- Logical
volumes can be resized while they are mounted and accessible by the
database or file system, removing the downtime associated with adding
or deleting storage from a Linux server
- Data from one
(potentially faulty or damaged) physical device may be relocated to
another device that is newer, faster or more resilient, while the
original volume remains online and accessible
- Logical
volumes can be constructed by aggregating physical devices to increase
performance (via disk striping) or redundancy (via disk mirroring and
I/O multipathing)
- Logical volume snapshots can be created to
represent the exact state of the volume at a certain point-in-time,
allowing accurate backups to proceed simultaneously with regular system
operation
http://www.redhat.com/magazine/009jul05/features/lvm2/
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