“The Linux Logical Volume Manager (LVM) is a mechanism for
virtualizing disks. It can create ‘virtual’ disk partitions out of
one or more physical hard drives, allowing you to grow, shrink, or
move those partitions from drive to drive as your needs change. It
also allows you to create larger partitions than you could achieve
with a single drive.“Traditional uses of LVM have included databases and company
file servers, but even home users may want large partitions for
music or video collections, or for storing online backups. LVM and
RAID 1 can also be convenient ways to gain redundancy without
sacrificing flexibility…”