The management by logical volumes (LVM) is a virtualization technique that allows for flexible storage management in Linux-based operating systems. It provides users with the ability to create, resize, and move logical volumes, which are virtual storage devices that can span multiple physical disks.

LVM operates by first dividing physical storage devices, such as hard drives or solid-state drives, into physical volumes (PVs). These PVs can be individual storage devices or partitions on a single device. Once the PVs are created, they can be combined into volume groups (VGs). VGs serve as containers that hold one or more PVs. They provide a unified storage space that can be easily managed.

Within a VG, logical volumes (LVs) are created. LVs represent the storage space that can be formatted with a file system and used to store data. They can be created in different sizes and their capacity can be dynamically adjusted as needed. This flexibility allows for efficient storage utilization and eliminates the need for predetermining the required disk space for storage.

One of the key advantages of LVM is the ability to resize logical volumes on-the-fly. This means that if the storage needs of a system increase or decrease, the logical volumes can be easily expanded or reduced in size without causing any downtime or disrupting the system. This dynamic resizing capability greatly simplifies storage administration and provides administrators with the ability to adapt to changing storage requirements.

Another benefit of LVM is the ability to migrate logical volumes across physical storage devices. This is particularly useful when upgrading or replacing hardware components. LVM allows for the migration of data from one physical device to another without disrupting the normal operation of the system. This capability ensures data availability and smooth transitions between storage devices.

LVM also provides a snapshot functionality, which allows for the creation of point-in-time copies of logical volumes. Snapshots are read-only representations of the original LVs and can be used for various purposes such as data backup, system testing, or creating consistent copies of data while it is being modified. Snapshots provide a convenient way to protect data and reduce the risk of accidental data loss.

The management by logical volumes is a powerful tool for storage administrators as it simplifies storage management, increases flexibility, and improves data protection capabilities. Its ability to dynamically resize logical volumes, migrate data across devices, and create snapshots makes it an ideal solution for managing storage in complex environments.

To utilize LVM effectively, administrators need to understand its concepts and command-line tools. There are also several graphical user interfaces available that provide a more user-friendly way to manage logical volumes, making it accessible to a wider range of users.

In conclusion, the management by logical volumes is a valuable feature in Linux-based operating systems. It offers flexibility, scalability, and efficient storage utilization. With its ability to resize logical volumes on-the-fly, migrate data across devices, and create snapshots, LVM simplifies storage management and provides administrators with the tools they need to effectively manage storage in their systems.

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