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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