I didn't realize a problem on my productive system, but on a Vagrant dev system i found the following syslog entry:
Code
Aug 26 16:51:37 omv4box smartd[3564]: smartd 6.6 2016-05-31 r4324 [x86_64-linux-4.9.0-7-amd64] (local build)
Aug 26 16:51:37 omv4box smartd[3564]: Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
Aug 26 16:51:37 omv4box smartd[3564]: Opened configuration file /etc/smartd.conf
Aug 26 16:51:37 omv4box smartd[3564]: Configuration file /etc/smartd.conf parsed.
Aug 26 16:51:37 omv4box smartd[3564]: Device: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-1, opened
Aug 26 16:51:37 omv4box smartd[3564]: Device: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-1, [QEMU QEMU HARDDISK 2.5+], 1.07 GB
Aug 26 16:51:37 omv4box smartd[3564]: Device: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-1, IE (SMART) not enabled, skip device
Aug 26 16:51:37 omv4box smartd[3564]: Try 'smartctl -s on /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-1' to turn on SMART features
Aug 26 16:51:37 omv4box smartd[3564]: Unable to register SCSI device /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-1 at line 9 of file /etc/smartd.conf
Aug 26 16:51:37 omv4box smartd[3564]: Device /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-1 not available
Aug 26 16:51:37 omv4box smartd[3564]: Monitoring 0 ATA/SATA, 0 SCSI/SAS and 0 NVMe devices
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Maybe SMART is also not enabled for your device.
To check the syslog output simply monitor it's output in a separate shell via
and restart smartd on another one via