Если актуально, то данная проблема может возникать из-за режима энергосбережения дисков. Необходимо уточнить параметры в /etc/smartd.conf.
spoilerPower management
If you use a computer under control of power management, you should instruct smartd how to handle disks in low power mode. Usually, in response to SMART commands issued by smartd, the disk platters are spun up. So if this option is not used, then a disk which is in a low-power mode may be spun up and put into a higher-power mode when it is periodically polled by smartd.
/etc/smartd.conf
DEVICESCAN -n standby,15,q
More info on smartmontools wiki.
On some devices the -n does not work. You get the following error message in syslog:
journalctl -u smartd
CHECK POWER MODE: incomplete response, ATA output registers missing
Device: /dev/sdb [SAT], no ATA CHECK POWER STATUS support, ignoring -n Directive
As an alternative you can user -i option of smartd. It controls how often smartd spins the disks up to check their status. Default is 30 minutes. To change it create and edit /etc/default/smartmontools.
/etc/default/smartmontools
SMARTD_ARGS="-i 10800" Check status every 10800 seconds (3 hours)
For more info see smartd(8).