X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=doc%2Frrd-beginners.pod;h=c3d0a397155a5dd7a698f81377d7fcc8bc7bb8c0;hb=cffc3b561fbc7bafbde87b10edf18013df3da531;hp=37145e65f171cca2ae980db7057809c1ece6ff5a;hpb=7f4b880d9d5c7a48e273f52e8dfa54fae39006e3;p=rrdtool.git diff --git a/doc/rrd-beginners.pod b/doc/rrd-beginners.pod index 37145e6..c3d0a39 100644 --- a/doc/rrd-beginners.pod +++ b/doc/rrd-beginners.pod @@ -1,4 +1,4 @@ -=head1 NAME +=head1 NAME rrd-beginners - RRDtool Beginners' Guide @@ -59,7 +59,7 @@ data flow to update the RRDtool database. RRDtool is designed to store time series of data. With every data update, an assosiated time stamp is stored. Time is always expressed -in seconds passed since epoch (01-01-1971). RRDtool can be installed +in seconds passed since epoch (01-01-1970). RRDtool can be installed on Unix as well as Windows. It comes with a command set to carry out various operations on RRD databases. This command set can be accessed from the command line, as well as from Shell or Perl scripts. The @@ -135,9 +135,9 @@ explained better with the following example: Values = 300, 600, 900, 1200 Step = 300 seconds - COUNTER DS = 1, 1, 1, 1 + COUNTER DS = 1, 1, 1, 1 DERIVE DS = 1, 1, 1, 1 - ABSOLUTE DS = 1, 2, 3, 4 + ABSOLUTE DS = 1, 2, 3, 4 GAUGE DS = 300, 600, 900, 1200 The next parameter is B. In our example, heartbeat is 600 @@ -251,7 +251,7 @@ generation is done using Perl scripts. These scripts are shown below: =head3 Perl script (retrieves data from database and generates graphs and statistics) #!/usr/bin/perl -w - # This script fetches data from target.rrd, creates a graph of memory + # This script fetches data from target.rrd, creates a graph of memory # consumption on the target (Dual P3 Processor 1 GHz, 656 MB RAM) # call the RRD perl module @@ -262,8 +262,8 @@ generation is done using Perl scripts. These scripts are shown below: my $start_time = $end_time - 2592000; # set start 30 days in the past # fetch average values from the RRD database between start and end time - my ($start,$step,$ds_names,$data) = - RRDs::fetch("target.rrd", "AVERAGE", + my ($start,$step,$ds_names,$data) = + RRDs::fetch("target.rrd", "AVERAGE", "-r", "600", "-s", "$start_time", "-e", "$end_time"); # save fetched values in a 2-dimensional array my $rows = 0;