The Logical Volume Manager (LVM) is a method of managing disk storage on Unix-like operating systems. It allows for logical volumes to be created, which can span across multiple physical disks or partitions. These logical volumes can be resized or moved without requiring changes to the underlying physical storage.
The LVM approach to managing filesystems involves the following steps:
- Physical storage is divided into one or more physical volumes (PVs). These can be disks, disk partitions, or even whole disks.
- One or more PVs are combined into a volume group (VG). A VG is a pool of disk space that can be allocated to logical volumes.
- Logical volumes (LVs) are created within a VG. An LV is a virtual partition that can be formatted with a filesystem and mounted like any other partition.
- LVs can be resized or moved without affecting the underlying physical storage. This allows for easy management of disk space without having to repartition disks.
- Additional PVs can be added to a VG, and LVs can be created or moved between VGs. This provides a great deal of flexibility in managing storage on a system.
Overall, the LVM approach to managing filesystems provides a lot of flexibility and allows for easy management of disk space on Unix-like systems. It is widely used in enterprise environments where disk management is a critical task.