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RHCSA 8 - CH15
Managing Advanced Storage
11
Computer Science
Undergraduate 3
01/01/2022

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Term
deduplication
Definition
A storage technology that analyzes data to be stored on disk and takes out duplicate patterns to allow for more efficient storage. Used in VDO.
Term
device mapper
Definition
A service that is used by the Linux kernel to communicate with storage devices.
Term
logical extent
Definition
The building block that is used in LVM to create logical volumes. It normally has a size of a few megabytes that corresponds to the size of the physical ones that are used.
Term
logical volume (LV)
Definition
In LVM, the entity on which a file system is created. They are often used on RHEL because they offer important advantages, such as the option to dynamically resize them and the file system that it hosts.
Term
physical extent
Definition
The physical building block that is used when creating LVM physical volumes.
Term
physical volume (PV)
Definition
The foundation building block of an LVM configuration. Typically corresponds to a partition or a complete disk device.
Term
snapshot
Definition
A “photo” of the actual state of a file system.
Term
Stratis
Definition
The new volume managing file system in RHEL 8.
Term
thin allocation
Definition
In storage, an approach that enables the system to present more storage to the storage user than what is really available by using smart technologies to store data, like deduplication.
Term
Virtual Data Optimizer (VDO)
Definition
A new advanced storage solution in RHEL 8 that compresses data by using deduplication and can therefore be used for thin allocation of storage volumes.
Term
volume group (VG)
Definition
The abstraction layer that in Logical Volume Manager is used to represent all available storage presented by physical volumes from which logical volumes can be created.
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