Turned out, smartd kept saying, that it had no entries in smartd.conf. I've copied smartd.rpmnew over smartd.conf, restarted it, now I have (in /var/log/messages, date+hostname removed): smartd version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen Home page is http://smartmontools.sourceforge.net/ Opened configuration file /etc/smartd.conf Configuration file /etc/smartd.conf was parsed, found DEVICESCAN, scanning devices Problem creating device name scan list Device: /dev/sda, opened Device /dev/sda: using '-d sat' for ATA disk behind SAT layer. Device: /dev/sda, opened Device: /dev/sda, not found in smartd database. Device: /dev/sda, is SMART capable. Adding to "monitor" list. Device: /dev/sdb, opened Device /dev/sdb: using '-d sat' for ATA disk behind SAT layer. Device: /dev/sdb, opened Device: /dev/sdb, not found in smartd database. Device: /dev/sdb, is SMART capable. Adding to "monitor" list. Monitoring 0 ATA and 2 SCSI devices smartd has fork()ed into background mode. New PID=3427. And the /etc/smartd.conf contains: DEVICESCAN -H -m root and the rest are comments. Do you think it is configured okay this way? My disk info is: # df -h Filesystem Size Used Avail Use% Mounted on /dev/md1 20G 1.7G 17G 9% / /dev/md3 176G 7.0G 160G 5% /var /dev/md0 993M 42M 901M 5% /boot /dev/md2 263G 2.0G 248G 1% /home tmpfs 2.0G 0 2.0G 0% /dev/shm # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb1[1] sda1[0] 1023936 blocks [2/2] [UU] md2 : active raid1 sdb5[1] sda5[0] 277728192 blocks [2/2] [UU] md3 : active raid1 sdb6[1] sda6[0] 185151360 blocks [2/2] [UU] md1 : active raid1 sdb3[1] sda3[0] 20479936 blocks [2/2] [UU] unused devices: <none>