+++ /dev/null
-=head1 NAME
-
-rrdtool graph - Round Robin Database tool grapher functions
-
-WARNING: This is for version 1.1.x which is B<I<BETA>> software.
-The software may contain serious bugs. Some of the items
-described in here may not yet exist (although this should
-be mentioned) or still be in the alpha stage. As with every
-other RRDtool release: use at your own risk. In contrast with
-the stable version of RRDtool, this release may contain bugs
-known to the authors. It is highly recommended that you subscribe
-to the mailing list.
-
-=head1 SYNOPSYS
-
-B<DEF>:I<vname>=I<RRD file>:I<ds name>:I<CF>[:[I<time range>][:I<step size>]]
-
-B<VDEF>:I<vname>=I<RPN expression>
-
-B<CDEF>:I<vname>=I<RPN expression>
-
-=head1 DESCRIPTION
-
-These three instructions collect the data out of the B<RRD> files,
-optionally altering it (think of a bytes to bits conversion) and
-if desired you can define variables containing useful information
-such as maximum, mininimum etcetera. Two of the instructions use
-a language called B<RPN> which is described in its own manual page.
-
-=head1 DEF
-
-B<DEF>:I<vname>=I<RRD file>:I<ds name>:I<CF>[:[I<time range>][:I<step size>]]
-
-This command fetches data from an B<RRD> file. The virtual name
-I<vname> can then be used throughout the rest of the script. By
-default, an B<RRA> which contains the correct consolidated data
-at an appropriate resolution will be chosen. The resolution can
-be overriden with the L<--step|rrdgraph/item_Time> option.
-I<Not yet implemented:>[ The resolution can be overriden by specifying
-the B<step size>.] I<Not yet implemented:> [ The time span of this data
-is the same as for the graph by default, you can override this by
-specifying the B<time range>. ]
-
-If the resolution of the data is higher than the resolution of off
-graph, the data will be further consolidated. This may result in
-a graph that spans slightly more time than requested.
-Ideally each point in the graph should correspond with one B<CDP>
-from an B<RRA>. For instance, if your B<RRD> has an B<RRA> with
-a resolution of 1800 seconds per B<CDP>, you should create an
-image with width 400 and time span 400*1800 seconds (use appropriate
-start and end times, such as C<--start end-8days8hours>).
-
-Example: C<DEF:mydata=router.rrd:ds0:AVERAGE>
-
-Example: C<DEF:januari=router.rrd:ds0:AVERAGE:start=20010101 end=20010201>
-
-=head1 VDEF
-
-B<VDEF>:I<vname>=I<RPN expression>
-
-This command returns a value and/or a time according to the B<RPN>
-statements used. The resulting I<vname> will, depending on the
-functions used, have a value and a time component. When you use
-this I<vname> in another B<RPN> expression, you are effectively
-inserting its value just as if you had put a number at that place.
-The variable can also be used in the various graph and print
-elements. I<Not yet implemented:> [ Everywhere you can insert a
-number, you can also use the B<VDEF> (provided that it is set of course) ]
-
-Example: C<VDEF:avg=mydata,AVERAGE>
-
-=head1 CDEF
-
-B<CDEF>:I<vname>=I<RPN expression>
-
-This command creates a new set of data points (in memory only, not
-in the B<RRD> file) out of one or more other data series. The B<RPN>
-instructions are used to evaluate a mathematical function on each
-data point. The resulting I<vname> can then be used further on in
-the script, just as if it were generated by a B<DEF> instruction.
-
-Example: C<CDEF:mydatabits=mydata,8,*>
-
-=head1 SEE ALSO
-
-L<rrdgraph> gives an overview of how B<rrdtool graph> works.
-L<rrdgraph_data> describes B<DEF>,B<CDEF> and B<VDEF> in detail,
-L<rrdgraph_rpn> describes the B<RPN> language used in the B<?DEF> statements,
-L<rrdgraph_graph> page describes all of the graph and print functions.
-
-Make sure to read L<rrdgraph_examples> for tipsE<amp>tricks.
-
-=head1 AUTHOR
-
-Program by Tobias Oetiker E<lt>oetiker@ee.ethz.chE<gt>
-
-This manual page by Alex van den Bogaerdt E<lt>alex@ergens.op.het.netE<gt>
projects / rrdtool.git / blobdiff