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Appendix A. Glossary of terms


A.1. Virtualization terms

Administration Portal
A web user interface provided by Red Hat Virtualization Manager, based on the oVirt engine web user interface. It allows administrators to manage and monitor cluster resources like networks, storage domains, and virtual machine templates.
Hosted Engine
The instance of Red Hat Virtualization Manager that manages RHHI for Virtualization.
Hosted Engine virtual machine
The virtual machine that acts as Red Hat Virtualization Manager. The Hosted Engine virtual machine runs on a virtualization host that is managed by the instance of Red Hat Virtualization Manager that is running on the Hosted Engine virtual machine.
Manager node
A virtualization host that runs Red Hat Virtualization Manager directly, rather than running it in a Hosted Engine virtual machine.
Red Hat Enterprise Linux host
A physical machine installed with Red Hat Enterprise Linux plus additional packages to provide the same capabilities as a Red Hat Virtualization host. This type of host is not supported for use with RHHI for Virtualization.
Red Hat Virtualization
An operating system and management interface for virtualizing resources, processes, and applications for Linux and Microsoft Windows workloads.
Red Hat Virtualization host
A physical machine installed with Red Hat Virtualization that provides the physical resources to support the virtualization of resources, processes, and applications for Linux and Microsoft Windows workloads. This is the only type of host supported with RHHI for Virtualization.
Red Hat Virtualization Manager
A server that runs the management and monitoring capabilities of Red Hat Virtualization.
Self-Hosted Engine node
A virtualization host that contains the Hosted Engine virtual machine. All hosts in a RHHI for Virtualization deployment are capable of becoming Self-Hosted Engine nodes, but there is only one Self-Hosted Engine node at a time.
storage domain
A named collection of images, templates, snapshots, and metadata. A storage domain can be comprised of block devices or file systems. Storage domains are attached to data centers in order to provide access to the collection of images, templates, and so on to hosts in the data center.
virtualization host
A physical machine with the ability to virtualize physical resources, processes, and applications for client access.
VM Portal
A web user interface provided by Red Hat Virtualization Manager. It allows users to manage and monitor virtual machines.

A.2. Storage terms

brick
An exported directory on a server in a trusted storage pool.
cache logical volume
A small, fast logical volume used to improve the performance of a large, slow logical volume.
geo-replication
One way asynchronous replication of data from a source Gluster volume to a target volume. Geo-replication works across local and wide area networks as well as the Internet. The target volume can be a Gluster volume in a different trusted storage pool, or another type of storage.
gluster volume
A logical group of bricks that can be configured to distribute, replicate, or disperse data according to workload requirements.
logical volume management (LVM)
A method of combining physical disks into larger virtual partitions. Physical volumes are placed in volume groups to form a pool of storage that can be divided into logical volumes as needed.
Red Hat Gluster Storage
An operating system based on Red Hat Enterprise Linux with additional packages that provide support for distributed, software-defined storage.
source volume
The Gluster volume that data is being copied from during geo-replication.
storage host
A physical machine that provides storage for client access.
target volume
The Gluster volume or other storage volume that data is being copied to during geo-replication.
thin provisioning
Provisioning storage such that only the space that is required is allocated at creation time, with further space being allocated dynamically according to need over time.
thick provisioning
Provisioning storage such that all space is allocated at creation time, regardless of whether that space is required immediately.
trusted storage pool
A group of Red Hat Gluster Storage servers that recognise each other as trusted peers.

A.3. Hyperconverged Infrastructure terms

Red Hat Hyperconverged Infrastructure (RHHI) for Virtualization
RHHI for Virtualization is a single product that provides both virtual compute and virtual storage resources. Red Hat Virtualization and Red Hat Gluster Storage are installed in a converged configuration, where the services of both products are available on each physical machine in a cluster.
hyperconverged host
A physical machine that provides physical storage, which is virtualized and consumed by virtualized processes and applications run on the same host. All hosts installed with RHHI for Virtualization are hyperconverged hosts.
Web Console
The web user interface for deploying, managing, and monitoring RHHI for Virtualization. The Web Console is provided by the the Web Console service and plugins for Red Hat Virtualization Manager.
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