Gluster

GlusterFS is a software-only, highly available, scalable, centrally managed storage pool for public and private cloud environments.

You can implement Gluster in two ways:

Through turnkey images for virtual machines - both self-hosted or available on a number of cloud providers, or bare metal Red Hat Hardware Compatibility List (HCL) certified host server and storage platforms. see Red Hat Storage portal

Or by installing the open-source GPLv3 GlusterFS on your favorite flavor of linux.

GlusterFS is a powerful network/cluster filesystem written in user space which uses FUSE to hook itself with VFS layer. GlusterFS takes a layered approach to the file system, where features are added/removed as per the requirement. Though GlusterFS is a File System, it uses already tried and tested disk file systems like ext3, ext4, xfs, etc. to store the data. It can easily scale up to petabytes of storage which is available to user under a single mount point.

Terms

brick
    The brick is the storage filesystem that has been assigned to a volume.
client
    The machine which mounts the volume (this may also be a server).
server
    The machine (virtual or bare metal) which hosts the actual filesystem in which data will be stored.
subvolume
    a brick after being processed by at least one translator.
volume
    The final share after it passes through all the translators.

Translator

A translator connects to one or more subvolumes, does something with them, and offers a subvolume connection.

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