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           /usr/lib/sysstat/sadc  [ -C comment ] [ -S { INT | DISK | SNMP | IPV6 |
           POWER | XDISK | ALL | XALL } ] [ -F ] [ -L ] [ -V ] [ interval [  count
           ] ] [ outfile ]


           The  sadc  command  samples  system  data  a  specified number of times
           (count) at a specified interval  measured  in  seconds  (interval).  It
           writes in binary format to the specified outfile or to standard output.
           If outfile is set to -, then sadc uses  the  standard  system  activity
           daily data file, the /var/log/sysstat/sadd file, where the dd parameter
           indicates the current day.  By  default  sadc  collects  all  the  data
           available  from  the  kernel.  Exceptions are interrupts and disk data,
           for which the relevant options must be explicitly passed to  sadc  (see
           options below).
           When  the  count  parameter is not specified, sadc writes its data end-
           lessly.  When both interval and count are not specified, and option  -C
           is  not  used,  a dummy record, which is used at system startup to mark
           the time when the counter restarts from 0, will be written.  For  exam-
           ple, one of the system startup script may write the restart mark to the
           daily data file by the command entry:
           /usr/lib/sysstat/sadc -
           The sadc command is intended to be used as a backend to  the  sar  com-
           Note: The sadc command only reports on local activities.


           -C comment
                  When  neither  the  interval nor the count parameters are speci-
                  fied, this option tells sadc to write a dummy record  containing
                  the  specified  comment  string.   This comment can then be dis-
                  played with option -C of sar.
           -F     The creation of outfile will be  forced.  If  the  file  already
                  exists  and  has  a format unknown to sadc then it will be trun-
                  cated. This may be useful for daily data  files  created  by  an
                  older  version  of sadc and whose format is no longer compatible
                  with current one.
           -L     sadc will try to get an exclusive lock  on  the  outfile  before
                  writing  to  it  or  truncating  it.  Failure to get the lock is
                  fatal, except in the case of trying to write a normal (i.e.  not
                  a  dummy  and not a header) record to an existing file, in which
                  case sadc will try again at the next interval. Usually, the only
                  reason  a  lock would fail would be if another sadc process were
                  also writing to the file. This can happen when cron is  used  to
                  launch  sadc.   If  the  system is under heavy load, an old sadc
                  therefore all previous activities are collected.
                  The  XDISK keyword is an extension to the DISK one and indicates
                  that partition statistics should be collected by sadc  in  addi-
                  tion  to  disk  statistics.  This option works only with kernels
                  2.6.25 and later.  The XALL keyword is equivalent to  specifying
                  all the keywords above (including keyword extensions) and there-
                  fore all possible activities are collected.
                  Important note: The activities (including optional  ones)  saved
                  in an existing data file prevail over those selected with option
                  -S.  As a consequence, appending data to an existing  data  file
                  will result in option -S being ignored.
           -V     Print version number then exit.


           The sadc command takes into account the following environment variable:
                  If this variable exists and its value is UTC then sadc will save
                  its  data  in  UTC time.  sadc will also use UTC time instead of
                  local time to determine the current daily data file  located  in
                  the /var/log/sysstat directory.


           /usr/lib/sysstat/sadc 1 10 /tmp/datafile
                  Write  10  records  of one second intervals to the /tmp/datafile
                  binary file.
           /usr/lib/sysstat/sadc -C Backup_Start /tmp/datafile
                  Insert the comment Backup_Start into the file /tmp/datafile.


           The /proc filesystem must be mounted for the sadc command to work.
           All the statistics are not necessarily available, depending on the ker-
           nel  version used.  sadc assumes that you are using at least a 2.6 ker-


                  Indicate the daily data file, where the dd parameter is a number
                  representing the day of the month.
           /proc contains various files with system statistics.


           Sebastien Godard (sysstat <at>

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