I did check and the process was not running for some strange reason don't know why.
but I did re-run the command that I have been writting above and then I did see this run in the background.
seafile 4566 0.0 0.0 12588 3084 pts/0 S 14:36 0:00 /bin/bash /opt/nohatech/seafile-server-latest/seaf-fsck.sh
seafile 4571 16.0 0.1 80528 7840 pts/0 D 14:36 0:25 /opt/nohatech/seafile-server-6.2.3/seafile/bin/seaf-fsck -c /opt/nohatech/ccnet -d /opt/nohatech/seafile-data -F /opt/nohatech/conf
To see what's running in the background you need to do the following command: ps aux | less