Frequent question: What is LVM in Linux interview question?

LVM stands for Logical Volume Manager. LVM, is a storage management solution that allows administrators to divide hard drive space into physical volumes (PV), which can then be combined into volume groups (VG), which are then divided into logical volumes (LV) on which the filesystem and mount point are created.

Why LVM is used in Linux?

LVM is used for the following purposes: Creating single logical volumes of multiple physical volumes or entire hard disks (somewhat similar to RAID 0, but more similar to JBOD), allowing for dynamic volume resizing.

What is LVM explain?

Logical volume management (LVM) is a form of storage virtualization that offers system administrators a more flexible approach to managing disk storage space than traditional partitioning. … The goal of LVM is to facilitate managing the sometimes conflicting storage needs of multiple end users.

What is LVM and when why would you use it?

LVM, or Logical Volume Management, is a storage device management technology that gives users the power to pool and abstract the physical layout of component storage devices for easier and flexible administration.

How do I use LVM in Linux?

5.1. Creating an LVM Logical Volume on Three Disks

  1. To use disks in a volume group, label them as LVM physical volumes with the pvcreate command. …
  2. Create the a volume group that consists of the LVM physical volumes you have created. …
  3. Create the logical volume from the volume group you have created.

How do I start LVM in Linux?

The procedure to mount LVM partition in Linux as follows:

  1. Run vgscan command scans all supported LVM block devices in the system for VGs.
  2. Execute vgchange command to activate volume.
  3. Type lvs command to get information about logical volumes.
  4. Create a mount point using the mkdir command.

Is LVM worth using?

LVM can be extremely helpful in dynamic environments, when disks and partitions are often moved or resized. While normal partitions can also be resized, LVM is a lot more flexible and provides extended functionality. As a mature system, LVM is also very stable and every Linux distribution supports it by default.

How can we reduce LVM?

How to reduce LVM partition size in RHEL and CentOS

  1. Step:1 Umount the file system.
  2. Step:2 check the file system for Errors using e2fsck command.
  3. Step:3 Reduce or Shrink the size of /home to desire size.
  4. Step:4 Now reduce the size using lvreduce command.

Is LVM a file system?

LVM stands for Logical Volume Management. It is a system of managing logical volumes, or filesystems, that is much more advanced and flexible than the traditional method of partitioning a disk into one or more segments and formatting that partition with a filesystem.


LVM is like RAID-0, there is no redundancy. With the data striped across all four disks, there is a 7.76% chance of one disk crashing and all data being lost. Conclusion: LVM does not have redundancy, neither does RAID-0, and backups are extremely important. Also, don’t forget to test your recovery process!

How do I know if LVM is used?

Try running lvdisplay on command line and is should display any LVM volumes if they exist. Run df on the MySQL data directory; this will return the device where the directory resides. Then run lvs or lvdisplay to check if the device is an LVM one.

Should I use LVM when installing Ubuntu?

If you are using Ubuntu on a laptop with only one internal hard drive and you don’t need extended features like live snapshots, then you may not need LVM. If you need easy expansion or want to combine multiple hard drives into a single pool of storage then LVM may be what you have been looking for.

Like this post? Please share to your friends:
OS Today