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rrdinfo

Name
     rrdinfo - extract header information from an RRD

Synopsis
     rrdtool info filename [--daemon|-d address [--noflush|-F]]

Description
     The info function prints the header information from an RRD
     in a parsing friendly format.

     Check rrdcreate if you are uncertain about the meaning of
     the individual keys.

     filename
             The name of the RRD you want to examine.

     --daemon|-d address
             Address of the rrdcached daemon. If specified, a
             "flush" command is sent to the server before reading
             the RRD files. This allows rrdtool to return fresh
             data even if the daemon is configured to cache
             values for a long time.  For a list of accepted
             formats, see the -l option in the rrdcached manual.

              rrdtool info --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd

     --noflush|-F
             Omit the "flush" command usually sent to the daemon
             prior to retrieving the data.  If all you are
             interested in the the RRD Structure, and not the
             last update time or current values, then this will
             improve efficiency.

Example
     This is the output generated by running info on a simple RRD
     which contains two data sources and one RRA. Note that the
     number after the last_update keyword is in seconds since
     1970. The string NaN stands for *UNKNOWN* data. In the
     example it means that this RRD has neither minimum nor
     maximum values defined for either of its data sources.

      filename = "random.rrd"
      rrd_version = "0001"
      step = 300
      last_update = 955892996
      header_size = 2872
      ds[a].type = "GAUGE"
      ds[a].minimal_heartbeat = 600
      ds[a].min = NaN
      ds[a].max = NaN
      ds[a].last_ds = "UNKN"
      ds[a].value = 2.1824421548e+04
      ds[a].unknown_sec = 0
      ds[b].type = "GAUGE"
      ds[b].minimal_heartbeat = 600
      ds[b].min = NaN
      ds[b].max = NaN
      ds[b].last_ds = "UNKN"
      ds[b].value = 3.9620838224e+03
      ds[b].unknown_sec = 0
      rra[0].cf = "AVERAGE"
      rra[0].pdp_per_row = 1
      rra[0].cdp_prep[0].value = nan
      rra[0].cdp_prep[0].unknown_datapoints = 0
      rra[0].cdp_prep[1].value = nan
      rra[0].cdp_prep[1].unknown_datapoints = 0

Environment Variables
     The following environment variables may be used to change
     the behavior of "rrdtool info":

     RRDCACHED_ADDRESS
         If this environment variable is set it will have the
         same effect as specifying the "--daemon" option on the
         command line. If both are present, the command line
         argument takes precedence.

Author
     Tobias Oetiker <tobi@oetiker.ch>
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