lvm

LVMD – Logical Volume Manager Device

The lvm command is used to manage logical volumes on a Linux system. A logical volume is a collection of physical disks or partitions that are combined into a single, larger storage unit. This allows for flexible and efficient management of disk space.

Use cases:

• Creating new logical volumes from existing disks or partitions
• Extending or shrinking existing logical volumes to match changing storage needs
• Mirroring data across multiple physical disks for redundancy and fault tolerance

Syntax:


lvm <command> <options>


Some common lvm commands include:

• lvcreate: Creates a new logical volume.
• lvextend: Extends an existing logical volume to a specified size.
• lvreduce: Reduces the size of an existing logical volume.
• lvremove: Removes a logical volume and its associated physical volumes.

Special hacks:

• Snapshots: Use the --snapshot option with lvcreate to create a snapshot of an existing logical volume. This can be useful for backing up data or testing configurations without affecting the original volume.
• Mirroring: Use the --mirrors option with lvcreate to create a mirrored logical volume, which can provide redundancy and fault tolerance.

Experience level:

The lvm command is most relevant to users at the Intermediate experience level. Beginners may find it challenging due to its complexity, while professionals will likely be familiar with it.

To use this command effectively, you should have a good understanding of Linux storage management concepts, such as disk partitions and file systems. You should also be comfortable using the command-line interface and familiar with basic system administration tasks.