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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
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