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lvcreate – Used to create LVM logical volumes

The lvcreate command is used to create logical volumes in a Linux Logical Volume Manager (LVM) setup. It is used to allocate space from one or more physical volumes to create a logical volume that can be used for storing data. This command is useful when you need to add more storage space to an existing LVM setup or create a new LVM setup.

Overview

The lvcreate command can be used in various ways to create logical volumes with different specifications. The basic syntax of the command is as follows:

lvcreate [OPTIONS] VGNAME [LVNAME]

Here, VGNAME is the name of the volume group in which you want to create the logical volume, and LVNAME is the name of the logical volume you want to create. If you do not specify LVNAME, the command will create a logical volume with the same name as the volume group.

Creating a logical volume with default settings

To create a logical volume with default settings, you can use the following command:

lvcreate -n <lvname> -L <size> <vgname>

Here, <lvname> is the name of the logical volume you want to create, <size> is the size of the logical volume, and <vgname> is the name of the volume group in which you want to create the logical volume.

Creating a thin logical volume

To create a thin logical volume, you can use the following command:

lvcreate -T -V <size> <vgname>/<poolname>

Here, -T specifies that you want to create a thin logical volume, <size> is the size of the logical volume, and <vgname>/<poolname> is the name of the volume group and thin pool in which you want to create the logical volume.

Creating a snapshot logical volume

To create a snapshot logical volume, you can use the following command:

lvcreate -s -n <snapshot-lv> -L <size> <vgname>/<source-lv>

Here, -s specifies that you want to create a snapshot logical volume, <snapshot-lv> is the name of the snapshot logical volume you want to create, <size> is the size of the snapshot logical volume, and <vgname>/<source-lv> is the name of the volume group and source logical volume for which you want to create a snapshot.

Options

The following table lists the available options for the lvcreate command:

Option Description
-L, --size Specifies the size of the logical volume
-n, --name Specifies the name of the logical volume
-T, --thin Specifies that you want to create a thin logical volume
-V, --virtualsize Specifies the virtual size of the thin logical volume
-s, --snapshot Specifies that you want to create a snapshot logical volume
-h, --help Displays help information for the command

Troubleshooting tips

  • If you get an error message that the specified volume group does not exist, make sure that you have created the volume group before trying to create a logical volume in it.
  • If you get an error message that the specified logical volume already exists, try specifying a different name for the logical volume.

Notes

  • The lvcreate command requires root privileges to run.
  • When creating a logical volume, make sure that you have enough free space in the volume group to allocate to the logical volume.
  • When creating a thin logical volume, make sure that you have created a thin pool in the volume group before trying to create a thin logical volume.

Related commands