Adjusting a Partition After Enlarging a Block Storage

This article describes how to edit a partition after you enlarge block storage in Linux.

  • You restarted the server after increasing the block storage size.

  • You have logged on to the server as administrator.

  • Install the growpart program.

    [root@localhost ~]# apt-get update
    [root@localhost ~]# apt-get install cloud-initramfs-growroot

    CentOS 7 and CentOS 8:
    [root@localhost ~]# yum install cloud-utils-growpart

  • To list the block of storage that is assigned to the server, enter the following command:
    [root@localhost ~]# lsblk After entering the command, you will be shown all the important information about the existing disks and the assigned block of storage that you have enlarged.

    [root@localhost ~]# lsblk
    sda               8:0    0  100G  0 disk
    ├─sda1            8:1    0  512M  0 part /boot
    └─sda2            8:2    0 99.5G  0 part
      ├─centos-root 253:0    0 97.5G  0 lvm  /
      └─centos-swap 253:1    0    2G  0 lvm  [SWAP]
    sdb               8:16   0   40G  0 disk
    └─sdb1            8:17   0   20G  0 part /mnt/block
    sr0              11:0    1 1024M  0 rom
    In the above example, the server is assigned a block of storage, the size of which has been increased from 20 GB to 40 GB. This block has the name sdb.

  • Use the following growpart command to expand the first partition on the Storage block. Note that there is a space between the device name and the partition number.
    [root@localhost ~]# growpart /dev/dev/dev_name 1
    [root@localhost ~]# growpart /dev/sdb 1

  • To customise the ext4 file system, type the following command:
    [root@localhost ~]# resize2fs -p /dev/sdb1


If the file system is not enlarged, restart the server. Then enter the command resize2fs -p /dev/sdb1 again.

  • To check the available space of the Block Storage, type the following command:
    [root@localhost ~]# df -h You will then see the new size of the Block Storage.

    Example: [root@localhost ~]# df -h
    Filesystem               Size  Used Avail Use% Mounted on
    devtmpfs                 1.9G     0  1.9G   0% /dev
    tmpfs                    1.9G     0  1.9G   0% /dev/shm
    tmpfs                    1.9G   17M  1.9G   1% /run
    tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
    /dev/mapper/centos-root   98G  2.3G   96G   3% /
    /dev/sdb1                 40G   48M   38G   1% /mnt/block
    /dev/sda1                507M  228M  280M  45% /boot
    tmpfs                    376M     0  376M   0% /run/user/0

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