How to check Disk Usage

Checking whether the root partition has run out of inodes. Use the command. If it shows 100%, there are many small files. Perhaps, do look for some of these files at /tmp

df -i
Filesystem                                      Inodes        IUsed        IFree IUse% Mounted on
/dev/mapper/centos-root                        9788840       320849      9467991    4% /
devtmpfs                                      70101496          560     70100936    1% /dev
tmpfs                                         70105725            8     70105717    1% /dev/shm
tmpfs                                         70105725         1581     70104144    1% /run
.....
.....

You may want to check which directories is using the most space with the commands below

% du -hx -d 1 |sort -h
1.3M    ./Espresso-BEEF
4.9M    ./NB07
8.3M    ./Gaussian2
31M     ./Gaussian
65M     ./MATLAB
478M    ./Abaqus
647M    ./pytorch-GAN
10G     ./COMSOL
12G     .

-h argument produces the human-readable output
-x restricts the search to the current directory
-d 1 is the summary for each directory
sort -h produces human-readable output and the directories with the largest usage will appear at the bottom of the list.