How to create LVM in Linux?

How to create LVM in Linux?
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To create an LVM (Logical Volume Management) in Linux, you can follow these steps:

Note: These steps are based on the command-line method using the terminal. Make sure you have administrative privileges (root access) or use the "sudo" command to execute the commands.

Check available disks and partitions:
Run the following command to view the available disks and partitions on your system:

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sudo fdisk -l
Partition the disk:
Use a partitioning tool like "fdisk" or "parted" to create a partition on the disk you want to use for LVM. For example, if you want to use "/dev/sdb" for LVM, run the following command:

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sudo fdisk /dev/sdb
Create a new partition and mark it as Linux LVM (type 8e). Write the changes and exit the partitioning tool.

Initialize the Physical Volume (PV):
Run the following command to initialize the partition as an LVM Physical Volume (PV):

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sudo pvcreate /dev/sdb1
Replace "/dev/sdb1" with the actual partition you created in the previous step.

Create a Volume Group (VG):
Use the "vgcreate" command to create a Volume Group (VG) that will contain the Logical Volumes (LVs). Specify a name for the VG and the Physical Volume(s) to include. For example:

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sudo vgcreate myvg /dev/sdb1
Here, "myvg" is the name of the Volume Group, and "/dev/sdb1" is the Physical Volume.

Create Logical Volumes (LVs):
Use the "lvcreate" command to create Logical Volumes (LVs) within the Volume Group (VG). Specify the size and name for each LV. For example:

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sudo lvcreate -L 10G -n mylv myvg
This command creates an LV named "mylv" with a size of 10GB within the "myvg" Volume Group. Adjust the size and name according to your requirements.

Format the Logical Volumes:
Use the appropriate file system formatting command to format each Logical Volume. For example, to format the LV as ext4, use the following command:

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Replace "/dev/myvg/mylv" with the path to your specific LV.

Mount the Logical Volumes:
Create a directory where you want to mount the LV and then mount it using the "mount" command. For example:

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sudo mkdir /mnt/mylv
sudo mount /dev/myvg/mylv /mnt/mylv
Adjust the directory path and LV path according to your setup.

Optionally, add entries to /etc/fstab:
If you want the LV to be automatically mounted on system boot, you can add an entry to the "/etc/fstab" file. Open the file in a text editor and add a line similar to the following:

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/dev/myvg/mylv /mnt/mylv ext4 defaults 0 0
Save the file.

You have now created an LVM in Linux with a Physical Volume, Volume Group, and Logical Volume(s). The LV(s) can be used as regular partitions for storing data.