If I disable the journaling function of an EXT4-filesystem using the command
tune2fs -O ^has_journal /dev/sda and enable it after the next start, will the data saved on the harddisk remain unaffected or are they lost ?
(Ubuntu 16.04 LTS)
As already told tools like
iostat haven't been were helpful.
blktrace -d /dev/sda -o - | blkparse -i - showed me that
smartctl and one other process (
udevd ?) accessed the disc.
Strangely enough no config-file had smartctl enabled....
auditd finally helped me to track down the troublemaker, revealing the correlation between the start of smartctl and
webmin checks periodically the temperature of the harddisks, this option can be disabled in
Webmin --> Webmin --> Configuration --> Background Status Collection. One should also disable the options
Collect system status in background and
Collect available package updates.