If you already have important data on your server, make backups before proceeding. Using these devices within LVM will overwrite the current contents.
Warning: Make sure that you double-check that the devices you intend to use with LVM do not have any important data already written to them. This specifies that LVM can use the device within a volume group.įirst, use the lvmdiskscan command to find all block devices that LVM can see and use: In order to use storage devices with LVM, they must first be marked as a physical volume. Creating Physical Volumes From Raw Storage Devices
#Ubuntu logical volume manager how to
This section will discuss how to create and expand physical volumes, volume groups, and logical volumes. This information is useful if you need to remove that underlying device and wish to move the data off to specific locations. LV Creation host, time lvmtest, 21:00:03 +0000Īs you can see from the output towards the bottom, the /dev/LVMVolGroup/projects logical volume is contained entirely within the /dev/sda physical volume in this example. LV UUID IN4GZm-ePJU-zAAn-DRO3-1f2w-qSN8-ahisNK To display all of the available block storage devices that LVM can potentially manage, use the lvmdiskscan command:
Displaying Information about All LVM Compatible Block Storage Devices Fortunately, the LVM tool suite provides an abundant amount of tools for displaying information about every layer in the LVM stack. It is important to be able to get information about the various LVM components in your system easily. Displaying Information about Physical Volumes, Volume Groups, and Logical Volumes When you are ready, log into your server with your sudo user. To get familiar with LVM components and concepts and to test out a basic LVM configuration, follow our introduction to LVM guide prior to starting on this tutorial. You can follow our Ubuntu 18.04 initial server setup guide to create the necessary account. You will need to have a non-root user with sudo privileges configured for administrative tasks. In order to follow along, you should have access to an Ubuntu 18.04 server. We will be using an Ubuntu 18.04 server to demonstrate these operations. We will show you how to display information about volumes and potential targets, how to create and destroy volumes of various types, and how to modify existing volumes through resizing or transformation. In this guide, we will cover how to manage your storage devices with LVM. Utilizing the device mapper Linux kernel framework, the current iteration, LVM2, can be used to gather existing storage devices into groups and allocate logical units from the combined space as needed. If no errors, then you’re all set.LVM, or Logical Volume Management, is a storage device management technology that gives users the power to pool and abstract the physical layout of component storage devices for easier and flexible administration. Note: For all of the below commands, change “sdc” to match your disk’s identifier Convert the new disk to be an LVM physical volume pvcreate /dev/sdc Create the volume group vgcreate vg_extra /dev/sdc Check the volume group vgdisplay Create a logical volume (named lv_logs in this example) lvcreate vg_extra -L 5G -n lv_logs Format the logical volume mkfs.ext4 /dev/mapper/vg_extra-lv_logs Create a directory to mount the new logical volume mkdir /mnt/extra/logs Mount the logical volume mount /dev/mapper/vg_extra-lv_logs /mnt/extra/logs Find the “block id” of the new logical volume blkid /dev/mapper/vg_extra-lv_logs Back up your fstab file to be safe cp /etc/fstab /etc/fstab.bak Edit the fstab file nano /etc/fstab Add a line to the fstab to mount the volume, similar to this UUID= /mnt/extra/logs ext4 defaults 0 2 Test the new mount, first making sure it’s not mounted umount /mnt/extra/logs Then test your fstab file (BEFORE rebooting) mount -a Note: Make sure you change “sdb” to the identifier of your drive): pvcreate /dev/sdb Add the new physical volume to the volume group vgextend vg_ubuntu /dev/sdb Check the status vgdisplay Extend the physical volume by 10GB (or however many “GB” you want) lvextend -L +10G /dev/mapper/vg_ubuntu-lv_root Grow the logical volume with ALL of the available space, without specifying a particular size lvextend -resizefs -l +100%FREE /dev/mapper/vg_ubuntu-lv_root Grow the filesystem to match the newly available space resize2fs /dev/mapper/vg_ubuntu-lv_root Check current available space df -h Creating a brand-new LVM setupĪdd a new virtual or physical disk to the server. Convert the new disk to an LVM physical volume First, get a tiny bit of space back for tmp files (this command clears apt caches and etc): sudo apt clean Extend the logical volume lvextend -resizefs -l +100%FREE /dev/mapper/vg_ubuntu-lv_root Adding a disk to LVMĪfter adding a physical or virtual disk to the server, run the following commands.
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