There are several ways to read the temperature on Synolog NAS HDD. All of them use smartclt that is actual reading the S.M.A.R.T features of the storage device.
First, list the storage devices installed in your Synology NAS
smartctl --scan For us, it shows: /dev/hda -d ata # /dev/hda, ATA device /dev/sda -d scsi # /dev/sda, SCSI device /dev/sdc -d scsi # /dev/sdc, SCSI device
Use scttempsts to read the real value:
sudo smartctl -l scttempsts /dev/hda | grep Temp Current Temperature: 33 Celsius Power Cycle Min/Max Temperature: 25/41 Celsius Lifetime Min/Max Temperature: 20/44 Celsius Under/Over Temperature Limit Count: 0/0
Use -A to read all the temperatures and the Celsius temperature can be filtered using grep:
sudo smartctl -A /dev/hda | grep ATT ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE sudo smartctl -A /dev/hda | grep Temp 194 Temperature_Celsius 0x0022 110 099 000 Old_age Always - 33
