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In the previous chapter we looked at adding a new disk drive to a Fedora system, creating a partition and file system and then mounting that file system so that the disk can be accessed. An alternative to creating fixed partitions and file systems is to use Logical Volume Management (LVM) to create logical disks made of space from one or more physical disksor partitions. The advantage of using LVM is that space can be added to or removed from logical volumes as needed without the need to spread data over multiple filesystemsfile systems.
Let us take, for example, the root (/) file system. Without LVM this filesystem would be created with a certain size when the operating is installed. If a new disk drive is installed there is no way to allocate any of that space to the / filesystem. The only option would be to create new filesystems on the new disk and mount it at a particular mount point. In this scenario you would have plenty of space on the new filesystem by the / filesystem would still be nearly full. The only option would be to move files onto the new filesystem. With LVM, the new disk (or part thereof) can be assigned to the logical volume contain the root file system thereby extending the space available.
