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116 lines
3.8 KiB
Markdown
116 lines
3.8 KiB
Markdown
### Access Control Lists
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Access Control Lists (ACLs) allows you to assign different permissions
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for different users or groups even though they do not correspond to the
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original owner or the owning group.
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### Brick
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Brick is the basic unit of storage, represented by an export directory
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on a server in the trusted storage pool.
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### Cluster
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A cluster is a group of linked computers, working together closely thus
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in many respects forming a single computer.
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### Distributed File System
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A file system that allows multiple clients to concurrently access data
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over a computer network
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### FUSE
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Filesystem in Userspace (FUSE) is a loadable kernel module for Unix-like
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computer operating systems that lets non-privileged users create their
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own file systems without editing kernel code. This is achieved by
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running file system code in user space while the FUSE module provides
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only a "bridge" to the actual kernel interfaces.
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### glusterd
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Gluster management daemon that needs to run on all servers in the
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trusted storage pool.
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### Geo-Replication
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Geo-replication provides a continuous, asynchronous, and incremental
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replication service from site to another over Local Area Networks
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(LANs), Wide Area Network (WANs), and across the Internet.
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### Metadata
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Metadata is defined as data providing information about one or more
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other pieces of data. There is no special metadata storage concept in
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GlusterFS. The metadata is stored with the file data itself.
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### Namespace
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Namespace is an abstract container or environment created to hold a
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logical grouping of unique identifiers or symbols. Each Gluster volume
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exposes a single namespace as a POSIX mount point that contains every
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file in the cluster.
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### POSIX
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Portable Operating System Interface [for Unix] is the name of a family
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of related standards specified by the IEEE to define the application
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programming interface (API), along with shell and utilities interfaces
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for software compatible with variants of the Unix operating system.
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Gluster exports a fully POSIX compliant file system.
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### RAID
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Redundant Array of Inexpensive Disks (RAID) is a technology that provides
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increased storage reliability through redundancy, combining multiple
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low-cost, less-reliable disk drives components into a logical unit where
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all drives in the array are interdependent.
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### RRDNS
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Round Robin Domain Name Service (RRDNS) is a method to distribute load
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across application servers. It is implemented by creating multiple A
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records with the same name and different IP addresses in the zone file
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of a DNS server.
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### Trusted Storage Pool
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A storage pool is a trusted network of storage servers. When you start
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the first server, the storage pool consists of that server alone.
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### Userspace
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Applications running in user space don’t directly interact with
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hardware, instead using the kernel to moderate access. Userspace
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applications are generally more portable than applications in kernel
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space. Gluster is a user space application.
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### Volume
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A volume is a logical collection of bricks. Most of the gluster
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management operations happen on the volume.
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### Vol file
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`.vol` files are configuration files used by glusterfs process. Volfiles
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will be usually located at `/var/lib/glusterd/vols/volume-name/`.
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Eg: `vol-name-fuse.vol`, `export-brick-name.vol` etc. Sub-volumes in the `.vol`
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files are present in the bottom-up approach and then after tracing forms
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a tree structure, where in the hierarchy last comes the client volumes.
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### Client
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The machine which mounts the volume (this may also be a server).
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### Server
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The machine which hosts the actual file system in which the data will be
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stored.
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### Replicate
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Replicate is generally done to make a redundancy of the storage for data
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availability.
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Once familiar with terminologies, Understand the [Architecture of GlusterFS](./Architecture.md)
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