Gluster Terminology

Brick
    A basic unit of storage in the Gluster file system. A brick is disk storage
    made available using an exported directory on a server in a trusted storage
    pool.

Distributed File System
    A file system that allows multiple clients to concurrently access data
    spread across bricks in a trusted storage pool.

Extended Attributes
    Extended file attributes (abbreviated as xattr) is a file system feature
    that enables users or programs to associate files and directories with
    metadata. Gluster stores metadata in xattrs.

Gluster Client
    A Gluster client runs the glusterfs-client software to mount gluster
    storage, either locally or remotely using the Filesystem in Userspace (FUSE)
    software interface.

Gluster Server
    A Gluster server runs the glusterd service daemon to become a node in the
    trusted storage pool.

Gluster Volume
    A Gluster volume is a logical collection of bricks. Volumes can be
    distributed, replicated, distributed replicated, dispersed, or distributed
    dispersed.

Heketi
    A service that exposes an API for scripts to manage trusted storage pools
    and volumes automatically.

Node
    A host system that is a member of a trusted storage pool.

Split-brain
    A situation where data on two or more bricks in a replicated volume
    diverges (the content or metadata differs).

Trusted Storage Pool
    A trusted storage pool is a collection of nodes that form a cluster.