Logical volume management is a very handy tool to take care of your growing need for disk space as more and more data fills your disk. Traditionally hard disk partitions were created during operating system install to statically allocate space to take care of present and future need of disk space.
Logical volume management (LVM) on Linux provides an easy way to create a point in time snapshot of the logical volume (LV) hosting a filesystem. These snapshots freeze the data at that point of time when the snapshot was created even though actual data may keep getting modified on the real logical volume. This allows you to access the data exactly how it was at the point of time when the snapshot was created making way to create point in time backups of the data.
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