Volume manager in debian free#
Physical volumes can also be removed from an LVM volume group, as long as there is enough free space in the group to store data that used to be on the physical volume.
Volume manager in debian install#
If you began to run out of disk space and wanted to enlarge the filesystem, you could install a new hard disk, add it to the volume group and then enlarge the logical volume to make use of all the new free space! This is far more convenient than mounting the new hard disk as a subdirectory somewhere under the existing filesystem.
For example, if your system had two hard disks whose partitions were combined to form a volume group, you might have a filesystem on a logical volume that is as big as both disks combined. Additional physical volumes (such as newly installed hard disk partitions) can be added to an existing volume group, increasing the amount of free space. The most useful feature of LVM is the ability to re-size logical volumes and the filesystems within them, up to the amount of free space in the volume group. The only down side is that LVM does not support redundancy as RAID does in levels 1 and 5. However, it gives you far more freedom to carve up disks into separate filesystems that may take up part of a disk, several disks or anything in between. This space can be handed out to as many logical volumes as will fit into it, so that it could contain many small logical volumes or one huge one that spans multiple physical volumes (and thus partitions).Īt first glance, LVM may seem to be not much more powerful than RAID, which can also combine multiple partitions into one large filesystem. The size of each volume group is the sum of the sizes of all its physical volumes. From each volume group logical volumes can be created, on which filesystems are actually stored. Partitions managed by LVM are called a physical volumes, which are combined together to form volume groups. LVM ( Logical Volume Manager) is a powerful Linux feature that adds a layer of abstraction between the physical partitions on your system and the filesystems that they store.
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