Hddtemp

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hddtemp is a small utility (with daemon) that gives the hard-drive temperature via S.M.A.R.T. (for drives supporting this feature).

Installation

Install hddtemp from the official repositories.

Usage

Hddtemp requires root privileges. The command hddtemp must be followed by at least one drive's location, with several directories separated by spaces:

# hddtemp /dev/sdX1 /dev/sdX2 ... /dev/sdXn

Daemon

Running the daemon allows to access the temperature via TCP/IP, to use for example with scripts.

The daemon is controlled by hddtemp.service.

Note: Arguments to hddtemp are directly given in /usr/lib/systemd/system/hddtemp.service. This is especially important with multiple disks, as the default configuration only monitors /dev/sda. Change ExecStart to override hddtemp.service:
  • Create a directory in /etc/systemd/system:
# mkdir /etc/systemd/system/hddtemp.service.d
  • Create customexec.conf inside and add the drives you want to monitor, e.g.:
/etc/systemd/system/hddtemp.service.d/customexec.conf
[Service]
ExecStart=
ExecStart=/usr/bin/hddtemp -dF /dev/sda /dev/sdb /dev/sdc

You can also the auto-generate script that detects with help of smartmontools all supported by hddtemp hard-drivers and generating to the stdout the customexec.conf pattern file.

To get the temperature, connect to the daemon which listens on port 7634. With inetutils:

$ telnet localhost 7634

With gnu-netcat:

$ nc localhost 7634

Both outputs are similar to:

|/dev/sda|ST3500413AS|32|C||/dev/sdb|ST2000DM001-1CH164|36|C|

For a better looking statistic:

$ nc localhost 7634 |sed 's/|//m' | sed 's/||/ \n/g' | awk -F'|' '{print $1 " " $3 " " $4}'
/dev/sda 32 C 
/dev/sdb 36 C

Refer to the manpage for more information:

$ man hddtemp

Monitors

Hddtemp can be integrated with system monitors.

Solid State Drives

Hddtemp usually reads field 194 from the smart data of the drive. In SSDs temperature information is usually stored in field 190. To obtain this information, one can run:

$ smartctl -a /dev/sdX

or

$ hddtemp --debug /dev/sdX

where X is a character (e.g. a,b,c...) representing the drive. Use lsblk to check this.

Alternatively, add a new entry in /usr/share/hddtemp/hddtemp.db. For example:

$ echo '"Samsung SSD 840 EVO 250G B" 190 C "Samsung SSD 840 EVO 250GB"' >> /usr/share/hddtemp/hddtemp.db