What is logical volume management and how do you enable it. Logical volume management explained on linux devconnected. A volume manager puts the physical entities physical volumes into storage pools called volume groups. Linux lvm is very similar to hpux lvm and provides.
Regular file systems, such as ext3 or ext4, can then be created on a logical volume. As everything in unix linux, the logical volume management is controlled using command line tools. Logical volume management lvm introduces an abstraction between physical and logical storage, allowing a more versatile use of filesystems. That volume group can then be subdivided into logical volumes lv or used as a single large volume. Merge your available disks pvs into one storage space vg. Logical volume management lvm is a method used by linux to manage storage volumes across different physical hard disks. Lvm allows for very flexible disk space management. Beginners guide to lvm logical volume management the. Logical volume management enables the combining of multiple individual hard drives andor disk partitions into a single volume group vg.
With lvm snapshots, we can run a full backup of a running system without having. Lvm or logical volume management is a disk management tool that makes it easier to manage disk space. Learn the terminology and basics of lvm in this video. Logical volume manager administration red hat customer portal. Logical volume management was built in the first place to fix most of the shortcomings associated with regular disk management on linux. Lets learn a little about linux s lvm in preparation for lvm snapshot backups. Command line tools, ascii ui yast1, graphical ui yast2 command line. Lvm uses the linux device mapper feature devmapper. Logical volume manager administration red hat enterprise linux 7. This presentation show the how to work with lvm logical volume management on linux. How to manage and use lvm logical volume management in.
Logical volume manager allows for a layer of abstraction between your operating system and the disks. For a list see the appendix b or the manual page for lvm8 on your system. Whether you need to set up storage pools or just need to dynamically create partitions, lvm is probably what you are looking for. To make the file system use the entire 11 gb available you have to use the command resize2fs. Just point resize2fs to the 11 gb logical volume and it will do the magic for you.
However, it can be thought of in a similar concept as raid 0 or jbod. Linux lvm logical volume management linkedin slideshare. A linux users guide to logical volume management opensource. It provides features like the ability to add disk space to a logical volume and its filesystem. Lvm or logical volume management is a disk partition management utility.
One major advantage of lvm is the fact that you are able to reassemble your space while your system is running. Logical volume manager administration red hat enterprise. With the help of lvm we can easily manage our partitions we can extend our partitions reduce them replace a failing disk or adding new disk to increase the capacity. The logical volume is 11 gb but the file system on that volume is still only 3 gb. In linux, logical volume manager lvm is a device mapper target that provides logical volume management for the linux kernel.