Expanding disk size in CentOS8

I thought increasing the disk size from VM Fusion settings will do the job.

Took quite a while to disillusion me…

To see the current disk sizes:

fdisk -l

To enter the operational mode:

fdisk /dev/sda

Then you have to type ‘p’ for partition to see the disk profile again.

Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 2099199 2097152 1G 83 Linux
/dev/sda2 2099200 41943039 39843840 19G 8e Linux LVM

The main process starts by typing ’n’ to create a new partition. The newly created partition (/dev/sda3) ID is defaulted to 83 and needs to be changed to 8e by typing ‘l’ to see the hex codes. Typing ‘8e’ will complete the task. Now press ‘w’ to save and exit.

Time for a reboot and the running the following as sudo to finalise the expansion for sda2 (in my observation by merging with sda3). As you see from the difference in line numbers, I had to go through a lot of errors…

  106  reboot
  107  pvcreate /dev/sda3
  108  vgdisplay 
  110  vgextend cs /dev/sda3
  111  lvdisplay 
  115  lvextend /dev/cs/root /dev/sda3
  119  xfs_growfs /dev/cs/root
  120  df -h

But it was worth it: 18G used of 100.

(base) [user@localhost ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cs-root 100G 18G 83G 18% /