[rrd-users] Problem with RRDs::graph in Perl script

[Dmitry V. Kolvakh]

Hello rrd-users,

  I'm using MRTG with RRDTool and slightly modified mrtg-rrd.cgi
  (http://www.fi.muni.cz/~kas/mrtg-rrd/) generates output.
  The problem has appeared after upgrading from RRDTool 1.0.49 to
  RRDTool 1.2.9 (and still remains with 1.2.11).
  Now the system has theese components:
  MRTG 2.12.1
  perl v5.8.6
  FreeBSD

  and can be seen at http://serv4.pstu.ru/~keu/cgi-bin/mrtg-rrd.cgi/

  In mostly times (about 95%) there is no average, max and current
  values printed under the graphs. I've tried to find the problem and
  have found the following: RRDs::graph returns a pointer to an _empty_
  array as a first element of returning array.
  E.g.:
     my @rv = RRDs::graph(....);
  and @{$rv[0]} is an empty array.

  The some parameters of RRDs::graph follows:
  =========cut==========
DEF:in0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds0:AVERAGE
CDEF:in=in0,8,*
DEF:maxin0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds0:MAX
CDEF:maxin=maxin0,8,*
DEF:out0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds1:AVERAGE
CDEF:out=out0,8,*
DEF:maxout0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds1:MAX
CDEF:maxout=maxout0,8,*
PRINT:out:MAX:%.1lf
PRINT:in:MAX:%.1lf
PRINT:out:AVERAGE:%.1lf
PRINT:in:AVERAGE:%.1lf
PRINT:out:LAST:%.1lf
PRINT:in:LAST:%.1lf
  =========cut==========
I've tried to avoid deprecate functions and changed the parameters to
a new style:
  =========cut==========
DEF:in0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds0:AVERAGE
CDEF:in=in0,8,*
DEF:maxin0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds0:MAX
CDEF:maxin=maxin0,8,*
DEF:out0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds1:AVERAGE
CDEF:out=out0,8,*
DEF:maxout0=/home/keu/mrtg/data/cisco7.ccl.ru/cisco7.ccl.ru_1.rrd:ds1:MAX
CDEF:maxout=maxout0,8,*
VDEF:out_max=out,MAXIMUM
PRINT:out_max:%.1lf
VDEF:in_max=in,MAXIMUM
PRINT:in_max:%.1lf
VDEF:out_avg=out,AVERAGE
PRINT:out_avg:%.1lf
VDEF:in_avg=in,AVERAGE
PRINT:in_avg:%.1lf
VDEF:out_lst=out,LAST
PRINT:out_lst:%.1lf
VDEF:in_lst=in,LAST
PRINT:in_lst:%.1lf
  =========cut==========

  but nothing have changed.

  The most interesting is that sometimes (rarely) it works, and max,
  average and last values are calculated!

-- 
Best regards,
 Dmitry                          mailto:k_e_u at bk.ru

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