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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.

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Upgrading your distribution should solve your problem.

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    I temporarily solved that by killing jdb2 process. But later i upgraded the dist. Indeed it's it was the solution.
    – Slyx
    Jun 4, 2014 at 22:02

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