HDDTEMP(8)                                                    System Manager's Manual                                                   HDDTEMP(8)

NAME

       hddtemp - Utility to monitor hard drive temperature

SYNOPSIS

       hddtemp [options] [type:]disk...

DESCRIPTION

       hddtemp  will give you the temperature of your hard drive by reading Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)  infor-
       mation on drives that support this feature.  Only modern hard drives have  a  temperature  sensor.   hddtemp  supports  reading  S.M.A.R.T.
       information from SCSI drives too.  hddtemp can work as simple command line tool or as a daemon.

       You can specify one or more device drive path, where each path can be prefixed with a type like PATA, SATA or SCSI to force hddtemp too use
       one of these type (because detection can fail).

OPTIONS

       The program follows the usual GNU command line syntax, with long options starting with two dashes (`-').  A summary of options is  included
       below.

       -b, --drivebase
              Display the database file that allows hddtemp to recognize a supported drive.

       -D, --debug
              Display various S.M.A.R.T. fields and their values.  Useful for finding a value that seems to match the temperature and/or to send a
              report.  (done for every drive supplied)

       -d, --daemon
              Execute hddtemp in TCP/IP daemon mode (port 7634 by default).

       -f, --file=file
              Specify the database file to use.

       -F, --foreground
              Don't fork into the background even in daemon mode.  This is useful when running under a process supervisor.

       -l, --listen=addr
              Listen on a specific address.  addr is a string containing a host name or a numeric host address string.  The numeric  host  address
              string is a dotted-decimal IPv4 address or an IPv6 hex address.

       -n, --numeric
              Print only the temperature (without the unit).

       -p, --port=#
              Port number to listen to (in TCP/IP daemon mode).

       -s, --separator=char
              Separator to use between fields (in TCP/IP daemon mode).  The default separator is `|'.

       -S, --syslog=s
              Switch to daemon mode and log temperatures to syslog every s seconds.

       -q, --quiet
              Don't check if the drive is supported.

       -u, --unit=C|F
              Force output temperature either in Celsius or Fahrenheit.

       -v, --version
              Display hddtemp version number.

       -w, --wake-up
              Wake-up the drive if needed (ATA drives only).

       -4     Listen on IPv4 sockets only.

       -6     Listen on IPv6 sockets only.

DRIVE DATABASE

       If  you  know  your  drive has a temperature sensor but it is being reported unsupported, tell me which model and which manufacturer it is,
       and/or just add a new entry in /etc/hddtemp.db.  Each line of hddtemp.db is either a comment, a blank line or a line containing:

       - a regular expression that allow hddtemp to recognize a drive or a
              set of drives from its model name or from a generic model name,

       - a value (ATTRIBUTE_ID from S.M.A.R.T.),

       - a C or an F to set the unit to Celsius or Fahrenheit,

       - a description.

       Feedback is welcome (see the REPORT section below).

TCP
/IP DAEMON MODE
       Example of type forcing:

       # hddtemp SATA:/dev/sda PATA:/dev/hda

       To test hddtemp in daemon mode, start it like this:

       # hddtemp -d /dev/hd[abcd]

       and use telnet or netcat (which is known as nc on some systems) to get a reply:

       # netcat localhost 7634

       The drive database is read only once at startup, so hddtemp must be restarted if the database is updated for the changes to take effect.

REPORT

       As I receive a lot of reports, things must be clarified.  When running hddtemp with debug options, hddtemp will show  sort  of  a  dump  of
       S.M.A.R.T. data.  Each field corresponds to an information field.  The standard field for drive temperature is 194.  But this is not always
       the case (mostly for older drives).  Even if your drive has S.M.A.R.T. capabilities, it doesn't necessarily mean that  it  can  report  its
       temperature.  So, things must be determined through experimentation.

       So, you can try to guess which field by is the good one by running hddtemp at regular intervals:

        - just after starting up your PC/server/station,

        - after opening a window (a physical window :),

        - after opening the case,

        - whatever you can think of...

       and  looking for a field's value that would increase or decrease depending on what effect you want to induce.  Be careful, fields 4, 9, and
       12 are often reported to match a temperature field but after some investigation they do not.  But fields 194 (which is the  standard  field
       for temperature) and 231 are good candidates.

       Then,  you  can  send me a report with outputs from `hddtemp --debug ...', `smartctl' or `hdparm -i ...', and/or add an entry in hddtemp.db
       yourself.

BUGS

       If hddtemp crashes (yes, it might) for some unknown reasons, look for a file named hddtemp.backtrace.<PID>.XXXXXX (where XXXXXX is a random
       number  generated  at  runtime) in /tmp.  Then, you can then send me this file and the hddtemp binary.  The backtrace functionality is cur-
       rently supported on i386 architectures only.

SEE ALSO

       smartctl(8), syslog(3), syslogd(8).

AUTHOR

       Emmanuel Varagnat (hddtemp@guzu.net).

       This manual page was originally written by Aurelien Jarno <aurel32@debian.org>, for the Debian GNU/Linux system (but may be  used  by  oth-
       ers).

                                                                   July 21, 2003                                                        HDDTEMP(8)