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 is 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>