Every night, cPanel runs the script /scripts/smartcheck to read the SMART diagnostic information from the drive (using smartctl) and warn the system administrator if the drive is having problems. But smartcheck defines “problems” as including the case where the ATA Error Count in 100 or more.

The ATA Error Count is the number of errors recorded by the SMART circuitry on the drive, and this count is cumulative over the life of the drive. Since all drives experience some errors in the course of normal operation, the ATA Error Count will always become greater than 100 at some point, regardless of whether the drive is failing or not. Thus, cPanels smartcheck script will start to produce incorrect warnings when the error count reaches 100.

To prevent these false warnings from being sent, you must disable smartcheck.
Login as root to your server, then run this command:

# touch /var/cpanel/disablesmartcheck

Done!