My system became too slow last few days. The hard disk indicator is on all the time. To discover which process is keeping the disk busy i run this command:
# while true; do date; ps auxf | awk '{if($8=="D") print $0;}'; sleep 1; done | grep -v 2014
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
root 273 0.2 0.0 0 0 ? D Mar09 10:12 \_ [jbd2/sda7-8]
Unless there are many other programs including web browser, mysql-workbench, libreoffice, mediaplayer turning at the same time, but JDB2 is the top process using the system I/O !
How can i stop it safely or at least configure the system to disable it for the next boots.