CPanel: /var folder reaches size limit or reducing /var/cpanel/bandwidth folder size
Cpanel servers will get space limit issue if it is not configured properly and /var is created as a separate partition with less space.
The best solution was to move a folder that uses larger space to a different folder and then create a soft link for it
# mv /var/cpanel/bandwidth /home/bandwidth
# ln -s /home/bandwidth /var/cpanel/bandwidth
Note: Do clear assessments and take a system backup before doing it so that you can revert back if in case there occurs any issue.