I reinstalled my server and I wanted to use smartmontools to monitor my disks (the last time one of them crashed). But the smartmont deamon wouldn’t start. By adding the following in /etc/smartd.conf the problems was solved:

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/dev/sda -s on -d ata
/dev/sdb -s on -d ata 

And I had to comment out the following:

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#DEVICESCAN -m root -M exec /usr/share/smartmontools/smartd-runner