[rrd-users] RRDs::update failure to insert values into rrd

[George Mtonga]

I getting blank graphs and I think the following module does not do
its work properly as the size of file eth0.rrd remains constant no how
many times the script is run.

 RRDs::update "$rrd/$_[0].rrd",
                "-t", "in:out",
                "N:$in:$out";

Is there a way of checking if the module works fine?