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-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