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What is logical volume in storage?

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What is logical volume in storage?

Logical volumes are groups of information located on physical volumes. A hierarchy of structures is used to manage disk storage. Each individual disk drive, called a physical volume (PV) has a name, such as /dev/hdisk0. Every physical volume in use belongs to a volume group (VG).

What can the Logical Volume Manager LVM be used for?

What is LVM? LVM is a tool for logical volume management which includes allocating disks, striping, mirroring and resizing logical volumes. With LVM, a hard drive or set of hard drives is allocated to one or more physical volumes.

What is the use of logical volume?

Logical Volume Management enables the combining of multiple individual hard drives and/or disk partitions into a single volume group (VG). That volume group can then be subdivided into logical volumes (LV) or used as a single large volume.

What is difference between LVM and standard partition?

In my opinion the LVM partition is more usefull cause then after installation you can later change partition sizes and number of partitions easily. In standard partition also you can do resizing, but total number of physical partitions are limited to 4. With LVM you have much greater flexibility.

How do you manage logical volumes?

Here are all of the steps necessary to create a new logical volume.

  1. Create physical volume.
  2. Create volume Group.
  3. Create logical volume.
  4. Format and Mount the Logical Volume.
  5. Install and Format new Hard Drive.
  6. Add New Hard Drive to Volume Group.
  7. Extend Logical Volume.
  8. Extend File System.

What is PE size in LVM?

PE Size – Physical Extends, Size for a disk can be defined using PE or GB size, 4MB is the Default PE size of LVM.

Why does Linux need LVM?

Uses. 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 major advantage of using logical volume management?

The main advantages of LVM are increased abstraction, flexibility, and control. Logical volumes can have meaningful names like “databases” or “root-backup”. Volumes can be resized dynamically as space requirements change and migrated between physical devices within the pool on a running system or exported easily.

Why we use LVM in Linux?

What is difference between LVM1 and LVM2?

What is the difference between LVM1 & LVM2? LVM2 uses device mapper driver contained in 2.6 kernel version. LVM1 was included in the 2.4 series kernels.