1HDDTEMP(8) System Manager's Manual HDDTEMP(8)
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6 hddtemp - Utility to monitor hard drive temperature
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9 hddtemp [options] [type:]disk...
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12 hddtemp will give you the temperature of your hard drive by reading
13 Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) infor‐
14 mation on drives that support this feature. Only modern hard drives
15 have a temperature sensor. hddtemp supports reading S.M.A.R.T. infor‐
16 mation from SCSI drives too. hddtemp can work as simple command line
17 tool or as a daemon.
18 You can specify one or more device drive path, where each path can be
20 prefixed with a type like PATA, SATA or SCSI to force hddtemp too use
21 one of these type (because detection can fail).
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26 The program follows the usual GNU command line syntax, with long
27 options starting with two dashes (`-'). A summary of options is
28 included below.
29 -b, --drivebase
31 Display the database file that allows hddtemp to recognize a
32 supported drive.
33 -D, --debug
35 Display various S.M.A.R.T. fields and their values. Useful for
36 finding a value that seems to match the temperature and/or to
37 send a report. (done for every drive supplied)
38 -d, --daemon
40 Execute hddtemp in TCP/IP daemon mode (port 7634 by default).
41 -f, --file=file
43 Specify the database file to use. -F, --foreground
44 Don't fork into the background even in daemon mode. This is useful
46 when running under a process supervisor.
47 -l, --listen=addr
49 Listen on a specific address. addr is a string containing a
50 host name or a numeric host address string. The numeric host
51 address string is a dotted-decimal IPv4 address or an IPv6 hex
52 address.
53 -n, --numeric
55 Print only the temperature (without the unit).
56 -p, --port=#
58 Port number to listen to (in TCP/IP daemon mode).
59 -s, --separator=char
61 Separator to use between fields (in TCP/IP daemon mode). The
62 default separator is `|'.
63 -S, --syslog=s
65 Switch to daemon mode and log temperatures to syslog every s
66 seconds.
67 -q, --quiet
69 Don't check if the drive is supported.
70 -v, --version
72 Display hddtemp version number.
73 -w, --wake-up
75 Wake-up the drive if needed (ATA drives only).
76 -4 Listen on IPv4 sockets only.
78 -6 Listen on IPv6 sockets only.
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84 If you know your drive has a temperature sensor but it is being
85 reported unsupported, tell me which model and which manufacturer it is,
86 and/or just add a new entry in /usr/share/misc/hddtemp.db. Each line
87 of hddtemp.db is either a comment, a blank line or a line containing:
88 - a regular expression that allow hddtemp to recognize a drive or a
90 set of drives from its model name or from a generic model name,
91 - a value (ATTRIBUTE_ID from S.M.A.R.T.),
93 - a C or an F to set the unit to Celsius or Fahrenheit,
95 - a description.
97 Feedback is welcome (see the REPORT section below).
99
102 Exemple of type forcing:
103 # hddtemp SATA:/dev/sda PATA:/dev/hda
105 To test hddtemp in daemon mode, start it like this:
107 # hddtemp -d /dev/hd[abcd]
109 and use telnet or netcat (which is known as nc on some systems) to get
111 a reply:
112 # netcat localhost 7634
114 The drive database is read only once at startup, so hddtemp must be
116 restarted if the database is updated for the changes to take effect.
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120 As I receive a lot of reports, things must be clarified. When running
121 hddtemp with debug options, hddtemp will show sort of a dump of
122 S.M.A.R.T. data. Each field corresponds to an information field. The
123 standard field for drive temperature is 194. But this is not always
124 the case (mostly for older drives). Even if your drive has S.M.A.R.T.
125 capabilities, it doesn't necessarily mean that it can report its tem‐
126 perature. So, things must be determined through experimentation.
127 So, you can try to guess which field by is the good one by running
129 hddtemp at regular intervals:
130 - just after starting up your PC/server/station,
132 - after opening a window (a physical window :),
134 - after opening the case,
136 - whatever you can think of...
138 and looking for a field's value that would increase or decrease depend‐
140 ing on what effect you want to induce. Be careful, fields 4, 9, and 12
141 are often reported to match a temperature field but after some investi‐
142 gation they do not. But fields 194 (which is the standard field for
143 temperature) and 231 are good candidates.
144 Then, you can send me a report with outputs from `hddtemp --debug ...',
146 `smartctl' or `hdparm -i ...', and/or add an entry in hddtemp.db your‐
147 self.
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151 If hddtemp crashes (yes, it might) for some unknown reasons, look for a
152 file named hddtemp.backtrace.<PID>.XXXXXX (where XXXXXX is a random
153 number generated at runtime) in /tmp. Then, you can then send me this
154 file and the hddtemp binary. The backtrace functionality is currently
155 supported on i386 architectures only.
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159 smartctl(8), syslog(3), syslogd(8).
160
163 Emmanuel Varagnat (hddtemp@guzu.net).
164 This manual page was originaly written by Aurelien Jarno
166 <aurel32@debian.org>, for the Debian GNU/Linux system (but may be used
167 by others).
168 July 21, 2003 HDDTEMP(8)