all servers in + the trusted storage pool. + +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. + +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. + +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. + +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. + +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 |