lvm delete lv | lvm remove disk from vg

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Introduction:

In the world of Linux systems administration, Logical Volume Management (LVM) is a powerful tool that allows for flexible and efficient management of storage devices. However, there may come a time when you need to delete logical volumes (LV), volume groups (VG), or physical volumes (PV) from your LVM setup. In this article, we will walk through the step-by-step process of removing logical volumes in Ubuntu 20.04 LTS server.

My Environment: Ubuntu 20.04 LTS server

Removing Logical Volumes (LV):

To delete logical volumes in LVM, you need to follow a systematic process that involves removing the logical volume, volume group, and physical volume. Here are the steps to achieve this:

1. Identify Logical Volumes: Before you can delete a logical volume, you need to know which logical volumes are currently in use. You can use the `lvdisplay` command to list all logical volumes in your system.

2. Unmount the Logical Volume: Ensure that the logical volume you want to delete is not mounted. You can use the `umount` command to unmount the logical volume.

3. Deactivate the Logical Volume: Before you can delete a logical volume, you need to deactivate it. Use the `lvchange -an` command to deactivate the logical volume.

4. Delete the Logical Volume: Once the logical volume is deactivated, you can delete it using the `lvremove` command. For example, to delete a logical volume named `mylv`, you can use the command `lvremove /dev/myvg/mylv`.

Removing Volume Groups (VG):

After deleting the logical volumes, you can proceed to remove the volume group. Here's how you can do it:

1. List Volume Groups: Use the `vgdisplay` command to list all volume groups in your system.

2. Deactivate the Volume Group: Ensure that the volume group you want to delete is not in use. You can deactivate the volume group using the `vgchange -an` command.

3. Delete the Volume Group: To delete a volume group, use the `vgremove` command followed by the name of the volume group. For example, to delete a volume group named `myvg`, use the command `vgremove myvg`.

Removing Physical Volumes (PV):

Finally, after deleting the logical volumes and volume group, you can remove the physical volumes from your LVM setup:

1. List Physical Volumes: Use the `pvdisplay` command to list all physical volumes in your system.

2. Remove Physical Volumes from Volume Group: Before you can delete a physical volume, you need to remove it from the volume group. Use the `vgreduce` command to remove the physical volume from the volume group.

3. Delete the Physical Volume: Once the physical volume is removed from the volume group, you can delete it using the `pvremove` command. For example, to delete a physical volume named `/dev/sdb`, use the command `pvremove /dev/sdb`.

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