misc fixed and TREND and reduce functionality by

[rrdtool.git] / doc / rrdgraph_data.src

diff --git a/doc/rrdgraph_data.src b/doc/rrdgraph_data.src
index 9b9ec8a..1f8fcb7 100644 (file)
--- a/doc/rrdgraph_data.src
+++ b/doc/rrdgraph_data.src
@@ -1,8 +1,8 @@
 =include name
 
 =include name
 

-=head1 SYNOPSYS
+=head1 SYNOPSIS

 
 

-B<DEF>:I<vname>=I<RRD file>:I<ds name>:I<CF>[:step=I<step size>][:<time range>>]
+B<DEF:>I<E<lt>vnameE<gt>>=I<E<lt>rrdfileE<gt>>:I<E<lt>ds-nameE<gt>>:I<E<lt>CFE<gt>>[:step=I<E<lt>stepE<gt>>][:start=I<E<lt>timeE<gt>>][:end=I<E<lt>timeE<gt>>][:reduce=I<E<lt>B<CF>E<gt>>]

 
 B<VDEF>:I<vname>=I<RPN expression>
 
 
 B<VDEF>:I<vname>=I<RPN expression>
 


@@ -13,22 +13,22 @@ B<CDEF>:I<vname>=I<RPN expression>
 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
 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
+such as maximum, minimum etcetera. Two of the instructions use

 a language called B<RPN> which is described in its own manual page.
 
 =head1 DEF
 
 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>[:step=I<step size>][:<time range>>]
+B<DEF:>I<E<lt>vnameE<gt>>=I<E<lt>rrdfileE<gt>>:I<E<lt>ds-nameE<gt>>:I<E<lt>CFE<gt>>[:step=I<E<lt>stepE<gt>>][:start=I<E<lt>timeE<gt>>][:end=I<E<lt>timeE<gt>>][:reduce=I<E<lt>B<CF>E<gt>>]

 
 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
 
 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. 
-The resolution can again 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>. ]
+be overridden with the L<--step|rrdgraph/item_Time> option. 
+The resolution can again be overridden by specifying the B<step size>.
+The time span of this data is the same as for the graph by default,
+you can override this by specifying B<start and end>.  Remember to
+escape colons in the time specification!

 
 If the resolution of the data is higher than the resolution of off
 graph, the data will be further consolidated.  This may result in
 
 If the resolution of the data is higher than the resolution of off
 graph, the data will be further consolidated.  This may result in


@@ -39,10 +39,17 @@ 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>).
 
 image with width 400 and time span 400*1800 seconds (use appropriate
 start and end times, such as C<--start end-8days8hours>).
 

+If consolidation needs to be done, the B<CF> of the B<RRA> specified in the
+B<DEF> itself will be used to reduce the data density.  This behaviour can
+be changed using C<:reduce=I<E<lt>B<CF>E<gt>>>.  This optional parameter
+specifies the B<CF> to use during the data reduction phase.
+

 Example:
 
         DEF:ds0=router.rrd:ds0:AVERAGE
         DEF:ds0weekly=router.rrd:ds0:AVERAGE:step=7200
 Example:
 
         DEF:ds0=router.rrd:ds0:AVERAGE
         DEF:ds0weekly=router.rrd:ds0:AVERAGE:step=7200

+        DEF:ds0weekly=router.rrd:ds0:AVERAGE:start=end-1h
+        DEF:ds0weekly=router.rrd:ds0:AVERAGE:start=11\:00:end=start+1h

 
 =head1 VDEF
 
 
 =head1 VDEF