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How to resize hard drive on Linux systems with LVM

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Nikolay Zhmuk
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Applicable to:

  • Plesk for Linux

Question

The free disk space is exceeded on the server. Disk size for the server has been extended from the hardware node side of the virtualization, however these changes are not being reflected from the inside of the virtual machine. How to extend disk size inside of the virtual machine that uses LVM?

Answer

WARNING: The following article is applicable for the systems that use LVM  only. Before applying the steps below, create a backup of the virtual machine.

Note: That such task is not-Plesk related and does not covered by Plesk Technical Support. If you are not familiar with Linux system administering and would like our professionals handle this task, contact Professional Service team using the following link:
https://www.plesk.com/help-center/professional-services/administrative-services

  1. Connect to the server using SSH

  2. Install system-storage-manager package:

    RHEL-like systems:

    # yum install system-storage-manager

    Debian-like systems:

    # apt-get install system-storage-manager

    This tool allows to get infromation about devices,pools and volumes and manage them easily.

  3. List information about all detected, devices, pools, volumes and snapshots in the system:

    ssm_list.png

  4. If there are only old devices listed (/dev/sda, /dev/sda1, /dev/sda2) and no new devices, it means that added free space is unallocated. There are various tools to create a partition, such as parted, fdisk, cfdisk. cfdisk has text user interface and easy to use:

    • run cfdisk tool:

      # cfdisk

    • unallocated disk space will have Free Space FS Type

      cfdisk.png

    • select unallocated disk space and create a new partition by clicking on [ New ] button. Follow the wizard to set primary/logical partition, partition size. When partition is created, file system type can be changed in [    Type    ] menu item (Linux type can be used as default one)

    • click [    Write    ] and [    Quit    ] to confirm changes. Run partprobe to apply changes:

      # partprobe

    • Check that new device is added:

      ssm_list2.png

  5. Once new device is configured, it is possible to add a new device to logical group:

    # vgextend centos /dev/sda4
    Physical volume "/dev/sda4" successfully created
    Volume group "centos" successfully extended

  6. Then extend logical volume of root directory to +10GB added free space:

    # ssm resize -s+9.99G /dev/centos/root

  7. Check that the disk space has extended:

    # df -h

Comments

2 comments

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  • Avatar
    Sivaji

    Hello,

     

    I followed the steps mentioned above, my server does not have Pool name such as Centos. so the command - vgextend centos /dev/sda4 Is not working please advice. Screesnhot below. 

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  • Avatar
    Ivan Postnikov

    @Sivaji,

    Hello!

    This article is not applicable to your server as LVM is not used. 

    To learn more about LVM, check official CentOS article.

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