Increase The Size Of securetmp In cPanel

First stop all services that might be accessing /tmp:

/etc/init.d/cpanel stop
/etc/init.d/httpd stop
/etc/init.d/mysql stop

Next, unmount /tmp from the current secured mount:

umount -l /tmp
umount -l /var/tmp

Next, backup the current secured mount:

mv /usr/tmpDSK /usr/tmpDSK_back

Next, edit:

/scripts/securetmp

...and change the variable for $tmpdsksize to what size you want, in kilobytes

Next, run the securetmp script:

/scripts/securetmp

Finally, restart the services stopped previously:

/etc/init.d/cpanel start
/etc/init.d/httpd start
/etc/init.d/mysql start

You can confirm the size of /tmp by checking the output of:

df -h