4/1/2023 0 Comments Logical volume manager ubuntu![]() ![]() A physical space of 4 TB was not in use at first. I created 2 LVs when installing Ubuntu Server 16.04 LTS on a computer: /home which is users’ home directory and /store for data storage. LV (logical volume): (virtual) volume created on VG.VG (volume group): (virtual) group based on at least one PV.PV (physical volume): actual disk or partions on it.For people who want to overcome volume shortage in their workstations/servers, it is a economic and brilliant choice. ![]() With LVM, however, we can combine different physical volumes together and always add new space to an exsiting LVM partition in principle. Traditionally, if we add a new hard drive to an exsiting Linux computer, we would assign a new mount point to the disk, and use some techniques to mount automatically at startup for convenience. The most attractive feature of LVM to me, is the capability to resize the disk volume dynamically. Since version 12.10, Ubuntu has introduced LVM support in the installation process. LVM (Logical Volume Manager) is a powerful tool for logical volume management on Linux systems. That’s all! We have demonstrated how you can easily extend the LVM file system on your Ubuntu 20.04 Server.Be careful with your disk when reading this note and similar ones. One last command is needed so that the “df -h” output shows the correct size of your file system: sudo resize2fs -p /dev/mapper/ubuntu-vg-ubuntu-lv Your LVM Disk has now been successfully extended. Now we need to extended the Logical volume as follows: sudo lvm lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv Output: Volume group “ubuntu-vg” successfully extended. Type the command: sudo vgextend ubuntu-vg /dev/vdb From the first commands in this tutorial, we have noted “ubuntu-lv” as the logical volume name, and “ubuntu-vg” as the volume group name. We will no add our new PV (/dev/vdb) to our existing logical volume. Add the new Physical Volume (PV) to our Existing Logical Volume (LV) Output: Physical volume “/dev/vdb” successfully created. We are now good to go to create our new disk as Physical Volume on the server: sudo pvcreate /dev/vdb ![]() Type the following command to identify the new disk you have attached: sudo fdisk -l Once you do this, we need to configure it within the existing LVM file system. Whether your Ubuntu 20.04 is a Virtual machine or installed on a Bare-metal dedicated server, you will need to attach/insert the new disk (virtual or physical). With this information, we can proceed to extend our disk. Our server has one Volume Group named “ubuntu-vg”, which has one Logical Volume “ubuntu-lv”. Next, we will issue the following command to find out information about the Logical Volume: sudo lvdisplayĪs per our example above, we need to make a note of the following useful information: Do it by typing this command: sudo vgdisplay Now we need to find out the Volume group name. To find out the physical volumes (PV) used by the LVM file system, run this command: sudo pvs Collect information about current LVM settings and names Information about the PV, VG and LV are important in order to successfully resize our LVM disk. Logical Volume (LV) - a volume group is divided into several Logical Volumes, i.e.Volume Group (VG) - physical volumes/disks are combined into volume groups, i.e.Physical Volume (PV) - this is the actual disk, i.e.It is a system of managing logical volumes, or filesystems, that is much more advanced and flexible than the traditional method of partitioning a disk into one or more segments and formatting that partition with a filesystem ( source: ). LVM stands for Logical Volume Management. Resizing disks is a common yet challenging task for system administrators, when servers are running out usable disk space or when the standard partitioning during installation does not fit their bespoke needs. In this tutorial, we will show you how to extend an LVM disk on your Ubuntu 20.04 Server. ![]()
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