Книга: Fedora™ Unleashed, 2008 edition

Logical Volume Management

Logical Volume Management

The previous example showed you how to add a new drive to overcome a lack of disk space. What if this could be done without all the mounting and file copying? That's where logical volume management (LVM) is useful. Using LVM, disk space from multiple drives can be pooled into a single logical volume.

As with any new technology, there is a steep learning curve involved in using LVM, not the least of which is its vocabulary. Within this vocabulary, partitions are known as physical volumes, or pvs. We add pvs to a volume group that defines a logical volume on which we can create our file system.

On a heavily used system, the files being backed up can change during the backup, and the restored files might be in an unstable condition. LVM can also make snapshots of the logical volume that can then be mounted and backed up.

For more information on LVM under Linux, read the LVM HOWTO at http://tldp.org/HOWTO/LVM-HOWTO/, which explains the terminology and provides a guide to setting up and using LVM on a Linux system.

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