welches Filesystem nutzt Du? ext4?
kommt der jbd2-Prozess so alle 5 Sekunden?
vielleicht liegts ja da dran:
http://www.kernel.org/doc/Documentation/filesystems/ext4.txt schrieb
commit=nrsec (*) Ext4 can be told to sync all its data and metadata
every 'nrsec' seconds. The default value is 5 seconds.
This means that if you lose your power, you will lose
as much as the latest 5 seconds of work (your
filesystem will not be damaged though, thanks to the
journaling). This default value (or any low value)
will hurt performance, but it's good for data-safety.
Setting it to 0 will have the same effect as leaving
it at the default (5 seconds).
Setting it to very large values will improve
performance.
in der fstab sieht das dann so aus:
/dev/sdaXY / ext4 defaults,commit=60,..... 0 1